(19)
(11)EP 3 172 797 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
24.06.2020 Bulletin 2020/26

(21)Application number: 14799215.0

(22)Date of filing:  03.11.2014
(51)International Patent Classification (IPC): 
H01Q 13/16(2006.01)
H01Q 21/24(2006.01)
H01Q 21/06(2006.01)
(86)International application number:
PCT/IB2014/065773
(87)International publication number:
WO 2016/012845 (28.01.2016 Gazette  2016/04)

(54)

SLOT ANTENNA

SCHLITZANTENNE

ANTENNE À FENTES


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 21.07.2014 US 201462026811 P

(43)Date of publication of application:
31.05.2017 Bulletin 2017/22

(73)Proprietor: Telefonaktiebolaget LM Ericsson (publ)
164 83 Stockholm (SE)

(72)Inventors:
  • WIGHT, Jim
    Ottawa, Ontario K1S 3M6 (CA)
  • FRANK, Peter
    Carp, Ontario K0A 1L0 (CA)
  • SMITH, Roland
    Nepean, Ontario K2J 0E1 (CA)
  • SKOF, Mike
    Nepean, Ontario K2J 3Y7 (CA)

(74)Representative: Zacco Sweden AB 
Valhallavägen 117 Box 5581
114 85 Stockholm
114 85 Stockholm (SE)


(56)References cited: : 
EP-A1- 1 950 831
US-A1- 2002 175 874
US-A1- 2014 022 131
US-B1- 7 358 912
CN-U- 201 966 324
US-A1- 2009 153 423
US-A1- 2014 071 009
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Field of the Disclosure



    [0001] The present invention relates to antennas and more particularly to slot antennas.

    Background



    [0002] Currently known low cost antennas include planar inverted "F" or "L" antennas (PIFA or PILA). The size of these antennas scales inversely with frequency, thus, at certain frequencies, such as 2.4 GHz used for Wi-Fi, PIFA and PILA antennas can be quite large.

    [0003] Printed circuit board (PCB) antennas (including dipoles and monopoles) are also often used. However, they too scale inversely with frequency. Therefore, at certain frequencies, such as 2.4 GHz, they also can be quite large.

    [0004] As radio products, including access points, reduce in size, the use of low cost bent metal PIFA and PILA antennas becomes a limiting factor affecting product dimensions. If PCB antennas are used, a small size requires high dielectric constant materials, increasing the overall cost of the product.

    [0005] Typical slot antennas may be low cost, however, they can also be larger than it would be desirable for today's radio products.

    [0006] CN 201 966 324 U discloses a radio frequency identification double-frequency tag antenna which comprises a substrate and a metal layer covering the substrate. The metal layer has an etched gap structure which comprises a horizontal gap and a plurality of vertical gaps arranged on two sides of the horizontal gap, the etched gap structure forming a micro-strip comb gap structure.

    [0007] US 2014/0071009 A1 discloses a dual-band antenna with a rectangular metal plane which includes a slot structure extending from a first side to a second side of the rectangular metal plane, a feeding terminal formed on the rectangular metal plane, and a grounding element for electrically connecting the rectangular metal plane and a system ground. In an embodiment, the slot structure comprises an extending slot and an L-shaped slot at the ends of a rectangular slot section of the slot structure.

    [0008] EP 1 950 831 A1 relates to a dipole array directional antenna.

    [0009] US 2002/0175874 A1 shows a fractal cross slot antenna with a radiating fractal cross slot layer. The radiating fractal cross slot layer has a plurality of antenna elements, wherein each antenna element is formed by a meandering slot. The fractal

    [0010] cross slot antenna also comprises a ground plane layer which is separated from the radiating fractal cross slot layer by a spacer layer.

    [0011] US 7,358,912 B1 shows an antenna apparatus with a plurality of antenna elements including a plurality of dipoles and/or a plurality of slot antennas.

    [0012] US 2014/0022131 A1 discloses a broadbsand dual-polarized antenna with a vertically polarized monopole radiating element and a plurality of horizontally polarized radiating elements.

    [0013] US 2009/0153423 A1 discloses a wireless communication device with a multi-band antenna system. The multi-band antenna system comprises a printed circuit board with a feeding contact, a conductor that extends completely out of a PCB ground, wherein the conductor has no ground contact with the PCB ground. The conductor has an enclosed slot and is fed with signals using a feed line which is coupling the conductor to the feeding contact.

    [0014] A low cost small size antenna to overcome the problems of the prior art is therefore required.

    Summary



    [0015] The invention is defined by the independent claims. Furthermore, the embodiments of the invention are those defined by the claims. Moreover, examples, aspects and embodiments, which are not covered by the claims are presented not as embodiments of the invention, but as background art or examples useful for understanding the invention.

