BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
[0001] The present invention relates to an antenna, in particular, a sheet-like dipole antenna.
DESCRIPTION OF PRIOR ART
[0002] The size of a common microwave antenna is half of the wavelength (2/λ) according
to its resonance frequency, such a microwave antenna includes a dipole antenna or
a micro-strip patch antenna.
[0003] In order to further improve the miniaturization of antenna, a planar inverted-F antenna
(PIFA) has been developed recently, in which the operating length of the antenna is
reduced to only one-fourth of the wavelength (4/λ), thereby reducing the area occupied
by the antenna greatly. On the other hand, since the planar antenna has a low profile,
an embedded antenna can be achieved.
[0004] Recently, light-emitting diodes (LED) have been used in lamps and other electronic
products, and even, used in backlight modules of new-generation notebook computers
as a light source. Since the LED module is used as a backlight source in a display
screen of the computer, the space for the antenna adjacent to the LED module has been
reduced. As a result, the conventional antenna used in a notebook computer has become
unfeasible for the latest notebook computer.
SUMMARY OF THE INVENTION
[0005] The present invention is to solve the problems in conventional art. The present invention
provides a high-efficiency embedded antenna or sheet-like pointing GPS antenna used
in a wireless local area network (wireless LAN), and a high-efficiency dipole antenna
formed by using a medium of high dielectric constant as a signal input means.
[0006] The present invention is to provide a sheet-like dipole antenna, mounted within an
electronic product and including the following items:
a substrate having a copper clad surface, the copper clad surface having a slot constituted
of a short-strip section, a rectangular section, and a long-strip section, an insulating
film being provided on the copper clad surface and the slot, a rectangular first soldering
region uncovered by the insulating film being formed on the copper clad surface in
front and rear of the rectangular section of the slot respectively, a squared second
soldering region uncovered by the insulating film being formed on the copper clad
surface to connect to one side of the first soldering region, one side of the second
soldering region being connected to the long-strip section of the slot, a square third
soldering region uncovered by the insulating film being formed on the copper clad
surface to connect to the other side of the long-strip section of the slot;
an F-shape antenna which has a carrier, the top surface of the carrier having a radiation
metallic surface, the radiation metallic surface having an input pin and a grounding
short-circuit pin extending to one side of the carrier, the F-shape antenna being
soldered to both of the first soldering regions with the input pin electrically connected
to the second soldering region;
a cable with a core which is coated by an insulating layer, the insulating layer being
coated by a grounding layer, the grounding layer being coated by an outer skin, one
end of the cable being electrically connected to a connector, the core being connected
to the second soldering region, the grounding layer being soldered to the third soldering
region.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007]
FIG. 1 is a schematic view (I) showing a substrate used in manufacturing a sheet-like
dipole antenna of the present invention;
FIG. 2 is a schematic view (II) showing a substrate used in manufacturing a sheet-like
dipole antenna of the present invention;
FIG. 3 is an exploded view showing the sheet-like dipole antenna of the present invention;
FIG. 4 is an assembled view showing the sheet-like dipole antenna of the present invention;
FIG. 5 is a view showing the VSWR (voltage standing wave ratio) of the sheet-like
dipole antenna of the present invention;
FIG. 6 is a view showing the return loss of the sheet-like dipole antenna of the present
invention;
FIG. 7 is a view showing the peak gain of the sheet-like dipole antenna of the present
invention;
FIG. 8 is a view showing the efficiency of the sheet-like dipole antenna of the present
invention;
FIG. 9 is a view showing the average gain of the sheet-like dipole antenna of the
present invention;
FIGS. 10A and 10B are views showing the radiation direction of the antenna of the
present invention;
FIGS. 11A and 11B are views showing the radiation direction of the antenna of the
present invention; and
FIGS. 12A and 12B are views showing the radiation direction of the antenna of the
present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0008] The characteristics and technical contents of the present invention will be described
with reference to the accompanying drawings. However, the drawings are illustrative
only but not used to limit the present invention.
