UWB DEVICE WITH TWO PORT ANTENNA

Abstract

 UWB device comprising an UWB antenna (100) and a transceiver (200), wherein the transceiver (200) comprises a transmitter output (211) and a receiver input (212), wherein the UWB antenna (100) comprises a ground plane (2), a radiating element (1) and a first port (10) connected to the radiating element (1), wherein the antenna comprises a second port (20) connected to the same radiating element (1), wherein the second port (20) is oriented perpendicular with respect to the first port (10), wherein the first port (10) is connected to the transmitter output (211) and the second port (20) is connected to the receiver input (212).

Description

Technical Field

[0001] The present invention relates to an UWB device with a dual port antenna.

Prior art

[0002] UWB wireless electronic devices implement normally the transmitter and receiver on the same piece of silicon, mostly for cost reasons, called a transceiver. Usually, the transmission path (TX) and the reception path (RX) are connected to an UWB antenna through a unique antenna port. The selection of the path direction (connection of the single port antenna to RX orTX) is done by an RF switch. The insertion of an RF switch takes place before the low-noise amplification (LNA) device in the RX path or after the power amplifier in the TX path (i.e. along the sensitive high-frequency signal path for both cases) and is therefore accompanied by net losses in the performance of the UWB device in reception (loss of sensitivity) and in transmission (loss of peak power and/or distortions). This type of loss has a direct impact on the link budget and must be reduced. The implementation of an RF switch is usually done directly on the silicon or by means of an external component. In the latter case, the insertion losses can be minimized by an appropriate technology, but the cost and surface area that come by adding this external component becomes a real drawback.

Brief summary of the invention

[0003] It is the object of the invention to provide a small UWB device with increased transmission/receiving characteristics.

[0004] According to the invention, this object is solved by a UWB device according to claim 1.

[0005] The advantage of the two ports connected fixed to the transmitter output and the receiver input, respectively, is that a switch between the transceiver and a single port antenna can be avoided. This avoids signal reduction by the switch. The arrangement of 90° allows to decouple the first port from the second port sufficiently such that the transmission signal does not damage or saturate the receiver section which in the present invention is not separated anymore by a switch during the transmission. The two ports in the same radiating element avoids that two distinct radiating elements are necessary for having a separate transmitter and receiver antenna. So, an UWB device with a high transmission and receiving power can be realized without the need of having a large UWB device (due to two antennas).

[0006] According to the invention, this object is further solved by an UWB antenna comprising a ground plane, a radiating element, a first port connected to the radiating element and a second port connected to the same radiating element, wherein the second port is oriented perpendicular with respect to the first port.

[0007] According to the invention, this object is solved by a UWB device comprising such an UWB antenna.

[0008] According to the invention, this object is further solved by an UWB device comprising a battery holder and an UWB antenna, wherein the UWB antenna comprises a ground plane, a radiating element, a (single or dual) port connected to the radiating element, wherein the battery holder is arranged such above the radiating element that a battery inserted in the battery holder acts as extended radiating element together with the radiating element.

[0009] The dependant claims refer to further advantageous embodiments.

[0010] In one embodiment, the UWB device comprises a transceiver comprising a transmitter output and a receiver input, wherein the UWB antenna comprises a first port connected to the radiating element and a second port connected to the same radiating element, wherein the second port is oriented perpendicular with respect to the first port, wherein the first port is connected to the transmitter output and the second port is connected to the receiver input.

[0011] In one embodiment, the radiating element, the first port and the second port are arranged symmetric with respect to a symmetry line so that the first port and the second port are each arranged at 45° with respect to the symmetry line.

[0012] In one embodiment, the radiating element is symmetric with respect to the symmetry line.

[0013] In one embodiment, the battery (hoder) is arranged above the radiating element symmetric with respect to the symmetry line.

[0014] In one embodiment, the battery is a coin cell battery.

[0015] In one embodiment, the coin cell battery and the radiating element are arranged co-centric above each other.

[0016] In one embodiment, the radiating elements comprises holes for fixing a battery holder.

