Meteoric metal dipole filter antenna

Abstract

The application provides a meter-wave metal dipole filter antenna, and relates to the technical field of filter antennas. The filter antenna comprises an antenna array, an air plate line feed balun and a filter. The antenna array is symmetrically fixed to two ends of the top of the air plate line feed balun, and the air plate line feed balun is integrally connected to the upper surface of the filter. The feed balun in the form of an air plate line structure is integrated with the filter. Compared with the assembly or integration of a traditional antenna and a filter without the air plate line structure, the structure can further improve the harmonic suppression degree of the antenna on the basis of ensuring the performance of the antenna, thereby improving the anti-interference performance and electromagnetic compatibility performance of the antenna.

Description

Technical Field

[0001] This invention relates to the technical field of filter antennas, and specifically to a meter-wave metal dipole filter antenna. Background Technology

[0002] With the rapid development of communication, radar, and electronic warfare equipment, and the widespread application of reconnaissance and counter-reconnaissance, jamming and counter-jamming technologies, shipborne, airborne, and vehicle-mounted platforms are operating in increasingly complex electromagnetic environments. Antennas operating on a single frequency band on large combat platforms are no longer viable; multiple frequency band antennas are now prevalent, leading to severe interference between them. To ensure antennas function properly in harsh electromagnetic environments, it is necessary to improve their own anti-jamming capabilities and reduce pollution to the surrounding electromagnetic environment.

[0003] Integrating antennas and filters is an important way to solve electromagnetic compatibility (EMC) problems. The antenna's function is to receive and transmit electromagnetic signals and perform spatial filtering. The filter's function is to suppress out-of-band clutter and filter out interference signals. Traditionally, antennas and filters are two separate devices that require assembly and matching during use. Newer filtering antennas integrate the antenna and filter into a single, independent device that performs both antenna and filter functions.

[0004] However, existing integrated filter antennas still suffer from weak harmonic interference suppression and poor electromagnetic compatibility. Therefore, it is necessary to develop a novel filter antenna structure that can effectively improve harmonic interference suppression and electromagnetic compatibility. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a meter-wave metal dipole filter antenna, which solves the problems of weak anti-interference capability and poor electromagnetic compatibility of existing antennas.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A meter-wave metallic dipole filter antenna includes an antenna array, an air-plate wire-fed balun, and a filter. The antenna array is symmetrically fixed at both ends of the top of the air-plate wire-fed balun, and the air-plate wire-fed balun is integrally connected to the upper surface of the filter.

[0010] Preferably, the air plate line feed balun includes an inner conductor and an outer conductor, the outer conductor includes a left outer conductor and a right outer conductor, and the inner conductor is located between the left and right outer conductors.

[0011] Preferably, there is an air matching gap between the left outer conductor of the feed balun and the right outer conductor of the feed balun.

[0012] Preferably, the filter includes a cavity, a resonator, and an RF coaxial connector, wherein the RF coaxial connector is directly coupled to the filter for power supply.

[0013] Preferably, the resonator includes a coaxial resonant rod with one end fixed to the inner wall of the cavity and placed horizontally, a tuning rod inserted into the coaxial resonant rod and placed horizontally, and a dielectric ring surrounding the tuning rod.

[0014] Preferably, the coaxial resonant rod and the radio frequency coaxial connector are connected to the cavity by fixing screws.

[0015] Preferably, the resonant rods include, from top to bottom, a first tuning rod, a second tuning rod, a third tuning rod, and a fourth tuning rod. The length of the first tuning rod is 60mm ± 3mm, the length of the second tuning rod is 55mm ± 3mm, the length of the third tuning rod is 55mm ± 3mm, and the length of the fourth tuning rod is 60mm ± 3mm.

[0016] Preferably, the inner conductor of the feed balun is connected to the coaxial resonant rod via a metal connecting rod.

[0017] Preferably, a medium support is provided between the metal connecting rod and the cavity.

[0018] Preferably, the free space wavelength corresponding to the antenna center frequency is represented by λ0, the antenna height is λ0 / 4, and the antenna element length is λ0 / 2.

[0019] (III) Beneficial Effects

[0020] This invention provides a meter-wave metallic dipole filter antenna. Compared with the prior art, it has the following advantages:

[0021] The integrated design of the feed balun and filter using an air-plate wire structure, compared to the traditional assembly or integration of antennas and filters without an air-plate wire structure, can further improve the antenna's harmonic suppression while ensuring its own performance, thereby improving the antenna's anti-interference performance and electromagnetic compatibility performance. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the antenna in Embodiment 1 and Embodiment 2;

[0024] Figure 2 These are schematic diagrams of the antenna cross-sectional structure of Embodiments 1 and 2 of the present invention;

[0025] Figure 3 These are schematic diagrams of the internal structure of the filters in Embodiments 1 and 2 of the present invention;

[0026] Figure 4 The insertion loss and suppression characteristic curves of the filter in Embodiment 2 of the present invention are shown.

