Miniature broadband dual-polarized antenna
By designing a small broadband dual-polarized antenna, using coupled orthogonal symmetrical dipoles and a reasonable balun circuit, the problem of achieving broadband and high gain in small antennas was solved, and broadband impedance matching and high gain performance were achieved under small aperture and low profile conditions.
Patent Information
- Application Number
- CN202422157974.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-03
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-09-03
AI Technical Summary
In the existing technology, it is difficult for small antennas to achieve broadband and high-gain performance, and designers need to make compromises between structural parameters and performance indicators.
The design includes a radiating surface, a balun assembly, and a reflector. The radiating surface consists of a PCB board and four intersecting vertical oscillator arms. Through coupled orthogonal symmetrical oscillators and a rationally designed balun circuit, broadband impedance matching is achieved, resulting in high gain and stable beamwidth with a small aperture and low profile.
Broadband impedance matching was achieved in a small antenna, providing high gain and stable beamwidth performance, thus meeting the design requirements for broadband and high gain.
Smart Images
Figure CN223527396U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to antenna technical field, especially a kind of small wideband dual-polarized antenna. BACKGROUND
[0002] In the antenna design process, its structure parameters and performance indicators often exist mutual restriction, such as the antenna with smaller size is difficult to realize wideband and high gain performance, and designer needs to optimize and compromise to antenna parameters according to actual situation;Therefore, it is very necessary to develop an antenna with good performance in all aspects. SUMMARY
[0003] The utility model aims at at least one of the technical problems existing in prior art is solved.For this purpose, the utility model provides a kind of small wideband dual-polarized antenna.
[0004] The technical scheme adopted by one embodiment of the utility model to solve its technical problem is as follows: a kind of small wideband dual-polarized antenna, including radiation surface, balun component and reflector plate;
[0005] Radiation surface includes PCB board and four dipole arms crossing in the center and perpendicular to each other on PCB board, two dipole arms located at opposite angles constitute first symmetrical dipole and second symmetrical dipole, and two adjacent dipole arms are close to each other to be coupled;
[0006] Reflector plate is arranged parallel below radiation surface;
[0007] Balun component is connected between radiation surface and reflector plate, and first feed circuit and second feed circuit are arranged on it, the top end of first feed circuit is connected with the center of first symmetrical dipole, and the bottom end is connected with signal transmission device, the top end of second feed circuit is connected with second symmetrical dipole, and the bottom end is connected with signal transmission device.
[0008] As one of the preferred embodiments of the utility model, balun component includes first balun and second balun perpendicular to each other, first feed circuit is arranged on first balun, and second feed circuit is arranged on second balun.
[0009] As one of the preferred embodiments of the utility model, a kind of small wideband dual-polarized antenna further includes lead plate between balun component and reflector plate, third feed circuit with the bottom end of first feed circuit connected and fourth feed circuit with the bottom end of second feed circuit connected are arranged on lead plate, and the first end of third feed circuit and the first end of fourth feed circuit are connected with signal transmission device.
[0010] As one of the preferred embodiments of the utility model, dipole arm is provided with a plurality of first bending lines on the side close to another dipole arm adjacent thereto.
[0011] As one of preferred embodiments of the utility model, the vibrator arm is provided with a plurality of second bending lines on the side far away from the other vibrator arm adjacent thereto.
[0012] As one of preferred embodiments of the utility model, the small-size broadband dual-polarized antenna further comprises a baffle plate arranged on the reflecting plate and enclosing the radiation surface and the periphery of the balun assembly.
[0013] As one of preferred embodiments of the utility model, the baffle plate is formed by inwardly folding the outer edge of the reflecting plate.
[0014] As one of preferred embodiments of the utility model, the aperture size of the radiation surface is 0.3λ0*0.3λ0, and λ0 is the center working frequency of the antenna.
