CN215008522U

CN215008522U - Radio frequency receiving end cavity filter based on S-band harmonic radar

Info

Publication number: CN215008522U
Application number: CN202121460631.3U
Authority: CN
Inventors: 王国富; 史志雄; 梁转转; 简立玮; 覃觅觅; 叶金才; 王鑫; 王小红
Original assignee: Guangxi University of Science and Technology
Current assignee: Guangxi University of Science and Technology
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-12-03
Anticipated expiration: 2031-06-29

Abstract

The utility model belongs to the technical field of radar communication, specifically disclose a based on S wave band harmonic radar radio frequency receiving terminal cavity filter, including the cavity, be equipped with a baffle in the cavity, the baffle will the cavity separates for first cavity and second cavity, be equipped with many resonance bars that interval and arrange side by side in first cavity and the second cavity respectively, one end of resonance bar with the inner wall of first cavity or second cavity is connected, the one end that is located on first cavity and the second cavity and keeps away from the resonance bar stiff end still is equipped with the tuning screw rod, the tuning screw rod sets up with the resonance bar is coaxial; and a diaphragm structure is arranged between two adjacent resonance rods in the first cavity and the second cavity. The utility model discloses it is small, outband inhibition power is strong, has reached required low false alarm rate when detecting less target.

Description

Radio frequency receiving end cavity filter based on S-band harmonic radar

Technical Field

The utility model relates to a radar communication technical field, concretely relates to based on S wave band harmonic radar radio frequency receiving terminal cavity filter.

Background

Filters are widely used in the field of communications, particularly radio frequency communications, as a frequency selective device. In a base station in which a communication system performs signal transmission and reception, filters are used to select communication signals and filter out spurious or interfering signals outside the frequency of the communication signals.

The existing filter has the problems of large volume, weak out-of-band rejection capability and the like in the application of a harmonic detector, and in the existing filter, the coupling between adjacent resonance rods is strong, so that the distance between the resonance rods is large.

Disclosure of Invention

The utility model aims at the above problem, a based on S wave band harmonic radar radio frequency receiving terminal cavity filter is provided, should be based on S wave band harmonic radar radio frequency receiving terminal cavity filter is small, and the outband inhibition ability is strong, has reached required low false alarm rate when detecting less target.

In order to achieve the above object, the utility model adopts the following technical scheme:

a cavity filter of a radio frequency receiving end based on an S-band harmonic radar comprises a cavity, wherein a partition plate is arranged in the cavity, the cavity is divided into a first cavity and a second cavity by the partition plate, a plurality of resonance rods which are arranged at intervals in parallel are respectively arranged in the first cavity and the second cavity, a cover plate is arranged on the cavity, and one end of each resonance rod is fixedly connected with the bottom of the cavity or the cover plate; a plurality of tuning screws are further arranged on the cover plate or at one end of the bottom of the cavity far away from the fixed end of the resonant rod, and each tuning screw is coaxially arranged with each resonant rod; and a diaphragm structure is arranged between two adjacent resonance rods in the first cavity and the second cavity.

Furthermore, the diaphragm structure includes first diaphragm and second diaphragm, one side of first diaphragm and the inner wall fixed connection of first cavity or second cavity, one side and the baffle fixed connection of second diaphragm, just the clearance between first diaphragm and the second diaphragm forms the coupling window, the width of coupling window is 5 mm.

Furthermore, the heights of the first diaphragm and the second diaphragm in the first cavity are the same as the height of the first cavity, the heights of the first diaphragm and the second diaphragm in the second cavity are the same as the height of the second cavity, and the widths of the first diaphragm and the second diaphragm are both 1 mm.

Further, the first cavity, the resonant rod in the first cavity, the diaphragm structure and the tuning screw rod on the first cavity form a first cavity filter, and the center frequency of the first cavity filter is 4.9 GHz;

the second cavity, the resonant rod in the second cavity, the diaphragm structure and the tuning screw rod on the second cavity form a second cavity filter, and the center frequency of the second cavity filter is 7.35 GHz.

Further, the height of the resonance rod in the first cavity filter is 13.5mm, the height of the resonance rod in the second cavity filter is 8.5mm, and the height of the tuning screw rod in the cavity is 0.5-2 mm.

Further, the height of the first cavity is 16mm, and the height of the second cavity is 11 mm; the bottom of the first cavity is used as a supporting leg, and the bottom of the second cavity is higher than the bottom of the first cavity, so that the upper surfaces of the first cavity and the second cavity are flush.

Further, the partition plate is made of a copper material.

Further, the first cavity filter and the second cavity filter are interdigital cavity band-pass filters.