[0017] In one embodiment, a negative terminal of the battery is connected to a negative conductor for connecting the negative terminal of the battery with the ground plane. Preferably, the negative conductor is arranged symmetric to the symmetry line. Preferably, the negative terminal is arranged symmetric to the symmetry line. Preferably, the radiating element is arranged on a first layer of a circuit board, wherein the negative conductor is arranged on a second layer of the circuit board below the radiating element.

[0018] In one embodiment, a positive terminal of the battery is connected to a circuit comprising the transceiver, wherein the positive terminal is arranged symmetric to the symmetry line.

[0019] In one embodiment, the radiating element, the first port, the second port and the ground plane are arranged in the same layer of a circuit plate.

[0020] In one embodiment, the first port is connected via a first grounded coplanar waveguide through the ground plane to the transmitter output, and the second port is connected via a second grounded coplanar waveguide through the ground plane to the receiver input.

[0021] In one embodiment, the ground plane forms, where the first and second grounded coplanar waveguide leaves the ground plane to the radiating element, a protrusion on both sides of each grounded coplanar waveguide in the direction towards the radiating element, wherein the protrusions are such that the distance of the protrusion of the ground plane to the coplanar waveguide increases continuously towards the radiating element.

[0022] In one embodiment, the ground plane is formed either between the two ports or opposed to the radiation element such that the ground plane has the negative form of the radiating element and/or such that the distance between the ground plane and the radiating element is substantially constant.

[0023] In one embodiment, the radiating element is a circle or a convex regular polygon with more than four corners.

[0024] In one embodiment, the UWB device is a UWB fob or badge.

[0025] Other embodiments according to the present invention are mentioned in the appended claims and the subsequent description of an embodiment of the invention.

Brief description of the Drawings

[0026] 

Fig. 1 is a view on the first or top side of the circuit board of the antenna of the UWB device according to the invention,

Fig. 2 is a view on the second or back side of the circuit board of the antenna of the UWB device according to the invention,

Fig. 3 is a three-dimensional view of the circuit board of the antenna and the battery of the UWB device according to the invention,

Fig. 4 is a three-dimensional view of the circuit board of the antenna and the battery of the UWB device according to the invention cut through at its symmetry plane.

Fig. 5 shows a top view of the UWB device with the antenna and the transceiver.

[0027] In the drawings, the same reference numbers have been allocated to the same or analogue element.

Detailed description of an embodiment of the invention

[0028] Other characteristics and advantages of the present invention will be derived from the non-limitative following description, and by making reference to the drawings and the examples.

[0029] The invention refers to an UWB device comprising an UWB antenna 100 and a transceiver 200.

[0030] The UWB antenna is an antenna whose operating frequency is at least 500 MHz and/or whose fractional bandwidth is equal to or greater than 0.2.

[0031] The UWB antenna (short antenna) comprises a ground plane 2, a radiating element 1, a first port 10 and a second port 20. The antenna is preferably realized as a monopole antenna.

[0032] Preferably, the ground plane 2 and the radiating element 1 are arranged parallel to each other, preferably on a circuit board. Preferably, the ground plane 2 and the radiating element 1 are arranged on the same layer of the circuit board. However, it would also be possible to arrange the radiating element 1 and the ground plane 2 on different layers of the circuit board. The circuit board has normally two layers on the two sides of the circuit board. The circuit board comprises a substrate between the two layers. However, more complex circuit boards can have more layers and the antenna can be realized on any of those layers of the circuit board.

[0033] The UWB antenna 100 extends mainly in a plane, preferably the plane of the circuit board. This plane is subsequently called the antenna plane. If the elements of the antenna are arranged in different layers of the circuit board, they should still be considered to be arranged in the same antenna plane. The direction perpendicular to the antenna plane is called the normal direction. Terms above, on top, etc. shall refer to a first normal direction, while terms like below, under, etc. shall refer to a second normal direction opposed to the first normal direction. The antenna plane has a first plane direction and a perpendicular second plane direction.

