Double-fed array antenna

Abstract

The utility model belongs to the technical field of wireless communication, and relates to a double-fed array antenna, which comprises a PCB (printed circuit board), a first antenna unit and a second antenna unit. The first antenna unit and the second antenna unit are arranged on the PCB; the first antenna unit comprises a plurality of first radiation paste bodies, impedance conversion lines and a high-frequency feed point, the plurality of first radiation paste bodies are distributed at intervals in an array mode, one impedance conversion line is arranged between every two first radiation paste bodies, and the first or last first radiation paste body is connected to the high-frequency feed point and used for being connected with a high-frequency feed line; the second antenna unit is provided with a low-frequency feed point used for being connected with a low-frequency feed line. According to the double-fed array antenna provided by the utility model, on the basis that the small size of the antenna is maintained, the performance of high gain and omnidirectional radiation direction coverage is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communications, in particular to a dual-feed array antenna. Background Art

[0002] With the advancement of communication technology, Wi-Fi is becoming increasingly widespread and indispensable in our lives. This has led to a growing demand for miniaturized antennas and multi-band Wi-Fi coverage. In recent years, microstrip and PCB antennas have gained widespread adoption due to their low cost, low profile, and light weight. However, the inherent drawbacks of microstrip antennas, such as their narrow operating bandwidth and non-omnidirectionality, have hindered their further development and application.

[0003] Therefore, there is an urgent need for an antenna that achieves high gain and omnidirectional radiation coverage while maintaining a small size. Utility Model Content

[0004] In view of this, the present invention provides a dual-feed array antenna for solving the problems of the existing technical solutions such as large antenna size, narrow working bandwidth and non-omnidirectionality.

[0005] To achieve one, part, or all of the above-mentioned objectives or other objectives, the present invention provides a dual-fed array antenna, comprising a PCB board, a first antenna unit, and a second antenna unit; the first antenna unit and the second antenna unit are both arranged on the PCB board;

[0006] The first antenna unit includes a plurality of first radiating patches, an impedance transformation line, and a high-frequency feeding point. The plurality of first radiating patches are spaced apart in an array. One impedance transformation line is provided between every two first radiating patches. The first or last first radiating patch is connected to the high-frequency feeding point and is used to connect to the high-frequency feeding line.

[0007] The second antenna unit is provided with a low frequency feeding point for connecting to a low frequency feed line.

[0008] Furthermore, the first antenna unit is further provided with a reference ground branch;

[0009] The high-frequency feeding point is provided on the first or last of the first radiation patches, and the first reference ground is provided on the reference ground branch.

[0010] Furthermore, the middle portion of the impedance transformation line is in a serpentine bending state.

[0011] Furthermore, the frequency band of the first antenna unit is 5.15 GHz-5.85 GHz.

[0012] Furthermore, the second antenna unit also includes a plurality of second radiating bodies and coaxial cables, wherein the plurality of second radiating bodies are distributed in an array, a coaxial cable is arranged between every two second radiating bodies, and the first or last second radiating body is connected to the low-frequency feeding point.

[0013] Furthermore, the first radiation patch includes two radiation patches that are paired with each other;

[0014] The inner and outer layers of one end of the coaxial cable are respectively connected to the two radiation patches of the second radiation patch.

[0015] Furthermore, the second antenna unit further includes a T-shaped branch, and the T-shaped branch is provided between the two radiation patches of the first or last second radiation patch;

[0016] The inner and outer layers of one end of the coaxial cable are respectively connected to the T-shaped branch and one of the radiating patches of the second radiating body. The low-frequency feeding point is provided on the T-shaped branch, and the other radiating patch of the second radiating body is correspondingly provided with a second reference ground. The second reference ground is used to cooperate with the low-frequency feeding point to connect the low-frequency feed line.

[0017] Furthermore, the T-shaped branch includes a first branch, a second branch and a third branch, the second branch is vertically connected to the middle of the first branch, one end of the third branch is vertically connected to the middle of the second branch to form a vertical point, the low-frequency feeding point is arranged at the other end of the third branch, and the inner layer of one end of the coaxial cable is connected to the vertical point.

[0018] Furthermore, the second radiation patch is a dipole patch.

[0019] Furthermore, the frequency band of the second antenna unit is 2.4 GHz-2.5 GHz.