    [0016] Slot antennas that allow for a size reduction of the physical size of the antenna at a frequency of operation, compared to the physical size of a simple slot antenna at the same frequency of operation, are provided. Such antennas are referred herein as slotted slot antennas or toothed antennas.

    [0017] According to a first embodiment, a slot antenna comprises the features of claim 1. The slot antenna has a reduced physical length compared to the length of a typical slot antenna at the same frequency of operation.

    [0018] According to a second embodiment, an electronic device comprising a ground plane and a slot antenna according to the first embodiment is provided. The slot antenna is mounted on the ground plane.

    [0019] According to a third embodiment an electronic device comprising a ground plane and a plurality of slot antennas according to the first embodiment is provided. The slot antennas are mounted on the ground plane.

    [0020] Other embodiments of slotted slot antennas disclosed herein provide further size reductions while maintaining good gain and return loss. The slotted slot antenna is suitable for use in small form factor or ultra-compact Wi-Fi radios.

    [0021] According to particular embodiments, significant size reduction of the antenna, both in length and height (or width) may be achieved. The reduced size of the slotted slot antenna enables smaller radio products to be developed. The proposed antennas may also be tooled using tin as a low cost metal for the antenna.

    [0022] According to particular embodiments, a slotted slot antenna includes one or more feed points to attach respective RF cables. According to other embodiments, a slotted slot antenna includes one or more feed points adapted to directly mount the antenna to a printed circuit board (PCB) without the use of intermediate RF cables.

    [0023] The slotted slot antenna according to embodiments of the present disclosure may be realized as a vertically polarized or horizontally polarized antenna, and may therefore be used to provide polarization diversity, which is useful for Multiple Input Multiple Output (MIMO) operation.

    [0024] Furthermore, an electronic device comprising one or more slotted slot antennas according to embodiments of the present disclosure may have a well-defined vertical polarization, which is useful for ceiling mounting. For example, an ultra-compact Wi-Fi radio may employ four slotted slot vertically polarized antennas, fed by RF cables.

    Brief Description of the Drawing Figures



    [0025] The accompanying drawing figures incorporated in and forming a part of this specification illustrate several aspects of the disclosure, and together with the description serve to explain the principles of the disclosure.

    Figures 1A and 1B illustrate a prior art slot antenna and a prior art metal dipole antenna, respectively;

    Figures 2A and 2B illustrate a prior art bent slot antenna and a prior art bent metal dipole antenna, respectively;

    Figure 3 illustrates a top view of a slot antenna according to an example of the present disclosure;

    Figures 4A, 4B, 5A, 5B, 6A, 6B, 7 and 8 illustrate slot antennas according to various examples of the present disclosure;

    Figures 9A-9B illustrates dimensions of a slotted slot antenna according to an example of the present disclosure;

    Figure 10 illustrates an electronic device comprising slotted slot antennas according to an example of the present disclosure;

    Figures 11A, 11B and 11C illustrate an electronic device comprising slotted slot antennas according to another example of the present disclosure;

    Figures 12-14 illustrate simulation results associated with the example in Figures 11A-11C;

    Figures 15 and 16 illustrate an electronic device comprising slotted slot antennas according to another example of the present disclosure;

    Figures 17, 18A, 18B and 19 illustrate simulation results associated with the example in Figure 11.


    Detailed Description



    [0026] The embodiments set forth below represent information to enable those skilled in the art to practice the embodiments and illustrate the best mode of practicing the embodiments. Upon reading the following description in light of the accompanying drawing figures, those skilled in the art will understand the concepts of the disclosure and will recognize applications of these concepts not particularly addressed herein. It should be understood that these concepts and applications fall within the scope of the disclosure and the accompanying claims.

    [0027] Typically, a metallic antenna comprises of an arrangement of conductors, electrically connected to the receiver or transmitter. An oscillating current of electrons forced through the antenna by a transmitter via a feed point creates an oscillating magnetic field around the antenna elements. At the same time, the charge of the electrons also creates an oscillating electric field along the elements. These time-varying fields radiate away from the antenna into space as a moving transverse electromagnetic field wave. Conversely, during reception, the oscillating electric and magnetic fields of an incoming radio wave exert force on the electrons in the antenna elements. This force causes the electrons to move back and forth, creating oscillating currents in the antenna, which are collected via a feed point. These currents are fed to a receiver to be amplified.

    [0028] The present disclosure pertains to slot antennas. For ease of understanding, a typical slot antenna as known in the art will be referred herein as a simple slot antenna. Furthermore, while some of the description below is provided in reference to transmitting antennas, a person skilled in the art would readily understand the described concepts as applicable to receiving antennas.

    [0029] Figures 1A and 1B illustrate a prior art slot antenna 10 (referred herein as a 'simple slot antenna') and a prior art metal dipole antenna 20, respectively. The simple slot antenna 10 comprises a conductor 12, an elongated hole or slot 14 cut out within the conductor 12 and a feed point 16. Similarly, the metal dipole antenna 20 comprises two metal conductors 21, 22 of equal lengths and a feed point 26.