[0034] The radiating element 1 is arranged in the antenna plane, preferably in the first layer of the circuit board. The radiating element is realized by a conductive material, preferably arranged on the substrate of the circuit board. The radiating element is preferably shaped symmetrical to a symmetry line 4. The symmetry line 4 extends along the first plane direction. The symmetrical shape has the advantage that the antenna characteristics when used with the first port 10 is the same as when used with the second port 20. The shape of the radiating element 1 is preferably a circle or a convex regular polygon with more than 4 corners. These round or near-circle shapes have the advantage that the radiation pattern does not change for different ports 10, 20. However, also other shapes like a square shape or triangle shape or semi-circle are possible. One point of the radiating element 1 is defined as the center point 6 of the radiating element 1. The center point 6 of the circle shaped radiating element 1 is preferably the center of the circle or the convex regular polygon. The center point 6 is preferably arranged on the symmetry line 4. In the shown embodiment, a central portion of the radiating element 1 (around the center point 6) comprises a recess 33. Thus, the radiating element 1 is shaped like a ring. However, the central recess 33 can also be omitted so the radiating element 1 is filled completely with the conductive material.

[0035] The ground plane 2 is preferably arranged parallel to the radiating element 1, even more preferably co-planar (parallel with zero distance). The ground plane 2 is preferably arranged opposed to the radiating element in the first plane direction. Preferably, also the ground plane 2 is symmetrical to the symmetry line 4. Especially, in the portions of the ground plane 2 which are close to the radiating element 1, it is advantageous that the ground plane 2 is formed symmetric to the symmetry line 4. However, it is also possible that the ground plane 2 is not symmetrical to the symmetry line 4.

[0036] The ground plane 2 is preferably separated from the radiating element 1 by the substrate 7 of the circuit board. The side of the ground plane 2 facing the radiating element 1 has preferably the negative shape of the radiating element 1. In the present embodiment, the radiating element 1 has the shape of a circle and the ground plane 2 has a concave recess in the form of a segment of a circle. Thus, the distance between the radiating element 1 and the ground plane 2 in this recess 5 is constant. In addition, the strip lines 12, 22 of the ports 10, 20 extend perpendicular to the tangent line of the recess where the strip line crosses the recess. However, the side of the ground plane 2 facing the radiating element 1 can also be formed by a straight line as is the case in many monopole antennas. In this case, the strip line of the first and second port 10, 20 can be realized longer.

[0037] The first port 10 is configured to feed the antenna signal to be transmitted to the radiating element 1. The first port 10 is connected to the transmitter output 211 of the transceiver 200. The first port 10 is realized by a conductor (track) 11, 12 which connects the transmitter output 211 to the radiating element 1. The conductor 11, 12 realizing the first port 10 is preferably arranged on the first layer of the circuit board as a conductor track of the circuit board. The conductor 11, 12 extends in a straight line in the direction 15. The direction 15 of the conductor 11, 12 of the first port 10 is arranged 45° with respect to the symmetry line 4. The direction 15 of the conductor 11, 12 crosses preferably the center point 6 of the radiating element 1. The direction 15 of the conductor 11 is preferably such that the conductor 11, 12 enters the radiating element 1 in a direction perpendicular to a tangential line of the shape of the radiating element 1 where the conductor 11, 12 meets the radiating element 1. The conductor 11, 12 has a first portion 11 arranged within the ground plane 2 and a second portion 12 arranged between the ground plane 2 and the radiating element 1. The first portion 11 of the conductor is realized preferably as a grounded coplanar waveguide. Thus, the conductor 11 in the first portion has a fixed distance to the ground plane 2 on both sides of the conductor 11. The ground plane 2 has a recess 13 for the conductor 11. The second portion 12 of the conductor 11, 12 is connected on a first end with the first portion 11 of the conductor and on the second end (opposed to the first end) to the radiating element 1. The first portion 11 and the second portion 12 extend preferably along the straight line in the direction 15. Optionally, the conductor 11, 12, 16 can have a third portion 16 connected to the second end of the first portion 11 (distal from the radiating element 1), the conductor track 16 in the third portion 16 can actually deviate from the straight line in the direction 15 without any consequences for the antenna characteristics as is shown in Fig. 1 where the conductor track 11 bends by 45° to become parallel to the symmetry line 4. The first portion 11 of the conductor track 11 is preferably longer than the second portion 12. Where the conductor 11, 12 of the first port 10 leaves the ground plane 2, the ground plane 2 has a protrusion towards the radiating element 1 on both sides of the conductor 11. This protrusion 14 is formed such that the distance of the conductor 12 to the ground plane 2 (in the direction perpendicular to the direction 15) increases continuously, preferably linearly towards the radiating element 1 (until the protrusion ends). Thus, the two protrusions 14 on both sides of the conductor 2 form a conical opening of the ground plane 2 around the conductor 11, 12. These protrusions 14 are one way to adapt the antenna impedance to the desired value. However, other ways to design the antenna impedance are well known to the person skilled in the art. The first portion 11 or the third portion 16 of the conductor 11, 12 is connected with the transmitter output 211 of the transceiver 200. This connection can be done at the end of the first portion 11 opposed to the end connected to the second portion 12 of the conductor 11, 12, 16 or in the third portion 16.

