Cross-coupled microstrip filtering oscillator antenna and array thereof

Abstract

The invention provides a cross coupling microstrip filtering oscillator antenna and an array thereof, and belongs to the field of large phased array radar systems.The cross coupling microstrip filtering oscillator antenna comprises an antenna feed port, a reflecting plate, a suspended cross coupling microstrip circuit board, a filter cover plate and metal oscillator arms, the filter cover plate is located on the upper surface of the reflecting plate, and a suspended air cavity is defined by the filter cover plate and the reflecting plate; the suspended cross-coupled microstrip circuit board is located in the suspended air cavity, an inner conductor of the antenna feed port extends into the suspended air cavity to be connected with the suspended cross-coupled microstrip circuit board, an outer conductor of the antenna feed port is connected with the reflecting plate, and the metal oscillator arm is located on the filter cover plate. One radiation arm in the metal oscillator arms is connected with the suspended cross-coupled microstrip circuit board, and the other radiation arm is grounded; the radiation characteristic is directly realized on the filter cover plate, and a wider working bandwidth is realized under the conditions that the lower sideband of the suspended broadband high-pass filter is high in suppression, the original filtering performance of the filter is not changed and the profile height is basically kept, so that the problem of interference of an auxiliary radar on a main radar is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of large-scale phased array radar system, microwave communication and satellite communication system, and in particular to a cross-coupled microstrip filter oscillator antenna and an array thereof. Background Art

[0002] In the prior art, especially in centimeter-wave frequency bands and large-scale high-power phased array radar systems, in order to eliminate the interference of auxiliary radars to the main radar, a high-pass or band-pass filter is generally installed in the main radar antenna feed system (between DAM and antenna). The filter and the antenna are important components at the front end of the radar array. They are both structural parts and related to the frequency. The volume of the filter is also related to factors such as the operating frequency, working bandwidth, suppression degree, and power resistance. The more radar channels there are, the larger the volume and weight of the filter will be in the antenna feed system, which will greatly affect the maneuverability of the radar and increase the loss. The higher the suppression degree requirement, the greater the loss. Some systems even add a cable connection between the filter and the antenna, which has an impact on the loss and weight of the system that cannot be ignored. The present invention is a cross-coupled microstrip filter oscillator antenna developed to solve the problem of interference of auxiliary radars to the main radar in centimeter-wave frequency bands and digital phased array radar systems. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a cross-coupled microstrip filter dipole antenna, which solves the interference problem of the auxiliary radar to the main radar in the digital phased array radar system without adding additional filter structures and matching circuits.

[0004] The present invention solves the above technical problems through the following technical solutions: a cross-coupled microstrip filter dipole antenna, comprising an antenna feed port, a reflector, a suspended cross-coupled microstrip circuit board, a filter cover, and a metal dipole arm, wherein the filter cover is located on the upper surface of the reflector and is enclosed with the reflector to form a suspended air cavity, the suspended cross-coupled microstrip circuit board is located in the suspended air cavity, the inner conductor of the antenna feed port extends into the suspended air cavity and is connected to the suspended cross-coupled microstrip circuit board, the outer conductor of the antenna feed port is connected to the reflector, the metal dipole arm is located on the filter cover, one radiating arm in the metal dipole arm is connected to the suspended cross-coupled microstrip circuit board, and the other radiating arm in the metal dipole arm is grounded.

[0005] The present invention embeds an antenna unit on the cover of a cross-coupled broadband high-pass filter, that is, a balanced-unbalanced feeding structure and a metal dipole arm are derived and designed on the outer shell of a metal cavity of the high-pass filter. The balanced-unbalanced feeding structure is used for wide-sweep impedance matching, and the metal dipole arm is used for electromagnetic wave radiation. The radiation characteristics are directly realized on the cover of the suspended broadband high-pass filter, and the high suppression of the lower sideband of the suspended broadband high-pass filter is utilized. Without changing the original filtering performance of the high-pass filter and basically maintaining the profile height, the broadband working characteristics of the antenna are met, a wider working bandwidth than the coaxial cavity bandpass filter is achieved, and the function of radiating electromagnetic waves to the outside is increased. Compared with the traditional connection of a radio frequency cable assembly between the antenna unit and the filter, when the auxiliary radar frequency is suppressed by 50 dB, the system loss can be reduced by 0.5 dB, and the shared profile height of the physical size is reduced by about one-fourth of the wavelength of the lowest frequency.