[0027] The components include: 1. Antenna array; 2. Air-board wire-fed balun; 21. Inner conductor of the balun; 22. Outer conductor of the balun; 221. Left outer conductor of the balun; 222. Right outer conductor of the balun; 3. Filter; 31. Cavity; 32. Resonator; 321. Coaxial resonator rod; 322. Tuning rod; 3221. First tuning rod; 3222. Second tuning rod; 3223. Third tuning rod; 3224. Fourth tuning rod; 323. Dielectric ring; 33. RF coaxial connector; 4. Fixing screw; 5. Air matching gap; 6. Metal connecting rod; 7. Dielectric support. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This application provides a meter-wave metal dipole filter antenna, which solves the problems of weak anti-interference capability and poor electromagnetic compatibility of existing antennas, and realizes a filter integration design for meter-wave band antennas that not only meets the antenna's own performance requirements but also has excellent anti-interference performance.

[0030] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0031] Example 1

[0032] like Figure 1 As shown, the meter-wave metal dipole filter antenna includes antenna element 1, air plate wire-fed balun 2, and filter 3.

[0033] like Figure 1 As shown, antenna element 1 consists of two metal elements, symmetrically fixed on both sides of the top of the air-plate wire-fed balun 2, used to guide and amplify electromagnetic waves and enhance the electromagnetic signals received by the antenna. The antenna is in the form of a metal dipole, and the free space wavelength corresponding to the antenna center frequency is denoted by λ0. The antenna height (including the bottom filter 3) is λ0 / 4, and the length of antenna element 1 is λ0 / 2.

[0034] The air-plate wire fed balun 2 is a fed balun using an air-plate wire configuration. It includes an inner conductor 21 and an outer conductor 22. The outer conductor 22 consists of a left outer conductor 221 and a right outer conductor 222. Both the left and right outer conductors are inverted L-shaped, with the inner conductor 21 positioned between them. An air matching gap 5 exists between the top ends of the left and right outer conductors 221 and 222. Adjusting the size of this air matching gap 5 according to actual operating conditions improves antenna efficiency.

[0035] Filter 3 is located at the bottom of air-board wire-fed balun 2 and is integrally connected to it. Air-board wire-fed balun 2 is mounted at one end of the length of filter 3. Filter 3 includes cavity 31, resonators 32, and RF coaxial connector 33. Four resonators 32 are located inside cavity 31 and are coupled sequentially. Coupling between resonators 32 is achieved by adjusting the distance between them. RF coaxial connector 33 is located on the bottom surface of cavity 31. The original coupling parameter model of filter 3 uses Chebyshev functions, and filter 3 has advantages such as equal ripple in the passband, steep edges, and no transmission zeros.

[0036] The resonator 32 includes a coaxial resonant rod 321, a tuning rod 322, and a dielectric ring 323.

[0037] There are four coaxial resonant rods 321, which are placed horizontally inside the cavity 31 from top to bottom. One end of the coaxial resonant rod 321 is fixed to the inner wall of the cavity 31 by a fixing screw 4, and the end face of the other end is provided with a groove that extends into the cavity along the length of the coaxial resonant rod 321.

[0038] There are four tuning rods 322, which are located in the grooves of the four coaxial resonant rods 321. The four tuning rods 322 are, from top to bottom, the first tuning rod 3221, the second tuning rod 3222, the third tuning rod 3223, and the fourth tuning rod 3224.

[0039] There are four dielectric rings 323, which are respectively wrapped around the four tuning rods 322. The dielectric rings 323 are used to improve the Q factor of the filter 3, so as to improve the performance of the filter 3.

[0040] A metal connecting rod 6 is connected to the bottom of the inner conductor 21 of the feed balun. The metal connecting rod 6 extends from the inside of the air plate wire feed balun 2 into the inside of the filter 3. The end of the metal connecting rod 6 away from the inner conductor 21 of the feed balun is fixedly connected to the upper surface of the uppermost coaxial resonant rod 321. A dielectric support 7 is provided between the metal connecting rod 6 and the cavity 31. The dielectric support 7 is used to fix the metal connecting rod 6 to the cavity 31 to improve the fixation stability of the metal connecting rod 6.

[0041] The implementation principle of this invention is as follows: The feed balun with an air plate wire structure has the advantage of increased operating bandwidth. By integrating this type of feed balun with the filter 3, compared with the traditional assembly or integration of the antenna and filter 3 without an air plate wire structure, this structure can further improve the antenna's harmonic suppression while ensuring the antenna's own performance, thereby improving the antenna's anti-interference performance and electromagnetic compatibility performance.