[0038] The second port 20 is configured to feed the antenna signal received at the radiating element 1 to the receiver input 212 of the transceiver 200. The second port 20 is connected to the receiver input 212 of the transceiver 200. The second port 20 is realized by a conductor 21, 22, 26 which connects the receiver input 212 to the radiating element 1. The conductor 21, 22, 26 realizing the second port 20 is preferably arranged on the first layer of the circuit board as a conductor track of the circuit board. The conductor 21, 22, 26 extends in a straight line in the direction 25. The direction 25 of the conductor 21, 22, 26 of the second port 20 is arranged 45° (more precisely -45°) with respect to the symmetry line 4. The second port 20 is preferably arranged symmetrical to the first port 10 with respect to the symmetry line 4. The second port 20 is preferably arranged at an angle of 90° (perpendicular) to the first port 10. In other words, the direction 25 of the second port 20 is perpendicular to the direction 15 of the first port 20. The direction 25 of the conductor 21, 22, 26 crosses preferably the center point 6 of the radiating element 1. The direction 25 of the conductor 21 is preferably such that the conductor 21, 22, 26 enters the radiating element 1 in a direction perpendicular to a tangential line of the shape of the radiating element 1 where the conductor 21, 22, 26 meets the radiating element 1. The conductor 21, 22, 26 has a first portion 21 arranged within the ground plane 2 and a second portion 22 arranged between the ground plane 2 and the radiating element 1. The first (and/or third) portion 21 of the conductor is realized preferably as a grounded coplanar waveguide. Thus, the conductor 21 in the first portion 21 has a fixed distance to the ground plane 2 on both sides of the conductor 21 (perpendicular to the direction 25) along the conductor 21. The ground plane 2 has a recess 23 for the conductor 21. The second portion 22 of the conductor 21, 22 is connected on a first end with the first portion 21 of the conductor and on the second end (opposed to the first end) to the radiating element 1. The first portion 21 and the second portion 22 extend preferably along the straight line in the direction 25. Optionally, the conductor 21, 22, 26 can have a third portion 26 connected to the second end of the first portion 21 (distal from the radiating element 1), the conductor track 21, 22, 26 in the third portion 26 can actually deviate from the straight line in the direction 25 without any consequences for the antenna characteristics as is shown for example in Fig. 1 where the conductor track 11 bends by 45° to become parallel to the symmetry line 4. The first portion 21 of the conductor track 21, 22, 26 is preferably longer than the second portion 22. Where the conductor 21, 22, 26 of the second port 20 leaves the ground plane 2, the ground plane 2 has a protrusion 24 towards the radiating element 1 on both sides of the conductor 21. These protrusions 24 are formed such that the distance of the conductor 22 to the ground plane 2 (in the direction perpendicular to the direction 25) increases continuously, preferably linearly towards the radiating element 1 (until the protrusion ends). Thus, the two protrusions 24 on both sides of the conductor 2 form a conical opening of the ground plane 2 around the conductor 21, 22 towards the radiating element 1. These protrusions 24 are one way to adapt the antenna impedance to the desired value. However, other ways to design the antenna impedance are well known to the person skilled in the art. The first portion 21 of the conductor 21, 22 is connected with the receiver input 212 of the transceiver 200. This connection can be done at the end of the first portion 21 opposed to the end connected to the second portion 22 of the conductor 21, 22, 26 or in the third portion 26.