[0006] Preferably, the metal vibrator arm is parasitic on the side wall of the filter cover, and the distance between the metal vibrator arm and the reflector is a quarter wavelength at low frequency.

[0007] Preferably, the suspended cross-coupled microstrip circuit board includes a high-frequency microstrip dielectric board, a main circuit is etched on the front side of the high-frequency microstrip dielectric board, and a cross-coupling circuit is etched on the back side, one end of the main circuit is connected to a radiating arm in the metal dipole arm, and the other end of the main circuit is connected to the inner conductor of the antenna feed port.

[0008] Preferably, the dielectric constant of the high-frequency microstrip dielectric plate is 2.94, and the vertical height between the metal dipole arm and the upper surface of the reflector is 30.3 mm.

[0009] Preferably, the main circuit adopts the form of series capacitors and parallel inductors on the front side of the high-frequency microstrip dielectric board, and the cross-coupling circuit adopts two SIR step capacitors and inductors in parallel to couple with the main circuit to achieve cross-coupling and form a transmission zero point.

[0010] Preferably, the antenna feed port is a probe or a connector, and the characteristic impedance of the feed port is 50 ohms. When the antenna feed port is a connector, the inner conductor of the connector extends into the suspended air cavity and is connected to the main circuit to feed the oscillator antenna, and the outer conductor of the connector is connected to the reflector to achieve grounding.

[0011] Preferably, another radiation arm in the metal dipole arm is connected to a reflection plate via a U-shaped choke slot to achieve grounding.

[0012] Preferably, the metal vibrator arm is in a straight line or an umbrella shape. When in a straight line, the metal vibrator arm is vertically fixed on the filter cover. When in an umbrella shape, the metal vibrator arm is fixed on the filter cover at an angle relative to the mounting surface of the filter cover.

[0013] The present invention also provides a cross-coupled microstrip filter oscillator antenna array, which is composed of a plurality of the cross-coupled microstrip filter oscillator antennas to form an M×N or N×M element antenna array, M≥N, and isolation rods are arranged between adjacent oscillator antennas arranged in the array along the Y direction, and the isolation rods are fixed on the upper surface of the reflecting plate.

[0014] Preferably, an integrated antenna cover is provided above each oscillator antenna.

[0015] The advantages provided by the present invention are:

[0016] (1) The present invention embeds an antenna unit on the cover of a cross-coupled broadband high-pass filter, that is, a balanced-unbalanced feeding structure and a metal dipole arm are derived and designed on the outer shell of the metal cavity of the high-pass filter. The balanced-unbalanced feeding structure is used for wide-sweep impedance matching, and the metal dipole arm is used for electromagnetic wave radiation. The radiation characteristics are directly realized on the cover of the suspended broadband high-pass filter, and the high suppression of the lower sideband of the suspended broadband high-pass filter is utilized. Without changing the original filtering performance of the high-pass filter and basically maintaining the profile height, the broadband working characteristics of the antenna are met, a wider working bandwidth than the coaxial cavity bandpass filter is achieved, and the function of radiating electromagnetic waves to the outside is increased. Compared with the traditional RF cable assembly connection between the antenna unit and the filter, when the auxiliary radar frequency is suppressed by 50 dB, the system loss can be reduced by 0.5 dB, and the physical size sharing profile height is reduced by about one-fourth of the wavelength of the lowest frequency.

[0017] (2) The present invention mainly aims at the high suppression of the upper near-zone spurious band, and realizes the low profile and high-efficiency radiation of the phased array radar system. The cavity structure of the filter is fully utilized, and the two radiating arms of the vibrator antenna are nested in the cross-coupled high-pass filter housing to realize the integrated design of the antenna and the filter, forming a cross-coupled high-performance filter vibrator antenna. The low-loss high-suppression high-pass suspension filter, the antenna vibrator radiating arm, the antenna cover, etc. are integrated into an integrated design. The entire antenna profile height is only half of the original system design height. This height can meet both the radiation conditions of the vibrator antenna and the cavity size requirements of the high-pass filter, that is, the two structural devices share the same height. In terms of electrical performance, it not only meets the efficient radiation of the antenna unit, but also solves the interference problem of the auxiliary radar on the main radar antenna. The cross-coupled microstrip filter vibrator antenna provides inherent favorable hardware conditions for reducing the overall weight of the structure, reducing the profile height of the radar system, simplifying the radar system architecture, and improving the system integration and the radiation efficiency of the whole machine.