[0015] The utility model discloses the beneficial effect: a small-size broadband dual-polarized antenna, including radiation surface, balun assembly and reflecting plate, the radiation surface includes PCB board and the four vibrator arms that are crossed in the center and perpendicular to each other on the PCB board, and the vibrator arm of diagonal position constitutes first symmetrical vibrator and second symmetrical vibrator, and the adjacent two vibrator arms are close to each other to carry out coupling, the reflecting plate is arranged in the below of the radiation surface in parallel, the balun assembly is connected between the radiation surface and the reflecting plate and is arranged with first feed circuit and second feed circuit on it, and the top end of first feed circuit is connected with the center of first symmetrical vibrator, and the bottom end is connected with signal transmission device, and the top end of second feed circuit is connected with second symmetrical vibrator, and the bottom end is connected with signal transmission device, through the orthogonal symmetrical vibrator of mutual coupling, and the reasonable design balun circuit, realize the wideband impedance matching performance under the condition of small aperture, low profile, and have certain high gain and stable beam width simultaneously. BRIEF DESCRIPTION OF DRAWINGS
[0016] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:
[0017] Figure 1 It is a structure schematic diagram of a small-size broadband dual-polarized antenna first embodiment;
[0018] Figure 2 It is a structure schematic diagram of a small-size broadband dual-polarized antenna second embodiment;
[0019] Figure 3 It is the S parameter performance diagram of a small-size broadband dual-polarized antenna first embodiment;
[0020] Figure 4 It is the directional diagram of a small-size broadband dual-polarized antenna first embodiment;
[0021] Figure 5 It is the S parameter performance diagram of a small-size broadband dual-polarized antenna second embodiment;
[0022] Figure 6 Pattern of a second embodiment of a small wideband dual-polarized antenna. DETAILED DESCRIPTION
[0023] This part will describe the specific embodiments of the utility model in detail, the preferred embodiments of the utility model are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.
[0024] In the description of the utility model, the meaning of multiple is two or more, greater than, less than, more than, etc.
[0025] In the description of the utility model, it is understood that, in relation to the description of the direction, for example, the direction or position relationship indicated by up, down, front, back, left, right, etc.
[0026] In the utility model, unless otherwise explicitly limited, the words such as '' setting'', '' installing'', '' connecting'' should be understood broadly, for example, it can be directly connected, also can be indirectly connected through intermediate medium, can be fixedly connected, also can be detachably connected, can be integrally formed, can be mechanically connected, can be the communication or interaction relationship of two elements inside two elements.
[0027] Reference Figures 1-2 As a first embodiment of the utility model, a small wideband dual-polarized antenna comprises a radiation surface 100, a balun assembly 200 and a reflector plate 300.
[0028] Specifically, the radiation surface 100 includes a PCB board 110 and four vibrator arms crossing in the center and perpendicular to each other on the PCB board 110, two vibrator arms located at opposite angles form a first symmetrical vibrator 120 (a first vibrator arm 121 and a second vibrator arm 122) and a second symmetrical vibrator 130 (a third vibrator arm 131 and a fourth vibrator arm 132), and two adjacent vibrator arms are close to each other for coupling; further, the first vibrator arm 121, the second vibrator arm 122, the third vibrator arm 131 and the fourth vibrator arm 132 have the same square shape, each vibrator arm has one adjacent vibrator arm on each side, and two adjacent vibrator arms have a pair of parallel square sides close to each other, the first symmetrical vibrator 120 and the second symmetrical vibrator 130 are coupled to each other through the parallel square sides close to each other, and the coupling can expand the impedance bandwidth of the antenna.
[0029] In one embodiment, the vibrator arm is provided with a plurality of first bending lines 510 on the side close to the adjacent vibrator arm; and the vibrator arm is provided with a plurality of second bending lines 520 on the side away from the adjacent vibrator arm; not only the impedance matching can be improved, but also longer vibrator arms can be accommodated in a limited aperture, and the antenna can work at a lower frequency with a smaller aperture.