[0020] The implementation of the present invention will have the following beneficial effects:

[0021] The dual-fed array antenna proposed in this utility model achieves high-frequency communication through the first antenna element. The combination of an array-like first radiating element and an impedance transformation line achieves high gain and directivity, meeting the signal quality and directivity requirements of high-frequency communication. Low-frequency communication is then achieved through the second antenna element. Signals in different frequency bands are transmitted and received using independent antenna elements. The first and second antenna elements are integrated onto a printed circuit board (PCB) to increase the operating bandwidth. Overall, the antenna achieves high gain and omnidirectional coverage while maintaining a small footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] in:

[0024] Figure 1 This is a schematic structural diagram of a dual-feed array antenna in one embodiment of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of A;

[0026] Figure 3 for Figure 1 Schematic diagram of the structure of B;

[0027] Figure 4 This is a diagram of antenna isolation of a dual-fed array antenna in one embodiment of the present utility model;

[0028] Figure 5 This is a 2.4GHz antenna return loss diagram of a dual-fed array antenna in one embodiment of the present invention;

[0029] Figure 6 This is a 5.8GHz antenna return loss diagram of a dual-fed array antenna in one embodiment of the present invention;

[0030] Figure 7 This is a 2.4GHz antenna efficiency diagram of a dual-fed array antenna in one embodiment of the present invention;

[0031] Figure 8 This is a 5.8GHz antenna efficiency diagram of a dual-fed array antenna in one embodiment of the present invention;

[0032] Figure 9 The 2.4 GHz antenna gain diagram of the dual-fed array antenna in one embodiment of the present invention is shown in FIG.

[0033] Figure 10 5.8 GHz antenna gain diagram of a dual-fed array antenna in one embodiment of the present invention;

[0034] Figure 11 The 2.4 GHz antenna pattern of the dual-fed array antenna in one embodiment of the present invention;

[0035] Figure 12 Another 2.4 GHz antenna pattern of the dual-fed array antenna in one embodiment of the present invention;

[0036] Figure 13 The 5.8 GHz antenna pattern of the dual-fed array antenna in one embodiment of the present invention;

[0037] Figure 14 This is another 5.8 GHz antenna pattern of the dual-fed array antenna in one embodiment of the present invention.

[0038] Reference numerals:

[0039] 10. PCB board; 20. First antenna unit; 21. First radiation patch; 22. Impedance transformation line; 23. High-frequency feeding point; 24. Reference ground branch; 25. First reference ground; 30. Second antenna unit; 31. Second radiation patch; 311. Radiation patch; 32. Coaxial cable; 321. Inner conductor; 322. Outer conductor; 323. Intermediate dielectric layer; 33. Low-frequency feeding point; 34. T-shaped branch; 341. First branch; 342. Second branch; 343. Third branch; 35. Second reference ground. DETAILED DESCRIPTION

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains; the terms used in the specification of the application are for the purpose of describing specific embodiments only and are not intended to limit this invention; the terms "including" and "having" and any variations thereof in the specification and claims of this invention and the accompanying drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this invention or the accompanying drawings are used to distinguish different objects rather than to describe a specific order. The cold water mentioned in the specification and claims of this invention includes water at room temperature.

[0041] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0043] Reference Figures 1 to 14The first embodiment of the present application provides a dual-feed array antenna, which includes a PCB board 10, a first antenna unit 20, and a second antenna unit 30; the first antenna unit 20 and the second antenna unit 30 are both provided on the PCB board 10;

[0044] The first antenna unit 20 includes a plurality of first radiating patches 21, an impedance transformation line 22, and a high-frequency feeding point 23. The plurality of first radiating patches 21 are spaced apart in an array, an impedance transformation line 22 is provided between every two first radiating patches 21, and the first or last first radiating patch 21 is connected to the high-frequency feeding point 23 for connecting to the high-frequency feeding line.

[0045] The second antenna unit 30 is provided with a low frequency feeding point 33 for connecting to a low frequency feeding line.

[0046] High-frequency communication is achieved through the first antenna unit 20, efficiently radiating and receiving high-frequency electromagnetic waves. The combination of a multi-element array of first radiating patches 21 and impedance transformation lines 22 achieves high gain and directivity, meeting the signal quality and directivity requirements of high-frequency communication. Low-frequency communication is then achieved using the second antenna unit 30. Signals in different frequency bands are transmitted and received through independent antenna units. The first and second antenna units 20 and 30 are integrated onto the PCB 10 to increase the operating bandwidth. In summary, while maintaining a small antenna size, high gain and omnidirectional radiation coverage are achieved.