[0018] (3) The antenna feed port of the present invention adopts a connector, and the oscillator antenna is directly blindly connected to the DAM component or the SUM component through the connector, so as to realize the rapid plug-in and pull-out and integrated connection of the single-channel antenna, greatly simplify the composition of the array microwave device, reduce the number of cables and connectors, and the structural support and heat dissipation equipment of the filter, so as to improve the system reliability, realize modularization and expandability, and facilitate the automatic retraction and expansion of the antenna array, and meet the high mobility requirements of shipborne and airborne radars.

[0019] (4) The dipole antenna of the present invention directly mounts the filter and the antenna above the reflector, utilizing space to efficiently dissipate heat naturally without the need for an additional heat dissipation structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a cross-coupled microstrip filter dipole antenna provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the position of a suspended cross-coupled microstrip circuit board in a cross-coupled microstrip filter dipole antenna provided in an embodiment of the present invention;

[0022] Figure 3 A front schematic diagram of a suspended cross-coupled microstrip circuit board in a cross-coupled microstrip filter dipole antenna provided in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the reverse side of a suspended cross-coupled microstrip circuit board in a cross-coupled microstrip filter dipole antenna provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of a 5×5 array of cross-coupled microstrip filter dipole antennas provided in an embodiment of the present invention;

[0025] Figure 6 A standing wave diagram of a filter circuit of a cross-coupled microstrip filter dipole antenna provided in an embodiment of the present invention;

[0026] Figure 7 A filtering effect diagram of the cross-coupled microstrip filter dipole antenna provided in an embodiment of the present invention;

[0027] Figure 8 A gain diagram of a cross-coupled microstrip filter dipole antenna provided by an embodiment of the present invention;

[0028] Fig. 9 The lobe diagram of the cross-coupled microstrip filter dipole antenna provided by the embodiment of the present invention;

[0029] In the figure: 1 antenna feed port, 2 reflector, 3 suspended air cavity, 4 suspended cross-coupled microstrip circuit board, 41 main circuit, 42 cross-coupling circuit, 5 filter cover, 6 metal dipole arm, 7 isolation rod, 8 integrated antenna cover. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] As we all know, antennas and filters are the two most important components in RF front-end circuits. Traditional design methods only focus on the design of the device itself. After the two are cascaded in the system, they cannot guarantee complete matching, and the circuit size is large. Designing the antenna and filter as a whole device into a filter antenna not only has the functions of radiation, impedance matching, filtering and balanced conversion, but also can reduce the circuit size and make the system structure more compact, which has important practical value.

[0032] The filter synthesis method is still applicable in the design of cross-coupled microstrip filter vibrator antennas. In recent years, it has attracted the research and attention of many scholars. In public data, reports on isolated microstrip antenna units and microstrip filters designed on the same PCB board or layered designs on multi-layer PCB boards can be seen, but there are no reports on the integration of metal vibrator antennas and cross-coupled filters. After direct cascading, the antenna reflection coefficient is poor, the two components are not completely matched, the loss is large, and the near-zone spurious is difficult to be effectively suppressed. It is difficult to meet the demanding engineering use requirements. In order to meet the engineering application requirements, the present invention provides a cross-coupled microstrip filter vibrator antenna. The specific scheme is introduced as follows:

[0033] like Figure 1 and Figure 2 As shown, this embodiment provides a cross-coupled microstrip filter dipole antenna, including an antenna feed port 1, a reflector 2, a suspended cross-coupled microstrip circuit board 4, a filter cover 5, and a metal dipole arm 6. The filter cover 5 is located on the upper surface of the reflector 2 and is enclosed with the reflector 2 to form a suspended air cavity 3. The suspended cross-coupled microstrip circuit board 4 is located in the suspended air cavity 3. The inner conductor of the antenna feed port 1 extends into the suspended air cavity 3 and is connected to the suspended cross-coupled microstrip circuit board 4. The outer conductor of the antenna feed port 1 is connected to the reflector 2. The metal dipole arm 6 is located on the filter cover 5. One of the radiating arms in the metal dipole arm 6 is connected to the suspended cross-coupled microstrip circuit board 4, and the other radiating arm in the metal dipole arm 6 is grounded.

