CN220306505U - Multi-frequency antenna - Google Patents

Abstract

The utility model discloses a multi-frequency antenna, which comprises a substrate and a radiation part; the substrate includes opposing upper and lower surfaces; the radiation part is arranged on the upper surface of the substrate and comprises a first branch and a second branch; the first branch is used for generating a low-frequency signal and/or an intermediate-frequency signal, and at least one part of the first branch extends along the length direction of the substrate; the second branch is used for generating a high-frequency signal, and extends from one end of the second branch along the width direction of the substrate; wherein the high-frequency signal comprises 3300-3800 MHz frequency band and/or 4400-5000 MHz frequency band; the low-frequency signal comprises a frequency band of 698-960 MHz, and the intermediate-frequency signal comprises a frequency band of 1710-2690 MHz. The multi-frequency antenna is used for being compatible with 2G, 3G, 4G and 5G frequency bands simultaneously, and the arrangement of the first branch and the second branch is more reasonable.

Description

Multi-frequency antenna

Technical Field

The utility model relates to the technical field of antennas, in particular to a multi-frequency antenna.

Background

With the development of communication technology, 5G (fifth generation mobile communication technology) has been gradually popularized; meanwhile, the traditional 2G (second generation mobile phone communication technology specification), 3G (third generation mobile communication technology) and 4G (fourth generation mobile communication technology) are still mainstream communication technologies in the market today.

Various intelligent network products such as routers, unmanned aerial vehicles, intelligent network televisions and the like still adopt antennas which can only be accessed to 2G, 3G or 4G networks, and the existing part of intelligent network products need updating iteration for accessing to 5G networks; and in order to meet market needs, the intelligent network product is also required to be compatible with 2G, 3G and 4G after update iteration is carried out. Therefore, how to realize that the antenna can access the 5G signal while being compatible with 2G, 3G and 4G is a problem to be solved.

Disclosure of Invention

The utility model aims to provide a multi-frequency antenna which is compatible with 2G frequency bands and/or 3G and 4G frequency bands and simultaneously compatible with 5G frequency bands, and the volume of the multi-frequency antenna is reduced.

The utility model adopts the following technical scheme:

a multi-frequency antenna, comprising:

a substrate including opposite upper and lower surfaces;

the radiation part is arranged on the upper surface of the substrate and comprises a first branch and a second branch; the first branch is used for generating a low-frequency signal and/or an intermediate-frequency signal, and at least one part of the first branch extends along the length direction of the substrate; the second branch is used for generating a high-frequency signal, and extends from one end of the second branch along the width direction of the substrate;

wherein the high-frequency signal comprises 3300-3800 MHz frequency band and/or 4400-5000 MHz frequency band; the low-frequency signal comprises a frequency band of 698-960 MHz, and the intermediate-frequency signal comprises a frequency band of 1710-2690 MHz.

Preferably, the device further comprises a grounding part, wherein the grounding part is arranged on the upper surface of the substrate; the second branch is arranged on one side, adjacent to the grounding part, of the radiating part, and a parasitic branch is arranged on one end, adjacent to the grounding part, of the grounding part, and is used for adjusting the high-frequency signals.

Preferably, the antenna further comprises a microstrip line and a third branch, wherein the third branch is used for adjusting impedance matching; one end of the third branch is connected with the radiation part, and the other end of the third branch is connected with the microstrip line.

Preferably, the micro-strip antenna further comprises a grounding part, wherein the grounding part is arranged on the upper surface of the substrate, the grounding part is provided with a notch, at least one part of the micro-strip line is arranged in the notch, and the micro-strip line and the grounding part are mutually spaced.

Preferably, the multi-frequency antenna includes a core pad connected to the microstrip line, the notch extending from the core pad to an outside of the ground portion;

and/or the distance between the microstrip line and the grounding part is 0.4mm.