[0047] The impedance transformation line 22 and reference ground branch 24 achieve good impedance matching between the antenna and feeder, reducing reflections and signal loss during transmission. The array-like distribution of radiating patches and optimized impedance matching design help improve the antenna's radiation efficiency, radiating more energy as electromagnetic waves. By adjusting the array layout of the radiating patches and the shape and position of the reference ground branch 24, the antenna's radiation pattern can be controlled to achieve specific directivity requirements.

[0048] Specifically, the first antenna unit 20 determines the number of first radiating bodies 21 according to performance requirements (i.e., the number and size of the radiating bodies will be designed according to performance requirements such as the required frequency band, gain and bandwidth. In the low frequency band, the size of the radiating body may be relatively large).

[0049] refer to Figures 1 to 2 The first antenna unit 20 is further provided with a reference ground branch 24 ; a high-frequency feeding point 23 is provided on the first or last first radiation patch 21 , and a first reference ground 25 is provided on the reference ground branch 24 .

[0050] In this embodiment, high-frequency feed point 23 connects the antenna to the feeder line and is responsible for efficiently transmitting power or RF signals to the antenna radiator. Reference ground branch 24 provides a stable potential reference point for the antenna, helping to reduce electromagnetic interference between the antenna and its surroundings, thereby improving the antenna's radiation pattern and impedance characteristics.

[0051] refer to Figures 1 to 2 The middle portion of the impedance transformation line 22 is in a serpentine bending state.

[0052] Specifically, the impedance transformation line 22 is used to reduce the side lobe effect of the directional pattern. The characteristic impedance of the impedance transformation line 22 is adjusted by changing its physical length and shape to achieve better matching with the impedance transformation lines 22 or loads connected before and after.

[0053] In this embodiment, the frequency band of the first antenna unit 20 is 5.15 GHz-5.85 GHz.

[0054] Preferably, the frequency band of the first antenna unit 20 is 5.8 GHz.

[0055] refer to Figure 1 and Figure 3 The second antenna unit 30 also includes a plurality of second radiating bodies 31 and coaxial cables 32. The plurality of second radiating bodies 31 are distributed in an array, a coaxial cable 32 is arranged between every two second radiating bodies 31, and the first or last second radiating body 31 is connected to the low-frequency feeding point 33.

[0056] In this embodiment, a plurality of second radiating patches 31 are arranged in an array, spaced apart from one another. This arrangement helps form a directional radiation pattern, improving the antenna's directivity and gain. The number and size of the radiating patches are designed based on the desired frequency band, gain, bandwidth, and other performance requirements. In low-frequency bands, the radiating patches may be relatively large.

[0057] refer to Figure 1 and Figure 3 The first radiation patch 21 includes two radiation patches 311 that are paired with each other;

[0058] The inner and outer layers of one end of the coaxial cable 32 are respectively connected to two radiation patches 311 of a second radiation patch 31 .

[0059] Specifically, the coaxial cable 32 includes an inner conductor 321, an outer conductor 322, and an intermediate dielectric layer 323 (typically polytetrafluoroethylene, or Teflon). The two ends of the inner conductor 321 are connected to one of the radiating patches 311 of the two second radiating bodies 31 (if the second radiating body 31 is provided with a T-shaped branch 34, one end of the inner conductor 321 is connected to the T-shaped branch 34). The two ends of the outer conductor 322 are connected to the other radiating patch 311 of the two second radiating bodies 31.

[0060] The array-like arrangement of the second radiating patches 31 and the coaxial cables 32 helps improve the gain and directivity of the antenna. By adjusting the number and spacing of the second radiating patches 31, the radiation pattern of the antenna can be optimized to better meet application requirements.

[0061] refer to Figure 1 and Figure 3 The second antenna unit 30 further includes a T-shaped branch 34, which is provided between the two radiation patches 311 of the first or last second radiation patch 31;

[0062] The inner and outer layers of one end of the coaxial cable 32 are respectively connected to a T-shaped branch 34 and a radiating patch 311 of the second radiating body 31. A low-frequency feeding point 33 is provided on the T-shaped branch 34, and another radiating patch 311 of the second radiating body 31 is correspondingly provided with a second reference ground 35. The second reference ground 35 is used to cooperate with the low-frequency feeding point 33 to connect the low-frequency feed line.