    [0030] In operation, oscillating currents are respectively provided to the simple slot antenna 10 and metal dipole antenna 20 through feed points 16, 26. The means of resonance are different in the metal dipole antenna 20 compared to a simple slot antenna 10. In the case of the metal dipole antenna 20, the feed point 26 is between the metal conductors 21, 22 and the electromagnetic field wave travels along the metal conductors 21, 22. In the case of the simple slot antenna 10, the feed point 16 is across the slot 14. This forces the electromagnetic wave to travel across the slot 14. More specifically, the current travels around the slot 14 and the voltage across the slot 14. So, in the metal dipole antenna 20, the metal conductors 21, 22 form the radiating element, whereas in a slot antenna 10, the slot 14 is the radiating element. In Figures 1A and 1B, the arrows indicate the magnitude and direction of a standing wave created in each case. In both figures, the same patterns hold true: the closer to the feed point, the greater the magnitude of the created standing wave and the closer to the end of the element, the smaller the magnitude of the created standing wave. If the length of the slot 14 and of the metal conductor 22 is nominally λ/2, the two antennas resonate at a frequency f=v/A, where v is the velocity of the electromagnetic wave. Therefore, the length of the slot 14 and of the metal conductor 22 set the resonant frequency (or nominal operating frequency), while the majority of the radiation comes from the region where the current flow is greatest.

    [0031] In view of the above, by bending lengthwise the ends of slot antennas 10 and 20, to arrive at slot antenna 10' and metal dipole antenna 20', as shown in Figures 2A and 2B, the desired frequency is maintained and only a small part of the radiation power is sacrificed. The radiating element in each case, namely slot 14' for antenna 10', and conductors 21' and 22' for antenna 20', is still λ/2, so as to resonate at f=v/A, but the change to the original pattern is very small because only the tips of the antennas 10 and 20 have been bent, and this only affects the smallest currents.

    [0032] Slotted slot antennas that allow for a size reduction of the physical size of the antenna at a frequency of operation, compared to the physical size of a simple slot antenna at the same frequency of operation, are provided.

    [0033] Figure 3 illustrates a top view of a slot antenna 30 according to an example of the present disclosure. Generally, slot antenna 30 may be used for transmitting or receiving frequencies within a bandwidth around a nominal operating frequency. Similarly to the simple slot antenna of Figure 1A, slot antenna 30 comprises a conductor 32, a principal slot 34, and a feed point 36. However, in comparison to the simple slot antenna 10, the slot antenna 30 further comprises one or more side slots 37, also referred herein as secondary slots. The conductor 32 has an axis 33 defining a first conductor side 32-A and a second conductor side 32-B. The principal slot 34 extends longitudinally within the conductor along the axis 33. The feed point 36 (which may also be referred to as a feed port) comprises a first coupling point 36-A and a second coupling point 36-B respectively located on the first and second conductor sides, 32A, 32-B. The one or more side slots 37 extend from the principal slot 34, into conductor 32. Due to the presence of one or more side slots 37, slot antenna 30 and any equivalents are also further referred herein as 'slotted slot antennas' or 'toothed antennas'.

    [0034] In operation, feed point 36 allows coupling of an oscillating current to the slot antenna 30, via the two coupling points 36-A, 36B. In operation, the one or more secondary slots 37 provide inductive and/or capacitive loading of the electromagnetic wave, causing it to slow down as it travels along the principal slot 34. Accordingly, the velocity of the wave and, therefore, the frequency of resonance, are reduced. Thus, for radiating at the same frequency, the length of slot antenna 30 may be shorter than the length of the simple slot antenna 10 in Figure 1A.

    [0035] Various configurations of side slots 37 in terms of their overall number, shapes, locations relative to the principal slot 34, their respective lengths and widths, may be suitable. According to one example the length of all side slots 37 corresponds to a quarter wavelength of the nominal operating frequency, i.e. λ/4, and the width of all side slots corresponds to a tenth of the nominal operating frequency, i.e. λ/10. In other examples, the length of some or all of the side slots correspond to an integer multiple of the nominal operating frequency, i.e. nλ/4, where n is a positive odd integer. Various reduction factors for the length of the slot antenna 30 may thus be achieved with such configurations.

    [0036] The side slots 37 may extend from the principal slot 34 into only one or into both conductor sides 32-A, 32-B. The side slots 37 may have simple elongated shapes, or they may be more complex slot shapes, such as fractal type shapes. The side slots 37 may have their own side slots.

    [0037] Figure 3 illustrates side slots 37 as perpendicularly oriented to the direction of of axis 33. However, other orientations may be possible. Such alternate orientations may be at angles other than 90° relative to the direction of the axis 33.