Preferably, the antenna further comprises a microstrip line and a radio frequency cable; the multi-frequency antenna comprises a core wire bonding pad and a grounding bonding pad which are mutually spaced; the radio frequency cable is used for connecting the core wire bonding pad and the grounding bonding pad, the microstrip line is used for connecting the core wire bonding pad and the radiating part, and the grounding bonding pad is used for connecting the grounding part.

Preferably, the total length of the first stub is one quarter of the medium wavelength.

Preferably, the first branch includes a first branch portion and a second branch portion extending in the substrate length direction, and a third branch portion extending in the substrate width direction;

the first branch part and the second branch part are arranged at intervals, the second branch part and the second branch part are arranged at intervals, the third branch part is connected with the first branch part and the second branch part, and the third branch part is close to or arranged at the edge of the broadside of the substrate.

Preferably, the second branch extends from the first branch in a direction toward a side of the substrate away from the first branch.

Preferably, the substrate is an FPC flexible substrate, a connection layer is provided on the lower surface of the substrate, and the substrate can be fixedly mounted on an external device through the connection layer.

Compared with the prior art, the utility model has the beneficial effects that at least:

the antenna can be compatible with 2G and/or 3G and 4G frequency bands by arranging the first branch, and can be compatible with 5G frequency bands by arranging the second branch, so that the multi-frequency antenna can be compatible with 2G and/or 3G and 4G frequency bands and simultaneously can be compatible with 5G frequency bands; and, through setting up the at least part of first branch to extend along the length direction of base plate, set up the second branch as the one end from the second branch, extend along the width direction of base plate for first branch is more reasonable with the arrangement of second branch, and can reduce the required area that occupies of radiation portion under the prerequisite of guaranteeing antenna performance, thereby reduce multifrequency antenna's volume.

Drawings

Fig. 1 is a schematic structural diagram of a multi-frequency antenna according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the structure of the lower surface of the substrate according to the embodiment of the utility model;

FIG. 3 is a graph showing the variation of the frequency versus standing wave ratio of the multi-frequency antenna according to the embodiment of the present utility model;

fig. 4 is a graph showing the frequency versus the antenna gain of the multi-band antenna according to the embodiment of the present utility model;

fig. 5 is a graph showing the frequency versus the antenna efficiency of the multi-band antenna according to the embodiment of the present utility model.

In the figure: 1. a substrate; 11. a connection layer; 12. an upper surface; 13. a lower surface; 2. a radiation section; 21. a first branch; 211. a first leg; 212. a second leg; 213. a third leg; 22. a second branch; 3. a grounding part; 31. parasitic branches; 32. a notch; 4. a microstrip line; 5. a third branch; 6. a radio frequency cable; 7. a core wire bonding pad; 8. and a ground pad.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted.

The words expressing the positions and directions described in the present utility model are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present utility model.

As shown in fig. 1, a multi-frequency antenna according to an embodiment of the present utility model includes a substrate 1, a radiating portion 2, a grounding portion 3, a core wire pad 7, a grounding pad 8, a microstrip line 4, a third branch 5, and a radio frequency cable 6.

With further reference to fig. 1 and 2, the substrate 1 includes opposing upper and lower surfaces 12, 13. The upper surface 12 may be used to provide the structures of the radiating portion 2, the ground portion 3, the core pad 7, the ground pad 8, the microstrip line 4, the third stub 5, etc. The lower surface 13 may be provided with a connection layer 11 so that the substrate 1 can be fixed to an external device through the connection layer 11. The connection layer 11 may be a glue layer, and the substrate 1 is fixed to an external device by means of gluing. In addition, in order to facilitate the storage and transportation of the substrate 1, the substrate 1 may be further connected with release paper, where the release paper is attached to the connection layer 11 of the substrate 1, so as to avoid the connection layer 11 of the substrate 1 from being fixedly connected with other objects during the storage and transportation, affecting the connection between the subsequent substrate 1 and external devices, and the picking of the substrate 1. The external device may be an intelligent network product such as a router, an unmanned aerial vehicle, an intelligent network television, etc., and the substrate 1 is installed at a position for installing an antenna in the intelligent network product.