[0009] Please refer to FIGS. 1 and 2, which are schematic views (I) and (II) showing a substrate
used in manufacturing a sheet-like dipole antenna of the present invention. As shown
in these figures, substrate 1 used in manufacturing the sheet-like dipole antenna
of the present invention has a copper clad surface (metallic patch) 11. The length
L of the copper clad surface 11 is in a range from one-fourth to three-fourth of the
wavelength (that is, A/4≦L≦3λ/4), and its width W is larger than one-eighth of the
wavelength (that is, λ/8<W). The copper clad surface 11 is formed with a slot 12 constituted
of a short-strip section 12a, a rectangular section 12b and a long-strip section 12c.
[0010] After the copper clad surface 11 and the slot 12 are formed, the copper clad surface
11 is coated with insulating paint (glue) to form an insulating film (anti-soldering
region) 13. A rectangular first soldering region 14 uncovered by the insulating film
13 is formed on the copper clad surface 11 in front and rear of the rectangular section
12b of the slot 12 respectively. The first soldering regions 14 are configured to
be soldered with an F-shape antenna. A squared second soldering region 15 uncovered
by the insulating film 13 is formed on the copper clad surface 11 to connect to one
side of the first soldering region 14. One side of the second soldering region 15
is connected to the long-strip section 12c of the slot 12. A squared third soldering
region 16 uncovered by the insulating film 13 is formed on the copper clad surface
11 to connect to the other side of the long-strip section 12c of the slot 12. The
third soldering region 16 and the second soldering region 15 are located opposite
to each other in a diagonal direction.
[0011] Please refer to FIGS. 3 and 4. FIG. 3 is an exploded view showing the sheet-like
dipole antenna of the present invention, and FIG. 4 is an assembled view showing the
sheet-like dipole antenna of the present invention. As shown in these figures, the
sheet-like dipole antenna includes a substrate 1, an F-shape antenna 2, and a cable
3.
[0012] The substrate 1 is configured to have the structure as mentioned above. The F-shape
antenna 2 has a carrier 21 made of high dielectric constant materials. Top surface
of the carrier 21 has a radiation metallic surface 22. The radiation metallic surface
22 has an input pin 23 and a grounding short-circuit pin 24 extending to one side
surface of the carrier 21. The F-shape antenna 2 is soldered to both of the first
soldering regions 14 with the input pin 23 electrically connected to the second soldering
region 15.
[0013] The cable 3 has a core 31. The core 31 is coated by an insulating layer 32. The insulating
layer 32 is coated by a grounding layer 33. The grounding layer 33 is coated by an
outer skin 34. One end of the cable 3 is electrically connected with a connector 35.
The core 31 is connected to the second soldering region 15. The grounding layer 33
is soldered to the third soldering region 16. With this arrangement, the sheet-like
dipole antenna can be completed.
[0014] After the connector 35 is assembled with an antenna insertion port (not shown) on
a circuit board of an electronic product, and the radiation metallic surface 22 of
the F-shape antenna 2 receives signals, the signals are transmitted from the input
pin 23 to the core 31 of the cable 3, and then processed by the circuit board of the
electronic product.
[0015] Please refer to FIG. 5, which is a view showing the VSWR (voltage standing wave ratio)
of the sheet-like dipole antenna of the present invention. As shown in this figure,
the VSWR is 2.47 when the frequency is 2041MHz, 1.22 when the frequency is 2400MHz,
1.35 when the frequency is 2450MHz, 1.52 when the frequency is 2500MHz, and 1.30 when
the frequency is 2430MHz. Thus, the VSWR is always smaller than 3.5, which means that
the antenna of the present invention is an ideal antenna.
[0016] Please refer to FIG. 6, which is a view showing the return loss of the sheet-like
dipole antenna of the present invention. As shown in this figure, the return loss
is - 7.50dB when the frequency is 2045MHz, -20.35dB when the frequency is 2400MHz,
-16.20dB when the frequency is 2450MHz, -13.61dB when the frequency is 2500MHz, and
-17.35dB when the frequency is 2430MHz. Thus, the return loss is always smaller than
-5.0dB, which means that the antenna of the present invention is an ideal antenna.
[0017] Please refer to FIG. 7, which is a view showing the peak gain of the sheet-like dipole
antenna of the present invention. As shown in this figure, the peak gain of the sheet-like
dipole antenna of the present invention is 2.73dBi when the frequency is 2430MHz.
[0018] Please refer to FIG. 8, which is a view showing the efficiency of the sheet-like
dipole antenna of the present invention. As shown in this figure, the efficiency of
the sheet-like dipole antenna of the present invention is 80.46% when the frequency
is 2430MHz.