[0039] In a preferred embodiment, the ground plane 2 is additionally arranged on a second layer, preferably the second side of the circuit board. The outer shape of the ground plane 2' on the second side corresponds to the outer shape of the ground plane 2 on the first side (with small deviations). The ground plane 2' on the second side does not show the recesses 13, 23, as there are no ports 10, 20, and thus no conductors 11, 13, 21, 23. The two ground planes 2 and 2' on the two sides are connected between each other by the vias 9.

[0040] The transceiver 200 comprises a transmitter section TX (or short transmitter) and a receiver section RX (or short receiver). The transceiver 200 comprises a transmitter output 211 configured to connect the transceiver 200 or the transmitter section TX with the UWB antenna 100 (via the first port 10) and a receiver input 212 configured to connect the transceiver 200 or receiver section RX with the UWB antenna 100 (via the second port 20). The transmitter section TX is configured to generate a UWB signal to be transmitted via the antenna 100 at the transmitter output 211. The receiver section RX is configured to detect an UWB message in the signal received from the antenna 100 and to process the detected UWB message. This processing could be to decode the UWB message to read out transmitted data. The processing could also be a time of arrival measurement of the UWB message (e.g. for a distance bounding) or a processing necessary for an UWB radar function. The transceiver 200 is preferably realized as one chip including the transmitter section TX and the receiver section RX. However, the transceiver 200 can also be realized by a distinct chip for the transmitter section TX and for the receiver section RX. The transceiver 200 is preferably arranged in the ground plane 2, preferably on the first layer of the circuit board within the ground plane 2. The transceiver is preferably operated in half-duplex, i.e. the transmitter section TX and the receiver section RX do not operated simultaneously, but sequentially. It is also possible that same antenna for transmitter TX and receiver RX is operated in full-duplex, e.g. in the case of a (monostatic) radar. Then, the isolation between RX and TX provided by the separated ports further helps in reducing the level of the direct path (direct path from TX to RX through the radiating element).

[0041] The advantage of the two ports 10, 23 is that a switch between the transceiver and a single port antenna can be avoided, because each port is connected respectively with the transmitter section TX and the receiver section RX. This avoids expensive high quality switch components or avoids that the signal is deteriorated by the switch. The arrangement of 90° allows to decouple the first port from the second port sufficiently such that the transmission signal does not destroy, damage, overload or saturate the receiver section which in the present invention is not separated anymore by a switch during the transmission. The two ports in the same radiating element avoids that two distinct radiating elements are necessary for having a separate transmitter and receiver antenna. So, an UWB device with a high transmission and receiving power can be realized without the need of having a large UWB device (due to two antennas).

[0042] The UWB device could optionally further comprise further components like a battery 300, a power management 410, a processor 420 to name just a few.

[0043] In the case, the UWB device comprises further a battery 300, the battery 300 must normally be arranged sufficiently far from the antenna 100 so that the battery 300 with its large metal body does not shield or significantly modify the radiation pattern of the antenna 100. In the present embodiment, the battery 300 was arranged above the radiating element 100 so that the battery 300 became itself a radiating element 1 and thus rather increases the radiation power of the antenna instead of deteriorating its radiation characteristics. This solves two problems at once. The UWB device does not need to be increased for arranging the battery 300 far from the antenna 100, and the battery 300 as additional radiating element improves the performance of the antenna 100.

[0044] The battery 300 in the present embodiment is not conductively connected with the battery 300 but is coupled magnetically and/or capacitively so that the electromagnetic waves applied in the radiating element 1 are via the coupling also applied to the battery. However, in another realization, the radiation element 1 could also be conductively connected to the body of the battery 300.

[0045] The battery 300 is preferably arranged symmetric to the symmetry line 4. The coin cell battery 300 is preferably arranged such over the radiating element 1 that the center point of the battery 300 is aligned with the center point of the radiating element 1. Preferably, the shape and/or size of the radiating element 1 is similar to the shape and/or size of the battery 300.

[0046] The battery 300 is preferably a coin cell battery (also often called button cell battery). Such a coin cell battery 300 fits well with the round/circle shape of the radiating element 1. However, other battery types could also be used.

[0047] The battery 300 is hold by a battery holder 310. The battery holder 310 is preferably arranged symmetric with respect to the symmetry line 4. The battery holder 310 has a positive contact terminal 311 and a negative contact terminal 312.