[0034] The cross-coupled microstrip filter antenna of the present invention is suitable for working in the upper sideband of the auxiliary radar and is suitable for radar systems with a wide working frequency band. The suppression of the auxiliary radar is as high as 50dB or more. The metal antenna arm 6 is parasitic on the side wall of the filter cover 5. The structural size of the cross-coupled microstrip filter is used to meet the electrical size of a low-frequency quarter wavelength between the antenna and the reflector, so as to achieve the best radiation conditions and form an integrated cross-coupled microstrip filter antenna.

[0035] The filter cover plate 5 of the present invention is equivalent to two pieces, each of which has a radiation arm. When the suspended cross-coupled microstrip circuit board 4 and the filter cover plate 5 are assembled, the suspended cross-coupled microstrip circuit board 4 is pressed between the two cover plates, and the two ends of the suspended cross-coupled microstrip circuit board 4 are respectively pressed on the ends of the two cover plates.

[0036] like Figure 3 and Figure 4 As shown, the suspended cross-coupled microstrip circuit board 4 includes a high-frequency microstrip dielectric board, and a filter circuit is etched on the front and back sides of the high-frequency microstrip dielectric board. The main circuit 41 is etched on the front side, and the cross-coupling circuit 42 is etched on the back side. One end of the main circuit 41 is connected to a radiating arm in the metal dipole arm 6, and the other end of the main circuit 41 is connected to the inner conductor of the antenna feed port 1.

[0037] In the frequency range of 1.6 GHz to 9.7 GHz, when the dielectric constant of the selected high-frequency microstrip dielectric plate is 2.94, the vertical height between the metal vibrator arm 6 and the upper surface of the reflector 2 is 30.3 mm. Figure 6 As shown, the antenna standing wave ratio is less than 2, such as Figure 8 As shown, the unit gain is about 4.9dB at the operating frequency f1. Fig. 9 As shown, the 3dB lobe width E-plane lobe width ≥ 140°, and the H-plane lobe width ≥ 80°, which meets the corresponding scanning requirements of the azimuth and elevation lobe of the phased array radar.

[0038] The main circuit 41 adopts the form of a series capacitor and a parallel inductor on the front side of the high-frequency microstrip dielectric plate. The cross-coupling circuit 42 adopts two SIR step capacitors and inductors in parallel to couple with the main circuit 41 to achieve cross-coupling and form a transmission zero point to achieve suppression of the required frequency band. The number of zero points can be selected according to the degree of suppression. This embodiment mainly suppresses the auxiliary radar frequency band. Figure 7 It can be seen that the suppression within the auxiliary radar frequency band can reach more than 50dB, and the first suppression zero point value is as high as 75dB.

[0039] The antenna feed port 1 is a probe or connector, and the characteristic impedance of the feed port is 50 ohms. The inner conductor of the connector extends into the suspended air cavity 3 and is connected to the main circuit 41, directly feeding the cross-coupled microstrip filter oscillator antenna. The outer conductor of the connector is connected to the bottom of the reflector 2 to achieve good grounding. The connector can use a BMA blind-mate connector. The blind-mate connector model is matched with the DAM digital transceiver component connector. The connector structure is blind-plugged with the DAM digital transceiver component to achieve fast plug-in and RF connection between devices, which is convenient for system installation and maintenance. The single-channel antenna is quickly plugged in and out and integrated to meet the high mobility requirements of large phased array radars. Taking advantage of the fact that the operating frequency band of the main radar antenna is higher than the operating frequency band of the auxiliary radar, and the more appropriate unit spacing, the channel spacing of the DAM transceiver component or the SUM component is set, so that the DAM transceiver component or the SUM component can be quickly connected and plugged in with the cross-coupled microstrip filter oscillator antenna. According to the basic module layout of the array, the cross-coupled microstrip filter oscillator antenna can be directly blindly connected to the DAM component or SUM component in a transplanting manner, which greatly simplifies the composition of the array microwave devices, reduces the number of cables and connectors, the structural support of the filter, and the heat dissipation equipment, improves the system reliability, realizes modularization and expandability, and facilitates the automatic contraction and expansion of the antenna array, which can meet the high mobility requirements of shipborne and airborne radars.

[0040] Another radiating arm in the metal dipole arm 6 is connected to the reflector 2 through a U-shaped choke slot to achieve grounding. The circuit antenna radiating arm is parasitic on the cross-coupled cavity filter housing through the U-shaped choke slot, which can achieve in-band signal radiation and high suppression of stopband signals.