[0019] Please refer to FIG. 9, which is a view showing the average gain of the sheet-like
dipole antenna of the present invention. As shown in this figure, the average gain
of the sheet-like dipole antenna of the present invention is -0.94dBi when the frequency
is 2430MHz.
[0020] Please refer to FIGS. 10A and 10B, which are views showing the radiation direction
of the antenna of the present invention. As shown in these figures, in the X-Z plane,
the horizontal maximum gain is -14.98dB and the vertical maximum gain is 1.60dB when
the frequency is 2400MHz.
[0021] Please refer to FIGS. 11A and 11B, which are views showing the radiation direction
of the antenna of the present invention. As shown in these figures, in the X-Z plane,
the horizontal maximum gain is -13.63dB and the vertical maximum gain is 1.46dB when
the frequency is 2450MHz.
[0022] Please refer to FIGS. 12A and 12B, which are views showing the radiation directions
of the antenna of the present invention. As shown in these figures, in the X-Z plane,
the horizontal maximum gain is -15.71dB and the vertical maximum gain is 1.65dB when
the frequency is 2500MHz.
[0023] In summary there is disclosed a sheet-like dipole antenna which includes a substrate
1, an F-shape antenna 2, and a cable 3. The substrate 1 has a copper clad surface
11 and a slot 12. An insulating film 13 is provided on the copper clad surface 11
and the slot 12. A first soldering region 14, a second soldering region 15, and a
third soldering region 16 are positioned adjacent to the slot 12. The cable 3 has
a core 31 coated with an insulating layer 32. The insulating layer 32 is coated with
a grounding layer 33. The grounding layer 33 is coated with an outer skin 34. One
end of the cable 3 is electrically connected to a connector 35. The core 31 is connected
to the second soldering region 15. The grounding layer 33 is soldered to the third
soldering region 16.
1. A sheet-like dipole antenna, mounted within an electronic product and including:
a substrate (1) having a copper clad surface (11), the copper clad surface (11) having
a slot (12) constituted of a short-strip section (12a), a rectangular section (12b),
and a long-strip section (12c), an insulating film (13) being provided on the copper
clad surface (11) and the slot (12), a rectangular first soldering region (14) uncovered
by the insulating film (13) being formed on the copper clad surface (11) in front
and rear of the rectangular section (12b) of the slot (12) respectively, a squared
second soldering region (15) uncovered by the insulating film (13) being formed on
the copper clad surface (11) to connect to one side of the first soldering region
(14), one side of the second soldering region (15) being connected to the long-strip
section (12c) of the slot (12), a squared third soldering region (16) uncovered by
the insulating film (13) being formed on the copper clad surface (11) to connect to
the other side of the long-strip section (12c) of the slot (12); and
an F-shape antenna (2) having a carrier (21), a top surface of the carrier (21) having
a radiation metallic surface (22), the radiation metallic surface (22) having an input
pin (23) and a grounding short-circuit pin (24) extending to one side of the carrier
(21), the F-shape antenna (2) being soldered to both of the first soldering regions
(14) with the input pin (23) electrically connected to the second soldering region
(15).
2. The sheet-like dipole antenna according to claim 1, wherein a length L of the copper
clad surface (11) is in a range from one-fourth to three-fourth of the wavelength,
and its width W is larger than one-eighth of the wavelength.
3. The sheet-like dipole antenna according to claim 2, wherein the third soldering region
(16) and the second soldering region (15) are located opposite to each other in a
diagonal direction.
4. The sheet-like dipole antenna according to claim 1 or 2, wherein the carrier (21)
is made of high dielectric constant materials.
5. The sheet-like dipole antenna according to claim 1 or 2, wherein the carrier (21)
is configured as a metallic conductor, so that copper clad lines on both ends of the
first soldering region (14) are electrically connected to each other.
6. The sheet-like dipole antenna according to one of the preceding claims, further including
a cable (3) with a core (31), the core (31) being coated by an insulating layer (32),
the insulating layer (32) being coated by a grounding layer (33), the grounding layer
(33) being coated by an outer skin (34), one end of the cable (3) being electrically
connected to a connector (35).
7. The sheet-like dipole antenna according to claim 6, wherein the core (31) is connected
to the second soldering region (15), and the grounding layer (33) is soldered to the
third soldering region (16).