[0048] The positive contact terminal 311 is preferably arranged symmetric to the symmetry line 4. For the coin cell battery 300, the positive contact terminal 311 contacts the positive terminal of the coin cell battery 300, preferably at the lateral walls of the coin cell battery 300. The positive contact terminal 311 is preferably arranged on the side of the battery 300 facing the ground plane 2. The positive contact terminal 311 is led within the region of the ground plane 2, where the positive voltage of the battery 300 can be contacted by the components of the UWB device, e.g. the power management 410 (if any) or directly by the transceiver 200. These components are preferably arranged within the ground plane 2.

[0049] The negative contact terminal 312 is preferably arranged symmetric to the symmetry line 4. For the coin cell battery 300, the negative contact terminal 312 contacts the negative terminal of the coin cell battery 300, preferably at the bottoms of the coin cell battery 300 facing towards the radiating element 1. Thus, the negative contact terminal 312 is arranged between the battery 300 and the radiating element 1. The negative contact terminal 312 is preferably arranged on the side of the battery 300 facing away from the ground plane 2, i.e. opposed to the positive contact terminal 311. The negative contact terminal 311 is led preferably on the second layer of the circuit board. The negative contact terminal 312 is preferably conducted on the second layer of the circuit board with a conductor track 8 back to the region of the ground plane 2. This conductor track 8 on the second layer of the circuit board is preferably also arranged symmetrical to the symmetry line 4. The conductor track 8 on the second layer of the circuit board is then connected via one or more vias 9 (or through connectors) with the ground plane 2 on the first layer in order to connect the ground plane 2 with the negative polarity of the battery 300. In the shown embodiment, the vias 9 are arranged along the first and second port 10, 20, in particular along the conductor tracks 11 and 21. The negative terminal 312 is preferably connected to a negative conductor portion 31 on the first side which is connected via a via 32 to the conductor track 8 on the second side of the circuit board. However, the negative terminal 312 can also be connected differently to the conductor 8 on another circuit board layer.

[0050] The radiating element 1 could have some openings 3 for fixing the battery holder 310.

[0051] The Instead of the battery 300, the UWB device could also comprise only the battery holder 310 configured to hold a battery 300 such that the battery 300 inserted in the battery holder 310 would fulfil the above description of the battery 300.

[0052] This embodiment is particularly advantageous for the described dual port antenna as it was found out that the battery 300 not only improves the radiation power, but also allows that the radiation pattern of the two ports is equally influenced by the battery 300 which would not be the case, when the battery 300 is arranged rather on one side of the radiating element 1 such that the antenna operated at the first port 10 would be influenced by the battery 300 differently than the antenna operated at the second port 20.

[0053] The arrangement of the battery 300 over the radiating element 1 could be interesting also for a dual port antenna described above for different applications, i.e. where the first and second port are not necessarily connected to the transmitter output 211 and the receiver input 212. The transmitter output 211 could be for example be connected selectively to the first port 10 and to the second port 20 (so that either the first port 10 or the second port 20 is connected to the transmitter output 211). This would allow to achieve a different transmission radiation pattern for each port 10, 20 in order to achieve different transmission channels, e.g. for a MIMO antenna. This could be also be used for a pure transmitter TX (instead of a transceiver 200). Analogously, the receiver input 212 could be for example be connected selectively to the first port 10 and to the second port 20 (so that either the first port 10 or the second port 20 is connected to the receiver input 212). This would allow to achieve a different reception radiation pattern for each port 10, 20 in order to achieve different reception channels, e.g. for a MIMO antenna. This could be also be used for a pure receiver (instead of a transceiver). The arrangement of the battery 300 over the radiating element 1 as described above, could also be interesting for a single port antenna where the single port would be arranged in the first plane direction (instead of the two ports).

[0054] In case the UWB device comprises a power management 410, the power management 410 is configured to receive the voltage from the battery 300 and to prepare a supply voltage for the transceiver 200 and maybe other components of a circuit 400 like e.g. the processor 420. The power management 410 could comprise a voltage converter to convert the battery voltage to the supply voltage. The power management 410 is preferably arranged symmetrically with respect to the symmetry line 4. The power management 410 could be realized in a power management chip 410 arranged on the circuit 400, thus mounted directly on the circuit board. However, it is also possible that the power management 410 is realized in the same chip as the transceiver 200.