[0030] In the balun assembly 200, the balun assembly 200 is perpendicular to the radiation surface 100 and located below the radiation surface 100, as preferred, the balun assembly 200 is connected between the radiation surface 100 and the reflector plate 300 and is provided with a first feeding circuit and a second feeding circuit, the top end of the first feeding circuit is connected to the center of the first symmetrical vibrator 120, and the bottom end is connected to a signal transmission device, the top end of the second feeding circuit is connected to the second symmetrical vibrator 130, and the bottom end is connected to the signal transmission device, so as to realize the feeding of the two symmetrical vibrators, wherein the signal transmission device is preferably a phase shifter; in a further embodiment, the balun assembly 200 includes a first balun 210 and a second balun 220 perpendicular to each other, the first feeding circuit is arranged on the first balun 210, and the second feeding circuit is arranged on the second balun 220; the feeding circuit on the balun assembly 200 can be various possible forms, the feeding circuit adopts a design of microstrip line to slot line, so as to realize wideband impedance matching, and also can convert the unbalanced circuit at the bottom end signal feeding end of the balun assembly 200 into a balanced circuit, so as to realize the feeding of the symmetrical vibrator at the top end of the balun assembly 200, and at the same time, the feeding circuit can help the antenna to realize wideband impedance matching.
[0031] In one embodiment, the small broadband dual-polarized antenna further comprises a lead plate 400 arranged between the balun assembly 200 and the reflector plate 300, the lead plate 400 is provided with a third feed circuit having a bottom end connected to the first feed circuit and a fourth feed circuit having a bottom end connected to the second feed circuit, and a top end of the third feed circuit and a top end of the fourth feed circuit are connected to the signal transmission device; the lead plate 400 is arranged below and perpendicular to the balun assembly 200, each feed circuit on the lead plate 400 is a microstrip circuit and a start end is used for signal feeding, and then the balun assembly 200 is used for feeding; the lead plate 400 is located in a horizontal plane, and the feed circuits thereon can be specifically designed according to actual application to realize more functions, such as realizing separate processing of dual-polarized signals or signal combining of multiple antenna units.
[0032] The reflector plate 300 is a metal plate arranged at the lowest part of the entire antenna structure, below and close to the lead plate 400, parallel to the radiating surface 100, and can reflect antenna signals to realize high-gain directional radiation, and various structures can be designed on the reflector plate 400 to realize auxiliary adjustment of antenna performance, such as reducing beam width, improving gain and improving impedance matching.
[0033] Referring to Figures 1-2 , the aperture size of the radiating surface 100 is 0.3λ0*0.3λ0, and the antenna profile height is 0.17λ0, wherein λ0 is the center working frequency of the antenna; referring to Figure 3 , Figure 3 The S-parameter performance of the antenna in the first embodiment (without the baffle 600) of the utility model is shown, and it can be seen from Figure 3 that in the frequency range of 560MHz-880MHz, the return loss of the dual-polarized port of the antenna is less than 10dB, the isolation between the two ports is more than 30dB, the impedance bandwidth of the antenna reaches 45%, wideband impedance matching is realized, and the isolation within the working frequency range is good; referring to Figure 4 , the pattern performance of the antenna in the first embodiment of the utility model is shown, and it can be seen from Figure 4 that in the working frequency range, the antenna gain is more than 8.7dB i, and the half-power beam width is in the range of 66°±2.5°, and the provided antenna has high gain and stable half-power beam width performance.
[0034] Referring to Figure 2As the second embodiment of the utility model, in the embodiment, a small broadband dual-polarized antenna further comprises a baffle 600 arranged on the reflecting plate 300 and enclosing the radiation surface 100 and the balun assembly 200, the baffle 600 is connected with the reflecting plate 300, the height of the baffle 600 is 0.08 lambda 0, at the same time, the area of the reflecting plate 300 is reduced by 50%, as the preferred embodiment of the baffle 600, the baffle 600 is formed by inwardly folding the outer edge of the reflecting plate 300, which can be integrally stamped and formed, or integrally punched and formed after bending.