    [0038] Figure 3 also illustrates feed point 36 at half of the length of the principal slot 34. However, alternate feed point locations are possible, along the length of the primary or secondary slots. Also, alternate examples contemplate a plurality of feed points. These could be used, for example, in a balanced feed structure (or "push-pull").

    [0039] The ends (or tips) of the conductor 32 may be bent to further reduce the overall size of slot antenna 34. If either the principal slot 34 and the one or more of the side slots 37 bend with the bending of the end of the conductor, the radiating frequency is not affected.

    [0040] The slotted slot antenna 30 may be realized as a vertically polarized or horizontally polarized antenna. The orientation of the principal slot 34 relative to the ground will indicate the type of polarization. Since, in operation, the electric field is established across the principal slot 34, if the principal slot is parallel to the ground, the slot antenna is vertically polarized. Likewise, if the principal slot is perpendicular to the ground, the slot antenna is horizontally polarized. Using a combination of slotted slot antennas 30 within a radio product may therefore provide polarization diversity, which is useful for MIMO operation. Furthermore, an electronic device comprising one or more slotted slot antennas 30 may achieve a well-defined vertical polarization, which is useful for ceiling mounting.

    [0041] Low cost metal such as tin may be used as the conductor 32 material. This allows for ease of manufacture and decreases the overall cost of the product.

    [0042] Figures 4A, 4B, 5A, 5B, 6A, 6B, 7 and 8 illustrate various variants of slotted slot antenna 30 according to the present disclosure. In these figures, similar numerals are used for similar elements. In particular, antennas 30-1a, 30-1b, 30-2a, 30-2b, 30-3, 30-4 and 30-5 are slotted slot antennas, comprising, each, one principal slot 34, one feed point 36 and a plurality of side slots 37. Various particular features of each of these examples may be combined in other embodiments.

    [0043] In some examples, the conductor 32 is bent to adapt the size of the antenna 30 to fit an available mounting space. In slotted slots antennas 30-1a and 30-1b of Figures 4A and 4B, the ends of the principal slot 34 are bent, by bending the conductor. This allows for a further length reduction of the respective slotted slot antennas. In slotted slots antennas 30-2a, 30-2b, 30-3 and 30-4 of Figures 5A, 5B, 6A, 6B and 7, the ends of the side slots 37 are bent, by bending the conductor. This allows for a width reduction of the respective slotted slot antennas. In some embodiments (not shown), the ends of the principal slot 34 are bent to reduce the length of the slot antenna and the ends of the one or more side slots 37 are bent to reduce the width of the slot antenna. According to disclosed embodiments, the bending of the ends of the principal slot 34 and side slots 37 allows for a reduction of the length and width of the antenna without sacrificing the gain of the antenna. The bending may be in the same direction ("U"-shaped), as in Figures 4A and 5A, in opposing directions ("Z"-shaped), as in Figures 4B, 5B, 6A and 6B or in just one direction (not shown). In alternate embodiments (not shown), bending may follow more complex geometries such as arcs or corners.

    [0044] The side slots 37 may be located on both sides of the principal slot 34 as in Figures 4, 5 and 7 or on only one side of the principal slot 34, as in Figures 6A and 6B. The side slots 37 may have equal lengths and widths or they may have different lengths and widths, as seen in the drawings.

    [0045] In the example illustrated in Figures 6A-6B, conductor 32 is orthogonally bent to the plane of the principal slot 34. This feature allows for easy mounting of the slot antenna 30-4 side onto a flat mounting surface and, in particular, over a ground plane.

    [0046] The feed point 36 may be located along the length of the primary slot 34 as in Figures 4-5, or along the length of side slots 37, as in Figures 6 and 7.

    [0047] The feed point 36 may be adapted to connect to an RF cable. Figures 6A and 6B illustrate two perspective view of a slotted slot antenna 30-5 showing an RF cable 60 attached to the feed point 36. The feed point has a first and second coupling points on opposite sides of the conductor relative to the principal slot 34. The first coupling point is adapted to connect to the ground via coupling means such as a braided sheath within the RF cable 60. The second coupling point is adapted to connect to an RF signal via coupling means such as an alternating current (AC) pin in the RF cable 60.

    [0048] Figure 7 illustrates an example of a slot antenna 30-4 according to the present disclosure in which the feed point 36 may be adapted to be directly connected to a mounting board, such as a printed circuit (PCB) board. Advantageously, this eliminates the need to use an RF cable. Accordingly, such examples may be more reliable and may cost less to implement.

    [0049] A one half slotted slot antenna may be achieved from a half of a slotted slot antenna placed at an angle over a ground plane. The angle may be 90°. Figure 8 illustrates four half slotted slot antenna 30-5 orthogonally placed over an uninterrupted ground plane 50. Each slotted slot antenna 30-5 may be obtained by cutting half of either slotted slot antenna 30-2a or 30-2b, along the length of the principal slot 34. It will be recognized that slotted slot antennas 30-5 may be directly machined as a half slotted slot antenna, rather than being cut from full slotted slot antennas.