[0055] In case the UWB device comprises a processor 420, the processor 420 is configured to process the signals received at the receiver RX and/or to generate signals (on a logical level) to be transmitted via the transmitter TX. The process 420 is preferably a microprocessor. The processor 420 is preferably arranged symmetrically with respect to the symmetry line 4. The processor 420 could be realized in a distinct processor chip 420 arranged on the circuit 400, thus mounted directly on the circuit board. However, it is also possible that the processor 420 is realized in the same chip as the transceiver 200.

[0056] The transceiver 200, the power management 410 and/or the processor 420 are preferably arranged in a circuit section 400 which is arranged in the area of the ground plane 2 of the antenna 100.

[0057] The invention is not limited to the described embodiments, but covers all embodiments falling in the scope of protection of the independent claims.

Claims

1. UWB device comprising an UWB antenna (100) and a transceiver (200), wherein the transceiver (200) comprises a transmitter output (211) and a receiver input (212), wherein the UWB antenna (100) comprises a ground plane (2), a radiating element (1) and a first port (10) connected to the radiating element (1),
characterized in that
the antenna comprises a second port (20) connected to the same radiating element (1), wherein the second port (20) is oriented perpendicular with respect to the first port (10), wherein the first port (10) is connected to the transmitter output (211) and the second port (20) is connected to the receiver input (212).

2. UWB device according to the previous claim, wherein the radiating element (1), the first port (10) and the second port (20) are arranged symmetric with respect to a symmetry line so that the first port (10) and the second port (20) are each arranged at 45° with respect to the symmetry line (4).

3. UWB device according to the previous claim, wherein the radiating element (1) is symmetric with respect to the symmetry line (4).

4. UWB device according to claim 2 or 3 comprising a battery (300) or battery holder (310) for holding a battery (300), wherein the battery (300) or battery holder (310) is arranged above the radiating element (1) symmetric with respect to the symmetry line (4).

5. UWB device according to the previous claim, wherein the battery (300) is a coin cell battery.

6. UWB device according to claim 4 or 5, wherein the battery (300) and the radiating element (1) are arranged co-centric above each other.

7. UWB device according to one of claims 4 to 6, wherein the radiating element (1) comprises holes (3) for fixing the battery holder (310).

8. UWB device according to one of claims 4 to 7, wherein a negative terminal (312) of the battery (300) is connected to a negative conductor (8) for connecting the negative terminal (312) of the battery (300) with the ground plane (2), wherein the negative conductor (8) is arranged symmetric to the symmetry line (4).

9. UWB device according to the previous claim, wherein the radiating element (1) is arranged on a first layer of a circuit board, wherein the negative conductor (8) is arranged as a conductor track on a second layer of the circuit board below the radiating element (1).

10. UWB device according to one of claims 4 to 9, wherein a positive terminal (311) of the battery (300) is connected to a circuit (400) comprising the transceiver (200), wherein the positive terminal (311) is arranged symmetric to the symmetry line (4).

11. UWB device according to one of the previous claims, wherein the first port (10) is connected via a first grounded coplanar waveguide (11) through the ground plane (2) to the transmitter output (211), and the second port (20) is connected via a second grounded coplanar waveguide (21) through the ground plane (2) to the receiver input (212).

12. UWB device according to claim 11, wherein the ground plane (2) forms, where the first and second grounded coplanar waveguide (11, 21) leaves the ground plane (2) to the radiating element (1), a protrusion (14, 24) on both sides of each grounded coplanar waveguide (11, 21) in the direction towards the radiating element (1), wherein the protrusions (14, 24) are such that the distance of the protrusion of the ground plane (2) to the coplanar waveguide increases continuously towards the radiating element (1).

13. UWB device according to one of claims 10 to 12, wherein the ground plane (2) in the region between the two ports (10, 20) and/or opposed to the radiating element (1) is formed such that the ground plane (2) has the negative form of the radiating element (1) and/or such that the distance between the ground plane (2) and the radiating element (1) is substantially constant.

14. UWB device according to one of the previous claims, wherein the radiating element (1) is a circle or a convex regular polygon with more than four corners.

15. UWB device according to one of the previous claims being an UWB fob or badge.

Drawing