[0041] The metal vibrator arm 6 is in a straight line shape or an umbrella shape. When in a straight line shape, the metal vibrator arm 6 is vertically fixed on the filter cover 5. When in an umbrella shape, the metal vibrator arm 6 is fixed on the filter cover 5 at an angle relative to the mounting surface of the filter cover 5.

[0042] The present invention embeds an antenna unit on the cover of a cross-coupled broadband high-pass filter, that is, a balanced-unbalanced feeding structure and a metal dipole arm are derived and designed on the outer shell of the metal cavity of the high-pass filter. The balanced-unbalanced feeding structure is also called a feeding balun, which is used for wide-sweep impedance matching, and the metal dipole arm is used for electromagnetic wave radiation. Without changing the original filtering performance of the high-pass filter and basically maintaining the profile height, the function of radiating electromagnetic waves to the outside is added. The key breakthrough is the performance matching design between the filter and the antenna unit and the coordinated design of the external dimensions. Compared with the traditional RF cable assembly connection between the antenna unit and the filter, when the auxiliary radar frequency is suppressed by 50dB, the system loss can be reduced by 0.5dB, and the shared profile height of the physical size is reduced by about one-fourth of the wavelength of the lowest frequency. The working bandwidth of the filter antenna can be designed according to the different needs of the radar. Without adding additional filter structures and matching circuits, the interference problem of the auxiliary radar of the digital phased array radar system to the main radar is solved, the radar system architecture is simplified, and the system integration is improved.

[0043] The radiation effect of the antenna is similar to that of the original oscillator antenna (the original oscillator antenna refers to Figure 1 The structure of the microstrip circuit board 4 without the suspended cross-coupling is equivalent to that of the original oscillator antenna, and the unit gain and lobe width are equivalent to those of the original oscillator antenna. After the array is formed, it can realize two-dimensional wide-angle scanning of digital phased array radar.

[0044] The present invention also provides a cross-coupled microstrip filter dipole antenna array, which is composed of a plurality of cross-coupled microstrip filter dipole antenna arrays arranged to form an M×N or N×M element antenna array, where M≥N, and an isolation rod 7 is arranged between adjacent dipole antennas arranged in the array along the Y-axis direction, and the isolation rod 7 is fixed on the upper surface of the reflector 2.

[0045] The antenna array composed of the antennas of the present invention can simplify the structural complexity of the phased array radar, reduce the profile height of the whole machine, greatly simplify the microwave system architecture, reduce the variety and quantity of radio frequency microwave components, seamlessly connect the components, and do not require radio frequency cable connection, which greatly reduces feeder loss, reduces circuit size, reduces the weight of the radio frequency front end, and improves the efficiency of the whole machine and the power of the radar.

[0046] In this embodiment, a 5×5 square grid antenna array is arranged using a cross-coupled microstrip filter dipole antenna to verify the stopband suppression effect of the antenna unit array. The horizontal unit spacing is 50 mm and the vertical unit spacing is 50 mm. The array diagram is shown in FIG. Figure 5As shown. The main lobe gain at the fundamental frequency f1 working frequency is calculated by high-frequency electromagnetic simulation to be 19.35dB, and the suppression of the target frequency is as high as 70dB, which meets the radar's anti-interference requirements very well, and there is no need to add high-power cavity filters, aperture conversion, cables, filter bracket supports, etc. in each feeder system. Thereby greatly reducing the equipment volume of phased array radar and the unreliability caused by too many connections. By optimizing the length sharing of the two microwave device structural parts, the high integration, miniaturization and light weight design of the radar system are realized, which greatly reduces the RF loss of the radar system and improves the working efficiency of the radar. Because the filter oscillator antenna of this invention has both filtering and radiation functions, it can be widely used in advanced phased array radar systems. It has a simple structure, high reliability and a strong degree of system integration. It has low loss and medium power resistance. The optimal design effect is achieved both in terms of electrical performance indicators and structural design. The present invention can also be applied to vehicle-mounted and ship-mounted satellite communication systems, and can provide technical accumulation and valuable design experience for other similar pre-research or products in the future. It has strong versatility and practicality.