Preferably, the substrate 1 may be an FPC flexible substrate, so that the substrate 1 may be bent and deformed when connected to an external device, and further may be firmly connected to a non-planar portion in the external device, for example, the substrate 1 may be attached to an arc surface or an irregular surface in an adapting manner, so as to improve flexibility of an installation position of the substrate 1. And, the flexible substrate of FPC has advantages such as processing is simple, the preparation cycle is short, with low costs, light in weight, and the antenna that uses this flexible substrate of FPC can possess processing portably, and earlier stage proofing and later stage manufacturing's cycle are shorter, and the cost is lower, and the antenna that adopts flexible substrate of FPC 1 also can have higher radiant efficiency.

The radiation portion 2 is provided on the upper surface 12 of the substrate 1. The radiating portion 2 includes a first branch 21 and a second branch 22. The first branch 21 is used for generating a low frequency signal and/or an intermediate frequency signal, wherein the low frequency signal comprises a frequency band of 698-960 MHz, i.e. the low frequency signal comprises at least part of a 2G network frequency band. The intermediate frequency signal comprises a frequency band of 1710-2690 MHz, i.e. the intermediate frequency signal comprises at least part of the 3G and 4G frequency bands. The first stub 21 is preferably used to generate a low frequency signal and an intermediate frequency signal, so that the multi-frequency antenna of the present utility model can be compatible with 2G, 3G, and 4G frequency bands through the first stub 21. When the frequency ranges of the multi-frequency antenna in the 2G, 3G and 4G frequency bands need to be adjusted, the length of the first branch 21 can be adjusted to adjust the frequency ranges of the low frequency band and the middle frequency band of the multi-frequency antenna. Preferably, the total length of the first stub 21 is one quarter of the medium wavelength. The medium wavelength is the transmission distance of the antenna in one vibration period in the medium, and the medium can be air or the like.

The first branch 21 may include a first branch 211 and a second branch 212 extending in the length direction of the substrate 1, and a third branch 213 extending in the width direction of the substrate 1. The first branch portion 211 and the second branch portion 212 are disposed at intervals, and the first branch portion 211 may be close to or disposed at an edge of one long side of the substrate 1, and the second branch portion 212 may be close to or disposed at an edge of the other long side of the substrate 1. The third branch 213 connects the first branch 211 and the second branch 212, and the third branch 213 is near or disposed at the edge of the wide side of the substrate 1. The total length of the first branch 21 can be the sum of the lengths of the first branch 21, the second branch 22 and the third branch 5.

The second branch 22 is used for generating a high frequency signal, which comprises 3300-3800 MHz frequency band, and/or 4400-5000 MHz frequency band, i.e. the high frequency signal comprises at least part of the 5G frequency band, so that the multi-frequency antenna of the present utility model can be compatible with the 5G frequency band through the second branch 22. When the frequency range of the multi-frequency antenna in the 5G frequency band needs to be adjusted, the length of the second branch 22 can be adjusted to adjust the frequency range of the high frequency band of the multi-frequency antenna.

The second branch 22 extends from one end of the first branch 21 in the width direction of the substrate 1. For example, the second branch 22 may extend from the first branch 211 toward one end of the ground portion 3, along the width direction of the substrate 1, toward the side of the substrate 1 where the second branch 212 is provided; the second branch 22 may extend directly to the edge of the long side of the substrate 1 or to the edge near the long side of the substrate 1; the second branch 22 may be spaced apart from the second branch 212.

By arranging the first branch 211 and the second branch 212 in the first branch 21 to extend along the length direction of the substrate 1 and arranging the second branch 22 to extend along the width direction of the substrate 1, the arrangement of the first branch 21 and the second branch 22 can be more reasonable, and the occupied area of the radiation part 2 can be reduced on the premise of ensuring the performance of the antenna, so that the volume of the multi-frequency antenna is reduced, and the antenna can be applied to miniaturized equipment.