    [0050] Not shown, a one half slotted slot antenna may be placed over a second slot in a ground plane at an angle, such as 90°. The second slot may also have side slots in the ground plane. The second slot may also, or alternatively, have its ends bent at right angles (orthogonal) in the plane of the ground plane.

    [0051] Furthermore, in another embodiment, a one half slotted slot antenna comprises a plane conductor placed at an angle, such as 90°, over an elongated principal slot in a ground plane. The principal slot in the ground plane has side slots providing and inductive and/or capacitive loading.

    [0052] In another contemplated slotted slot antenna embodiment, not shown, the conductor is adapted to partially slide within a ground plate.

    [0053] Figures 9A and 9B illustrates dimensions of one slotted slot antenna according to an example of the present disclosure. Figure 9A shows a diagram of a simple slot antenna for a given frequency as 3.556 cm (1.4") wide and 7.874 cm (3.1") long. Figure 9B shows a slotted slot antenna for the same frequency as 3.302 cm (1.3") wide and x 6.096cm (2.4") long. It can be seen that while antenna in Figure 9B is not bent, for the same frequency, a length reduction factor of -0.77 (=2.4/3.1) is achieved only through the addition of side slots.

    [0054] Products may be developed using one or more slotted slot antennas. Figures 10-19 pertain to electronic devices comprising one or more slotted slot antennas, according to embodiments of the present disclosure.

    [0055] According to some embodiments, the plurality of slot antennas may be mounted symmetrically around a central axis orthogonal to the ground plane to allow, during operation of the antenna, a symmetrical far field distribution.

    [0056] Figure 10 illustrates an electronic device 70 combining multiple slotted slot antennas. In particular, assuming a ceiling mounting, four vertically polarized slotted slot antennas 30-2a are arranged around a horizontally polarized slotted slot antenna 30-1a. It will be understood that many other combinations or arrangements of elements are possible.

    [0057] Slotted slot antennas according to some embodiments of the present disclosure are suitable for use in small form factor or ultra-compact Wi-Fi radios. Figures 11A-11C illustrates a Wi-Fi DOT radio 80-1 according to an example of the present disclosure. This ultra-compact Wi-Fi radio employs four slotted slot vertically polarized antennas 30-5, fed by RF cables 52.

    [0058] Figure 12 is a rendering of the emission pattern 90 of the radio of Figures 11A-11C. Figure 13 is a chart illustrating the un-optimized return loss. Figure 14 is a chart illustrating the azimuth far-field pattern.

    [0059] Figure 15 illustrates an electronic device 80-2 according to another example of the present disclosure. The electronic device comprises four slotted slot antennas 30-3 arranged over a circular uninterrupted ground plate 95 such that their principal slots 34 form a square. The four slotted slot antennas are connected to respective RF cables 60 via feed points.

    [0060] Figure 16 illustrates a diagram of the device in Figure 15 indicating the ports P1E, P2, P3 and P4 of the four slotted slot antennas 30-3 in device 80-2. Port P1E is the excitation port for simulation results shown in Figures 17, 18A and 18B and 19. With respect to the diagram in Figure 16, orthogonal x, y z axes are defined as follows: The x -axis is pointing towards port P1E in the plane of the page, the y-axis is pointing towards port P2 in the plane of the page and the z-axis is pointing out of the plane of the paper. An Elevation angle Phi of 0 degrees (see Figure 19) is along the x -axis. The value of the Elevation angle Phi is increasing in the x-y plane, going from the x axis towards the y axis, thus Elevation angle Phi= 90 degrees is along the y axis. In Figures 18A and 18B, the azimuth of 0 degrees is along the horizon and the azimuths of 15 and 30 degrees are 15 and 30 degrees above the horizon, respectively.

    [0061] Figure 17 illustrates the s11 "return loss" parameter for a single antenna 30-3 in Figure 15, with the vertical axis in dB. It can be observed that the antenna is adjusted for ∼2.5GHz. The other parameters (s21, s31, s41) show antenna element-to-element isolation, which is in the range of -15 to -20 dB.

    [0062] Figures 18A and 18B are charts illustrating the azimuth far-field patterns for vertical polarization and horizontal polarization, respectively, for a single antenna 30-3 in Figure 15. Most of the radiated energy is in the vertical polarization and not in the horizontal polarization. Thus, the device 80-2 has a high vertical polarization, useful for ceiling mounting.

    [0063] Figure 19 shows the elevation pattern for a single antenna 30-3 in Figure 15. 0 degrees along the abscissa is pointing straight up into the ceiling, and 180 degrees is pointing straight down. This antenna is an efficient radiator everywhere except straight up into the ceiling.