[0042] Example 2

[0043] The antenna structure in this embodiment is the same as that in Embodiment 1, except that the dimensions of the antenna and its structure are further defined. The filter antenna fabricated using the dimensions defined in this embodiment exhibits excellent anti-interference performance and electromagnetic compatibility. The specific dimensions of the antenna and its structure are as follows:

[0044] The antenna height (including the bottom filter 3) is 300mm;

[0045] Antenna element 1 has a length of 560mm;

[0046] The inner conductor 21 of the power supply balun has a thickness of 7 mm, a width of 11 mm, and a height of 183 mm.

[0047] The four coaxial resonant rods 321 are identical in size, with a length of 93mm, an inner diameter of 6mm, and an outer diameter of 8.5mm.

[0048] The four tuning levers 322 have different dimensions: the first tuning lever 3221 is 59mm long, the second tuning lever 3222 is 53mm long, the third tuning lever 3223 is 53mm long, and the fourth tuning lever 3224 is 59mm long. The diameter of all four tuning levers 322 is 4.4mm.

[0049] The four dielectric rings are identical in size, made of polytetrafluoroethylene, with a length of 70 mm, an inner diameter of 4.4 mm, and an outer diameter of 6 mm.

[0050] according to Figure 4 It can be seen that the insertion loss is less than 0.2dB in the passband, the suppression is greater than 45dB in the 400MHz to 1400MHz frequency band, and the suppression is greater than 50dB in the S-band of 2500MHz to 3150MHz.

[0051] In summary, compared with existing technologies, it has the following beneficial effects:

[0052] 1. The integrated design of the feed balun and filter adopts an air-plate wire structure. Compared with the traditional assembly or integration of antennas and filters without an air-plate wire structure, this structure can further improve the antenna's harmonic suppression while ensuring the antenna's own performance, thereby improving the antenna's anti-interference performance and electromagnetic compatibility performance.

[0053] 2. The manufactured filter antenna has a compact overall structure, high system reliability, meets miniaturization requirements, and reduces system production costs.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A meter wave metal dipole filter antenna, characterized by, It includes an antenna array (1), an air plate wire feed balun (2), and a filter (3). The antenna array (1) is symmetrically fixed at both ends of the top of the air plate wire feed balun (2), and the air plate wire feed balun (2) is integrally connected to the upper surface of the filter (3). The air plate wire feeding balun (2) includes an inner conductor (21) and an outer conductor (22). The outer conductor (22) includes an inverted L-shaped left outer conductor (221) and a right outer conductor (222). The inner conductor (21) is located between the left outer conductor (221) and the right outer conductor (222). An air matching gap (5) exists between the top of the left outer conductor (221) of the power supply balun and the top of the right outer conductor (222) of the power supply balun.

2. A meter wave metal dipole filter antenna as claimed in claim 1, characterized in that, The filter (3) includes a cavity (31), a resonator (32), and an RF coaxial connector (33), which is directly coupled to the filter (3) for power supply.

3. A meter wave metal dipole filter antenna as claimed in claim 2, characterized in that The resonator (32) includes a coaxial resonant rod (321) with one end fixed to the inner wall of the cavity (31) and placed horizontally, a tuning rod (322) inserted into the coaxial resonant rod (321) and placed horizontally, and a dielectric ring (323) surrounding the tuning rod (322).

4. A meter wave metal dipole filter antenna as claimed in claim 3, characterized in that The coaxial resonant rod (321) and the radio frequency coaxial connector (33) are connected to the cavity (31) by fixing screws (4).

5. A meter wave metal dipole filter antenna as claimed in claim 3, characterized in that, The resonant rods, from top to bottom, include a first tuning rod (3221), a second tuning rod (3222), a third tuning rod (3223), and a fourth tuning rod (3224). The length of the first tuning rod (3221) is 60mm ± 3mm, the length of the second tuning rod (3222) is 55mm ± 3mm, the length of the third tuning rod (3223) is 55mm ± 3mm, and the length of the fourth tuning rod (3224) is 60mm ± 3mm.

6. A meter wave metal dipole filter antenna as claimed in claim 3, characterized in that, The inner conductor (21) of the feed balun is connected to the coaxial resonant rod (321) via a metal connecting rod (6).

7. A meter-wave metallic dipole filter antenna as described in claim 6, characterized in that, A medium support (7) is provided between the metal connecting rod (6) and the cavity (31).

8. A meter-wave metal dipole filter antenna as claimed in claim 1, characterized in that, The free space wavelength corresponding to the antenna center frequency is denoted by , the antenna height by , and the antenna element (1) length by .

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