[0063] In this embodiment, the T-shaped branch 34 serves as a feeding point for the low-frequency signal and effectively transmits the signal to the radiation patch 311 , and the coupling effect of the T-shaped branch 34 is better.

[0064] refer to Figure 1 and Figure 3 The T-shaped branch 34 includes a first branch 341, a second branch 342 and a third branch 343. The second branch 342 is vertically connected to the middle of the first branch 341. One end of the third branch 343 is vertically connected to the middle of the second branch 342 to form a vertical point. The low-frequency feeding point 33 is arranged at the other end of the third branch 343. The inner layer of one end of the coaxial cable 32 is connected to the vertical point.

[0065] In this embodiment, the impedance of the feeding point is adjusted through the first branch 341, the second branch 342 and the third branch 343, and the current distribution and electromagnetic field pattern of the entire structure are affected, thereby achieving precise control of signal transmission and electromagnetic field pattern.

[0066] refer to Figure 1 and Figure 3 The second radiation patch 31 is a dipole patch, and the antenna has the advantages of compactness, easy integration, multi-band operation and optimized radiation characteristics.

[0067] In this embodiment, the frequency band of the second antenna unit 30 is 2.4 GHz-2.5 GHz.

[0068] refer to Figures 1 to 14 In summary, the dual-fed array antenna of the present invention has the advantages of strong tunability, high gain, high isolation and mass production, and is also suitable for a variety of application scenarios.

[0069] Obviously, the embodiments described above are only some of the embodiments of the present invention, rather than all of the embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present invention specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of protection of the present invention patent.

Claims

1. A dual-feed array antenna, characterized in that: It includes a PCB board, a first antenna unit, and a second antenna unit; the first antenna unit and the second antenna unit are both arranged on the PCB board; The first antenna unit includes a plurality of first radiating patches, an impedance transformation line, and a high-frequency feeding point. The plurality of first radiating patches are spaced apart in an array. One impedance transformation line is provided between every two first radiating patches. The first or last first radiating patch is connected to the high-frequency feeding point and is used to connect to the high-frequency feeding line. The second antenna unit is provided with a low frequency feeding point for connecting to a low frequency feed line.

2. The dual-feed array antenna according to claim 1, wherein: The first antenna unit is further provided with a reference ground branch; The high-frequency feeding point is provided on the first or last of the first radiation patches, and the first reference ground is provided on the reference ground branch.

3. The dual-feed array antenna according to claim 1, wherein: The middle portion of the impedance transformation line is in a serpentine bending state.

4. The dual-feed array antenna according to claim 1, wherein: The frequency band of the first antenna unit is 5.15 GHz-5.85 GHz.

5. The dual-feed array antenna according to claim 1, wherein: The second antenna unit also includes a plurality of second radiating bodies and coaxial cables. The plurality of second radiating bodies are distributed in an array, one coaxial cable is arranged between every two second radiating bodies, and the first or last second radiating body is connected to the low-frequency feeding point.

6. The dual-feed array antenna according to claim 5, characterized in that: The first radiation patch includes two radiation patches that are paired with each other; The inner and outer layers of one end of the coaxial cable are respectively connected to the two radiation patches of the second radiation patch.

7. The dual-feed array antenna according to claim 6, wherein: The second antenna unit further includes a T-shaped branch, wherein the T-shaped branch is provided between the two radiation patches of the first or last second radiation patch; The inner and outer layers of one end of the coaxial cable are respectively connected to the T-shaped branch and one of the radiating patches of the second radiating body. The low-frequency feeding point is provided on the T-shaped branch, and the other radiating patch of the second radiating body is correspondingly provided with a second reference ground. The second reference ground is used to cooperate with the low-frequency feeding point to connect the low-frequency feed line.

8. The dual-feed array antenna according to claim 7, wherein: The T-shaped branch includes a first branch, a second branch and a third branch, the second branch is vertically connected to the middle of the first branch, one end of the third branch is vertically connected to the middle of the second branch to form a vertical point, the low-frequency feeding point is arranged at the other end of the third branch, and the inner layer of one end of the coaxial cable is connected to the vertical point.

9. The dual-feed array antenna according to claim 5, wherein: The second radiation patch is a dipole patch.

10. The dual-feed array antenna according to claim 5, wherein: The frequency band of the second antenna unit is 2.4 GHz-2.5 GHz.

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