    [0064] The slot antennas and electronic devices according to embodiments of the present disclosure may be adapted to either one of signal transmission, signal reception or signal transmission and reception.

    [0065] Those skilled in the art will recognize improvements and modifications to the embodiments of the present disclosure. All such improvements and modifications are considered within the scope of the concepts disclosed herein and the claims that follow.


    Claims

    1. A slot antenna (30-2a, 30-2b, 30-3, 30-4, 30-5) comprising:

    a conductor (32) having a length and an axis (33) along the length;

    an open principal slot (34) that extends longitudinally at the edge of the conductor (32) along the axis (33);

    a feed point (36) having a first (36-A) coupling point on the conductor and

    one or more side slots (37) that extend from the principal slot (34), a ground plane, wherein the ground plane comprises a slot;

    wherein the conductor (32) is bent so that the ends of the one or more side slots (37) are bent (30-2a, 30-2b, 30-3, 30-4, 30-5) wherein the conductor comprising the principal slot is being placed over the slot of the ground plane.


     
    2. A slot antenna (30-3, 30-4) as in claim 1, wherein the one or more side slots (37) extend from the principal slot (34).
     
    3. A slot antenna (30-2a, 30-2b, 30-5) as in claim 2, wherein the one or more side slots (37) extend from the principal slot (34) into the conductor.
     
    4. A slot antenna as in claim 1, wherein the ends of the principal slot (34) are bent to reduce the length of the slot antenna.
     
    5. A slot antenna (30-2a, 30-3, 30-4) as in claim 1, wherein the ends of the one or more side slots (37) are bent in a U-shaped pattern or in a Z-shaped pattern.
     
    6. A slot antenna (30-2a, 30-2b, 30-3, 30-4, 30-5) as in claim 1, wherein the conductor (32) is bent to adapt the size of the antenna to fit an available mounting space.
     
    7. A slot antenna as in claim 1, wherein the side slots (37) have fractal shapes.
     
    8. A slot antenna (30-4) as in claim 1, wherein the feed point (36) is adapted to be directly attached to a printed circuit board, PCB.
     
    9. An electronic device (70, 80-1, 80-2, 80-3) comprising:
    a slot antenna (30-2a, 30-2b, 30-3, 30-4, 30-5) according to any of claims 1 to 8.
     
    10. An electronic device (70, 80-1, 80-2, 80-3) as in claim 9, wherein the principal slot (34) of the slot antenna (30-2a, 30-2b, 30-3, 30-4, 30-5) is parallel to the ground plane (50, 95).
     
    11. An electronic device (80-1) as in claim 9 or 10, wherein the slot antenna is placed at an angle over the ground plane.
     
    12. An electronic device as in claim 9, wherein the slot of the ground plane comprises a second principal slot and one or more side slots extending from the principal slot, the ends of the one or more side slots optionally being orthogonally bent in the plane of the ground plane.
     
    13. An electronic device as in claim 9 or 10, wherein the conductor of the slot antenna is adapted to partially slide within the ground plate.
     
    14. An electronic device (70, 80-1, 80-2, 80-3) as in claim 9, wherein a plurality of slot antennas (30-1a, 30-2a, 30-2b, 30-3, 30-4, 30-5) are mounted on the ground plane (50, 95), at least one of the slot antennas (30-2a, 30-2b, 30-3, 30-4, 30-5) of the plurality of slot antennas (30-1a, 30-2a, 30-2b, 30-3, 30-4, 30-5) being according to any of claims 1 to 8.
     
    15. An electronic device (70) as in claim 14, wherein a first set (30-2a) of the plurality of slot antennas have their principal slot (34) parallel to the ground plane and the remaining slot antennas (30-1a) have their principal slot (34) horizontal to the ground plane.
     
    16. An electronic device (80-1, 80-2, 80-3) as in claim 14, wherein the plurality of slot antennas (30-5, 30-3) are mounted symmetrically around a central axis orthogonal to the ground plane (50, 95) to allow, during operation of the antenna, a symmetrical far field distribution.
     
    17. A slot antenna (30-2a, 30-2b, 30-3, 30-4, 30-5) as in claim 1 adapted to either one of signal transmission, signal reception or signal transmission and reception.
     


    Ansprüche

    1. Schlitzantenne (30-2a, 30-2b, 30-3, 30-4, 30-5), umfassend:

    einen Leiter (32) mit einer Länge und einer Achse (33) entlang der Länge;

    einen offenen Hauptschlitz (34), der sich in Längsrichtung am Rand des Leiters (32) entlang der Achse (33) erstreckt;

    einen Einspeisepunkt (36) mit einem ersten (36-A) Kopplungspunkt auf dem Leiter und

    einen oder mehrere Seitenschlitze (37), die sich von dem Hauptschlitz (34) erstrecken, eine Grundplatte, wobei die Grundplatte einen Schlitz umfasst;

    wobei der Leiter (32) so gebogen ist, dass die Enden des einen oder der mehreren Seitenschlitze (37) gebogen sind (30-2a, 30-2b, 30-3, 30-4, 30-5), wobei der Leiter, der den Hauptschlitz umfasst, über dem Schlitz der Grundplatte platziert ist.