[0047] The existing filter is installed in the feed box through a cable, and it is necessary to consider the heat dissipation problem under high power after the combination. However, the present invention places the filter and the antenna directly above the reflector 2, and there is no need to consider the heat dissipation structure, and the space is used for efficient natural heat dissipation. An integrated antenna cover 8 is provided above each vibrator antenna. The integrated antenna cover 8 can be a thin-walled wave-transparent cover, which is installed on the main feed cavity to provide engineering protection for the entire antenna. After the array is formed, an integral cover can also be installed for protection. The antenna cover is integrated in the axial direction of the cross-coupled microstrip filter vibrator antenna and is integrated with the cross-coupled microstrip filter. It does not need to rely on a large antenna cover to effectively protect the filter antenna. The entire antenna feed system does not require additional heat dissipation equipment under high-power conditions. The suspended high-integration filter antenna can be efficiently radiated and dissipated through natural heat dissipation.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cross-coupled microstrip filter dipole antenna, characterized in that: The invention comprises an antenna feed port (1), a reflector (2), a suspended cross-coupled microstrip circuit board (4), a filter cover plate (5), and a metal dipole arm (6); the filter cover plate (5) is located on the upper surface of the reflector (2) and encloses the reflector (2) to form a suspended air cavity (3); the suspended cross-coupled microstrip circuit board (4) is located in the suspended air cavity (3); the inner conductor of the antenna feed port (1) extends into the suspended air cavity (3) and is connected to the suspended cross-coupled microstrip circuit board (4); the outer conductor of the antenna feed port (1) is connected to the reflector (2); the metal dipole arm (6) is located on the filter cover plate (5); one radiating arm of the metal dipole arm (6) is connected to the suspended cross-coupled microstrip circuit board (4); and the other radiating arm of the metal dipole arm (6) is grounded.

2. The cross-coupled microstrip filter dipole antenna according to claim 1, characterized in that: The metal vibrator arm (6) is parasitic on the side wall of the filter cover plate (5), and the distance between the metal vibrator arm (6) and the reflection plate (2) is a quarter wavelength of the low frequency.

3. The cross-coupled microstrip filter dipole antenna according to claim 1, characterized in that: The suspended cross-coupling microstrip circuit board (4) comprises a high-frequency microstrip dielectric board, a main circuit (41) is etched on the front side of the high-frequency microstrip dielectric board, and a cross-coupling circuit (42) is etched on the back side, one end circuit of the main circuit (41) is connected to a radiation arm in a metal dipole arm (6), and the other end circuit of the main circuit (41) is connected to an inner conductor of an antenna feed port (1).

4. The cross-coupled microstrip filter dipole antenna according to claim 3, characterized in that: The dielectric constant of the high-frequency microstrip dielectric plate is 2.94, and the vertical height between the metal vibrator arm (6) and the upper surface of the reflection plate (2) is 30.3 mm.

5. The cross-coupled microstrip filter dipole antenna according to claim 3, characterized in that: The main circuit (41) adopts the form of a series capacitor and a parallel inductor on the front side of the high-frequency microstrip dielectric plate, and the cross-coupling circuit (42) adopts two SIR step capacitors and inductors connected in parallel to couple with the main circuit (41) to achieve cross-coupling and form a transmission zero point.

6. The cross-coupled microstrip filter dipole antenna according to claim 3, characterized in that: The antenna feed port (1) is a probe or a connector, and the characteristic impedance of the feed port is 50 ohms. When the antenna feed port (1) is a connector, the inner conductor of the connector extends into the suspended air cavity (3) and is connected to the main circuit (41) to feed the oscillator antenna, and the outer conductor of the connector is connected to the reflector (2) to achieve grounding.

7. The cross-coupled microstrip filter dipole antenna according to claim 1, characterized in that: Another radiation arm in the metal dipole arm (6) is connected to the reflection plate (2) via a U-shaped choke slot to achieve grounding.

8. The cross-coupled microstrip filter dipole antenna according to claim 1, characterized in that: The metal vibrator arm (6) is in a straight line shape or an umbrella shape. When in a straight line shape, the metal vibrator arm (6) is vertically fixed on the filter cover plate (5). When in an umbrella shape, the metal vibrator arm (6) is fixed on the filter cover plate (5) at an angle inclined relative to the mounting surface of the filter cover plate (5).

9. A cross-coupled microstrip filter dipole antenna array, characterized in that: An M×N or N×M element antenna array is formed by a plurality of cross-coupled microstrip filter antennas as described in any one of claims 1 to 8, where M≥N, and an isolation rod (7) is provided between adjacent antennas arranged in the array along the Y direction, and the isolation rod (7) is fixed on the upper surface of the reflector (2).

10. The cross-coupled microstrip filter dipole antenna array according to claim 9, characterized in that: An integrated antenna cover (8) is arranged above each dipole antenna.

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