The grounding part 3 is disposed on the upper surface 12 of the substrate 1, is located at one side of the radiation part 2, and is insulated from the radiation part 2. The ground part 3 is provided with a parasitic stub 31 and a recess 32. The parasitic stub 31 is disposed at an end of the grounding part 3 near the radiating part 2, and the parasitic stub 31 may be used to adjust a frequency band of the high-frequency signal generated by the second stub 22. Specifically, when the frequency band of the high-frequency signal generated by the second branch 22 needs to be adjusted, the frequency band of the high-frequency signal generated by the second branch 22 may be adjusted by adjusting the length of the parasitic branch 31.

The parasitic dendrites 31 may be provided in a pair, the pair of parasitic dendrites 31 are provided opposite to each other, and one parasitic dendrite 31 may be provided at an edge of one long side of the substrate 1 or an edge near one long side of the substrate 1, and the other parasitic dendrite 31 may be provided at an edge of the other long side of the substrate 1 or an edge near the other long side of the substrate 1.

The notch 32 may be used to place at least a portion of the microstrip line 4, and the notch 32 may extend from the core pad 7 to the outside of the ground 3. The width of the notch 32 may be larger than the width of the microstrip line 4 so that the microstrip line 4 disposed in the notch 32 may be spaced apart from the ground 3.

One end of the microstrip line 4 may be connected to the core pad 7, and the microstrip line 4 may extend from the core pad 7 to the outside of the ground 3. When the microstrip line 4 is disposed in the notch 32, the distance between the microstrip line 4 and the ground part 3 can be adjusted to adjust the impedance matching between the middle band and the high band in the multi-band antenna. Preferably, the distance between the microstrip line 4 and the ground part 3 is 0.4mm, and in the multi-frequency antenna, the impedance matching between the middle frequency band and the high frequency band is optimal, and the multi-frequency antenna can have good standing wave performance.

One end of the third branch 5 may be connected to the radiating portion 2, and the other end may be connected to the microstrip line 4. The third branch 5 may specifically be an impedance matching branch having an impedance matching adjusting function.

The ground pad 8 is used for connecting the ground part 3, and the ground pad 8 and the core pad 7 are spaced apart from each other and insulated from each other, the ground pad 8 can be connected with the core pad 7 through the radio frequency cable 6, and the core pad 7 can be connected with the radiating part 2 through the microstrip line 4 and the third branch 5, so that the radiating part 2 and the ground part 3 constitute a multi-frequency antenna structure. .

Wherein one end of the radio frequency cable 6 is used for being connected with the grounding pad 8 and the core wire pad 7, and the other end can be connected with terminal equipment. The radio frequency cable 6 may include a coaxial radio frequency cable core wire, and an insulating layer, a shielding layer and a sheath sequentially coated on the outer side of the coaxial radio frequency cable core wire. The insulating layer is disposed between the coaxial radio frequency cable core and the shielding layer to insulate the coaxial radio frequency cable core and the shielding layer from each other. The sheath is sleeved outside the shielding layer to protect the shielding layer. The coaxial radio frequency cable core is connected to the core wire pad 7, for example, the coaxial radio frequency cable core is soldered to the core wire pad 7. The shielding layer is connected to the ground pad 8, for example, the shielding layer is soldered to the ground pad 8.

Referring to fig. 3 to 4, the test result of HFSS (High Frequency Structure Simulator, high frequency structure simulation) is adopted for the multi-frequency antenna of the present utility model, and when the frequency band is 698-960 MHz, the S11 output standing wave is less than 3.0, and the gain is more than 0dBi; when the frequency ranges are 1710-2690 MHz, 3300-3800 MHz and 4400-5000 MHz, S11 output standing waves are less than 2.5, and the gain is more than 1.0dBi. Wherein S11 is the return loss. As shown in FIG. 5, the radiation efficiency of the multi-frequency antenna of the utility model is more than 40% when the frequency ranges are 698-960 MHz, 1710-2690 MHz, 3300-3800 MHz and 4400-5000 MHz. Therefore, the multi-frequency antenna has good radiation performance and broadband characteristics, namely a wider frequency band.