     
    2. Schlitzantenne (30-3, 30-4) nach Anspruch 1, wobei sich der eine oder die mehreren Seitenschlitze (37) von dem Hauptschlitz (34) erstrecken.
     
    3. Schlitzantenne (30-2a, 30-2b, 30-5) nach Anspruch 2, wobei sich der eine oder die mehreren Seitenschlitze (37) von dem Hauptschlitz (34) in den Leiter erstrecken.
     
    4. Schlitzantenne nach Anspruch 1, wobei die Enden des Hauptschlitzes (34) gebogen sind, um die Länge der Schlitzantenne zu verringern.
     
    5. Schlitzantenne (30-2a, 30-3, 30-4) nach Anspruch 1, wobei die Enden des einen oder der mehreren Seitenschlitze (37) in einem U-förmigen Muster oder in einem Z-förmigen Muster gebogen sind.
     
    6. Schlitzantenne (30-2a, 30-2b, 30-3, 30-4, 30-5) nach Anspruch 1, wobei der Leiter (32) gebogen ist, um die Größe der Antenne an einen verfügbaren Einbauraum anzupassen.
     
    7. Schlitzantenne nach Anspruch 1, wobei die Seitenschlitze (37) fraktale Formen aufweisen.
     
    8. Schlitzantenne (30-4) nach Anspruch 1, wobei der Einspeisepunkt (36) so angepasst ist, dass er direkt an einer Leiterplatte, PCB, befestigt werden kann.
     
    9. Elektronische Vorrichtung (70, 80-1, 80-2, 80-3), umfassend:
    eine Schlitzantenne (30-2a, 30-2b, 30-3, 30-4, 30-5) nach einem der Ansprüche 1 bis 8.
     
    10. Elektronische Vorrichtung (70, 80-1, 80-2, 80-3) nach Anspruch 9, wobei der Hauptschlitz (34) der Schlitzantenne (30-2a, 30-2b, 30-3, 30-4, 30-5) parallel zur Grundplatte (50, 95) ist.
     
    11. Elektronische Vorrichtung (80-1) nach Anspruch 9 oder 10, wobei die Schlitzantenne in einem Winkel über der Grundplatte platziert ist.
     
    12. Elektronische Vorrichtung nach Anspruch 9, wobei der Schlitz der Grundplatte einen zweiten Hauptschlitz und einen oder mehrere Seitenschlitze aufweist, die sich von dem Hauptschlitz erstrecken, wobei die Enden des einen oder der mehreren Seitenschlitze wahlweise orthogonal in der Ebene der Grundplatte gebogen sind.
     
    13. Elektronische Vorrichtung nach Anspruch 9 oder 10, wobei der Leiter der Schlitzantenne so angepasst ist, dass er teilweise in der Grundplatte gleitet.
     
    14. Elektronische Vorrichtung (70, 80-1, 80-2, 80-3) nach Anspruch 9, wobei eine Vielzahl von Schlitzantennen (30-1a, 30-2a, 30-2b, 30-3, 30-4, 30-5) auf der Grundplatte (50, 95) montiert sind, mindestens eine der Schlitzantennen (30-2a, 30-2b, 30-3, 30-4, 30-5) aus der Vielzahl von Schlitzantennen (30-1a, 30-2a, 30-2b, 30-3, 30-4, 30-5) einem der Ansprüche 1 bis 8 entspricht.
     
    15. Elektronische Vorrichtung (70) nach Anspruch 14, wobei der Hauptschlitz (34) eines ersten Satzes (30-2a) der Vielzahl von Schlitzantennen parallel zur Grundplatte liegt und der Hauptschlitz (34) der übrigen Schlitzantennen (30-1a) horizontal zur Grundplatte liegt.
     
    16. Elektronische Vorrichtung (80-1, 80-2, 80-3) nach Anspruch 14, wobei die Vielzahl von Schlitzantennen (30-5, 30-3) symmetrisch um eine zentrale Achse orthogonal zur Grundplatte (50, 95) montiert sind, um während des Betriebs der Antenne eine symmetrische Fernfeldverteilung zu ermöglichen.
     
    17. Schlitzantenne (30-2a, 30-2b, 30-3, 30-4, 30-5) nach Anspruch 1, die entweder für die Signalübertragung, den Signalempfang oder die Signalübertragung und den Signalempfang angepasst ist.
     