[0035] Referring to Figure 5 , Figure 5 The S parameter performance of the antenna in the second embodiment of the utility model is shown, by Figure 5 It can be seen that in the frequency range of 560MHz-880MHz, the return loss of the dual-polarized port of the antenna is less than 10dB, the isolation between the two ports is more than 30dB, the S parameter performance of the antenna is similar to that of the antenna in the first embodiment of the utility model, has a wide impedance bandwidth of 45% and high isolation between orthogonal polarization ports; referring to Figure 6 , Figure 6 The pattern performance of the antenna in the second embodiment of the utility model is shown, by Figure 6 It can be seen that in the working frequency range, the antenna gain is more than 8dB i, the half-power beamwidth is in the range of 65.5°±7.5°, the antenna has high gain and stable half-power beamwidth performance; on the basis of the first embodiment of the utility model, by adding the baffle 600 around the reflecting plate 300, the area of the reflecting plate 300 can be reduced, thereby reducing the volume, weight and cost of the antenna, at the same time, the antenna still has the performance of small aperture, low profile, wide bandwidth and high gain.
[0036] The utility model has the advantages that by adopting the mutually coupled orthogonal symmetrical dipoles and reasonably designing the balun circuit, the wideband impedance matching performance is realized under the condition of small aperture and low profile, at the same time, certain high gain and stable beamwidth are also achieved.
[0037] Of course, the utility model is not limited to the above-mentioned embodiments, those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the utility model, and these equivalent modifications and replacements are all included in the range defined by the claims of the present application.
Claims
1. A compact broadband dual-polarized antenna, characterized by: The antenna comprises a radiation surface (100), a balun assembly (200) and a reflecting plate (300); The radiation surface (100) comprises a PCB board (110) and four vibrator arms crossing at the center and perpendicular to each other on the PCB board (110), two diagonally located vibrator arms constitute a first symmetric vibrator (120) and a second symmetric vibrator (130), and two adjacent vibrator arms are close to each other for coupling. The reflecting plate (300) is arranged in parallel below the radiation surface (100). The balun assembly (200) is connected between the radiation surface (100) and the reflecting plate (300) and is provided with a first feeding circuit and a second feeding circuit, the top end of the first feeding circuit is connected with the center of the first symmetric vibrator (120), and the bottom end is connected with a signal transmission device, and the top end of the second feeding circuit is connected with the second symmetric vibrator (130), and the bottom end is connected with a signal transmission device.
2. The compact wideband dual-polarized antenna according to claim 1, characterized in that: The balun assembly (200) comprises a first balun (210) and a second balun (220) perpendicular to each other, the first feeding circuit is arranged on the first balun (210), and the second feeding circuit is arranged on the second balun (220).
3. The compact wideband dual-polarized antenna according to claim 1, characterized in that: Further comprising a lead plate (400) arranged between the balun assembly (200) and the reflecting plate (300), the lead plate (400) is provided with a third feeding circuit with the bottom end connected with the first feeding circuit and a fourth feeding circuit with the bottom end connected with the second feeding circuit, and the top end of the third feeding circuit and the top end of the fourth feeding circuit are connected with a signal transmission device.
4. The compact wideband dual-polarized antenna according to claim 1, characterized in that: The vibrator arm is provided with a plurality of first bending lines (510) on one side close to another vibrator arm adjacent thereto.
5. The compact wideband dual-polarized antenna according to claim 1, characterized in that: The vibrator arm is provided with a plurality of second bending lines (520) on one side away from another vibrator arm adjacent thereto.
6. The compact wideband dual-polarized antenna of claim 1, wherein: Further comprising a baffle (600) arranged on the reflecting plate (300) and enclosing the radiation surface (100) and the balun assembly (200) on the side.
7. The compact wideband dual-polarized antenna according to claim 6, characterized in that: The baffle (600) is formed by inwardly folding the outer edge of the reflecting plate (300).
8. The compact wideband dual-polarized antenna of claim 1, wherein: The aperture size of the radiation surface (100) is 0.3λ0×0.3λ0, and λ0 is the center operating frequency of the antenna.