While embodiments of the present utility model have been shown and described, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that changes, modifications, substitutions and alterations may be made therein by those of ordinary skill in the art without departing from the spirit and scope of the utility model, all such changes being within the scope of the appended claims.

Claims (10)

1. A multi-frequency antenna, comprising:

a substrate (1) comprising opposite upper (12) and lower (13) surfaces;

a radiation portion (2) provided on an upper surface (12) of the substrate (1), the radiation portion (2) including a first branch (21) and a second branch (22); the first branch (21) is used for generating a low-frequency signal and/or an intermediate-frequency signal, and at least one part of the first branch (21) extends along the length direction of the substrate (1); the second branch (22) is used for generating a high-frequency signal, and the second branch (22) extends from one end of the second branch (22) along the width direction of the substrate (1);

wherein the high-frequency signal comprises 3300-3800 MHz frequency band and/or 4400-5000 MHz frequency band; the low-frequency signal comprises a frequency band of 698-960 MHz, and the intermediate-frequency signal comprises a frequency band of 1710-2690 MHz.

2. The multifrequency antenna according to claim 1, further comprising a ground (3), the ground (3) being provided on an upper surface (12) of the substrate (1); the second branch (22) is arranged on one side, adjacent to the grounding part (3), of the radiating part (2), a parasitic branch (31) is arranged on one end, adjacent to the grounding part (3), of the radiating part (2), and the parasitic branch (31) is used for adjusting the high-frequency signal.

3. The multi-frequency antenna according to claim 1, further comprising a microstrip line (4) and a third stub (5), the third stub (5) being for adjusting impedance matching; one end of the third branch (5) is connected with the radiation part (2), and the other end of the third branch is connected with the microstrip line (4).

4. A multi-frequency antenna according to claim 3, further comprising a ground portion (3), the ground portion (3) being arranged on the upper surface (12) of the substrate (1), the ground portion (3) being provided with a recess (32), at least a portion of the microstrip line (4) being arranged in the recess (32), and the microstrip line (4) being spaced from the ground portion (3).

5. The multi-frequency antenna according to claim 4, characterized in that it comprises a core pad (7), the core pad (7) being connected to the microstrip line (4), the notch (32) extending from the core pad (7) to the outside of the ground (3);

and/or the distance between the microstrip line (4) and the grounding part (3) is 0.4mm.

6. The multi-frequency antenna according to claim 2, further comprising a microstrip line (4) and a radio frequency cable (6); the multi-frequency antenna comprises a core wire bonding pad (7) and a grounding bonding pad (8) which are mutually spaced; the radio frequency cable (6) is used for connecting the core wire bonding pad (7) and the grounding bonding pad (8), the microstrip line (4) is used for connecting the core wire bonding pad (7) and the radiating part (2), and the grounding bonding pad (8) is used for connecting the grounding part (3).

7. The multifrequency antenna according to claim 1, characterized in that the total length of the first stub (21) is a quarter of the dielectric wavelength.

8. The multi-frequency antenna according to claim 1, wherein the first stub (21) comprises a first branch (211) and a second branch (212) extending in a length direction of the substrate (1), and a third branch (213) extending in a width direction of the substrate (1);

the first branch part (211) and the second branch part (212) are arranged at intervals, the second branch part (212) and the second branch part (22) are arranged at intervals, the third branch part (213) is connected with the first branch part (211) and the second branch part (212), and the third branch part (213) is close to or arranged at the edge of the broadside of the substrate (1).

9. The multifrequency antenna according to claim 8, characterized in that the second stub (22) extends from the first branch (211) in a direction towards the side of the substrate (1) remote from the first branch (211).

10. The multifrequency antenna according to claim 1, characterized in that the substrate (1) is an FPC flexible substrate, the lower surface (13) of the substrate (1) is provided with a connection layer (11), and the substrate (1) can be fixedly mounted to an external device through the connection layer (11).