    Revendications

    1. Antenne à fentes (30-2a, 30-2b, 30-3, 30-4, 30-5) comprenant :

    un conducteur (32) ayant une longueur et un axe (33) sur la longueur ;

    une fente principale ouverte (34) qui s'étend longitudinalement au niveau du bord du conducteur (32) le long de l'axe (33) ;

    un point d'alimentation (36) ayant un premier (36-A) point de couplage sur le conducteur et

    une ou plusieurs fentes latérales (37) qui s'étendent à partir de la fente principale (34), un plan de base, dans laquelle le plan de base comprend une fente ;

    dans laquelle le conducteur (32) est plié de sorte que les extrémités de la ou des fentes latérales (37) sont pliées (30-2a, 30-2b, 30-3, 30-4, 30-5) dans laquelle le conducteur comprenant la fente principale est placé par-dessus la fente du plan de base.


     
    2. Antenne à fentes (30-3, 30-4) selon la revendication 1, dans laquelle la ou les fentes latérales (37) s'étendent à partir de la fente principale (34).
     
    3. Antenne à fentes (30-2a, 30-2b, 30-5) selon la revendication 2, dans laquelle la ou les fentes latérales (37) s'étendent à partir de la fente principale (34) dans le conducteur.
     
    4. Antenne à fentes selon la revendication 1, dans laquelle les extrémités de la fente principale (34) sont pliées pour réduire la longueur de l'antenne à fentes.
     
    5. Antenne à fentes (30-2a, 30-3, 30-4) selon la revendication 1, dans laquelle les extrémités de la ou des fentes latérales (37) sont pliées dans un motif en forme de U ou dans un motif en forme de Z.
     
    6. Antenne à fentes (30-2a, 30-2b, 30-3, 30-4, 30-5) selon la revendication 1, dans laquelle le conducteur (32) est plié pour adapter la taille de l'antenne pour s'ajuster à un espace de montage disponible.
     
    7. Antenne à fentes selon la revendication 1, dans laquelle les fentes latérales (37) ont des formes fractales.
     
    8. Antenne à fentes (30-4) selon la revendication 1, dans laquelle le point d'alimentation (36) est conçu pour être directement fixé à une carte à circuit imprimé, PCB.
     
    9. Dispositif électronique (70, 80-1, 80-2, 80-3) comprenant :
    une antenne à fentes (30-2a, 30-2b, 30-3, 30-4, 30-5) selon l'une quelconque des revendications 1 à 8.
     
    10. Dispositif électronique (70, 80-1, 80-2, 80-3) selon la revendication 9, dans lequel la fente principale (34) de l'antenne à fentes (30-2a, 30-2b, 30-3, 30-4, 30-5) est parallèle au plan de base (50, 95).
     
    11. Dispositif électronique (80-1) selon la revendication 9 ou 10, dans lequel l'antenne à fentes est placée selon un angle par-dessus le plan de base.
     
    12. Dispositif électronique selon la revendication 9, dans lequel la fente du plan de base comprend une deuxième fente principale et une ou plusieurs fentes latérales s'étendant à partir de la fente principale, les extrémités de la ou des fentes latérales étant éventuellement pliées orthogonalement dans le plan du plan de base.
     
    13. Dispositif électronique selon la revendication 9 ou 10, dans lequel le conducteur de l'antenne à fentes est conçu pour coulisser partiellement à l'intérieur de la plaque de base.
     
    14. Dispositif électronique (70, 80-1, 80-2, 80-3) selon la revendication 9, dans lequel une pluralité d'antennes à fentes (30-1a, 30-2a, 30-2b, 30-3, 30-4, 30-5) sont montées sur le plan de base (50, 95), au moins l'une des antennes à fentes (30-2a, 30-2b, 30-3, 30-4, 30-5) de la pluralité d'antennes à fentes (30-1a, 30-2a, 30-2b, 30-3, 30-4, 30-5) étant selon l'une quelconque des revendications 1 à 8.
     
    15. Dispositif électronique (70) selon la revendication 14, dans lequel un premier ensemble (30-2a) de la pluralité d'antennes à fentes ont leur fente principale (34) parallèle au plan de base et les antennes à fentes restantes (30-1a) ont leur fente principale (34) horizontale par rapport au plan de base.
     
    16. Dispositif électronique (80-1, 80-2, 80-3) selon la revendication 14, dans lequel la pluralité d'antennes à fentes (30-5, 30-3) sont montées symétriquement autour d'un axe central orthogonal au plan de base (50, 95) pour permettre, pendant le fonctionnement de l'antenne, une distribution en champ lointain symétrique.
     
    17. Antenne à fentes (30-2a, 30-2b, 30-3, 30-4, 30-5) selon la revendication 1 conçue pour l'un ou l'autre parmi une émission de signal, une réception de signal ou une émission et une réception de signal.
     




    Drawing






























































    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description