By adopting the technical scheme, the beneficial effects of the utility model are that:

the utility model can effectively reduce the coupling strength between the resonance rods by adding the diaphragm structure, further reduce the coupling distance between the resonance rods, finally realize effectively reducing the filter volume, improve the passband performance and the out-of-band rejection capability of the filter, meanwhile, two cavity filters with different center frequencies added into the diaphragm structure are optimized and combined, so that the width size of the cavity is further reduced, and can receive second and third harmonic signals reflected by a detection target after optimized combination, has stronger inhibition capability on fundamental waves and second and third harmonics, therefore, the utility model greatly reduces the volume of the cavity filter, realizes the miniaturization and high performance of the cavity filter of the radio frequency receiving end of the harmonic radar, meanwhile, fundamental wave, second harmonic and third harmonic can be inhibited, out-of-band inhibition capability is greatly enhanced, and low false alarm rate required by detection of smaller targets is achieved. Furthermore, the utility model discloses only need a combination cavity, the processing preparation of being convenient for.

Drawings

Fig. 1 is a front view of the cavity filter of the rf receiving end based on the S-band harmonic radar of the present invention;

fig. 2 is a top view of the cavity filter of the rf receiving end based on the S-band harmonic radar of the present invention;

fig. 3 is a schematic structural diagram of a cavity in the S-band harmonic radar-based radio frequency receiving end cavity filter of the present invention;

fig. 4 is a top view of the cavity in the cavity filter of the receiving end based on the S-band harmonic radar radio frequency of the present invention;

in the figure, 1-chamber; 11-first cavity, 12-second cavity, 13-first threaded hole, 14-second threaded hole, 2-partition plate, 3-resonant rod, 4-tuning screw, 5-diaphragm structure, 51-first diaphragm, 52-second diaphragm, 53-coupling window, 6-excitation port connector and 7-cover plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Examples

Referring to fig. 1 to 4, the S-band harmonic radar-based radio frequency receiving end cavity filter includes a cavity 1, a partition plate 2 is disposed in the cavity 1, and the partition plate 2 is made of a conventional copper material (H62). The cavity 1 is divided into a first cavity 11 and a second cavity 12 by the partition plate 2, a plurality of resonance rods 3 which are arranged at intervals in parallel are respectively arranged in the first cavity 11 and the second cavity 12, a cover plate 7 is arranged on the cavity 1, and one end of each resonance rod 3 is fixedly connected with the bottom of the cavity 1 or the cover plate 7 through a screw; a plurality of tuning screws 4 are further arranged on the cover plate 7 or at one end of the bottom of the cavity 1, which is far away from the fixed end of the resonant rod 3, and each tuning screw 4 and each resonant rod 3 are coaxially arranged; and a diaphragm structure 5 is fixedly arranged between two adjacent resonance rods 3 in the first cavity 11 and the second cavity 12.

In this embodiment, the diaphragm structure 5 includes a first diaphragm 51 and a second diaphragm 52, one side of the first diaphragm 51 is fixedly connected to the inner wall of the first cavity 11 or the second cavity 12, one side of the second diaphragm 52 is fixedly connected to the partition board 2, a gap between the first diaphragm 51 and the second diaphragm 52 forms a coupling window 53, and the width of the coupling window 53 is 5 mm. The heights of the first diaphragm 51 and the second diaphragm 52 in the first cavity 11 are the same as the height of the first cavity 11, the heights of the first diaphragm 51 and the second diaphragm 52 in the second cavity 12 are the same as the height of the second cavity 12, and the widths of the first diaphragm 51 and the second diaphragm 52 are both 1 mm. Through the arrangement of the diaphragm structure 5, the coupling strength between the resonance rods can be effectively reduced, the coupling distance between the resonance rods 3 is further reduced, the size of the filter is effectively reduced, and the passband performance and the out-of-band rejection capability of the filter are improved.

Further, the first cavity 11, the resonant rod 3 in the first cavity 11, the diaphragm structure 5, and the tuning screw 4 on the first cavity 11 form a first cavity filter, and the center frequency of the first cavity filter is 4.9 GHz. The second cavity 12, the resonant rod 3 in the second cavity 12, the diaphragm structure 5 and the tuning screw 4 on the second cavity 12 form a second cavity filter, and the center frequency of the second cavity filter is 7.35GHz, so that the filter formed by combining the first cavity filter and the second cavity filter can meet the requirement of the front receiving end of a harmonic radar, is used for receiving signals with the center frequency of 4.9GHz and the center frequency of 7.35GHz, and does not affect each other.

The first cavity filter and the second cavity filter are interdigital cavity band-pass filters, namely, two adjacent resonant rods 3 of the first cavity filter and two adjacent tuning screws 4 are arranged, the bottom of one resonant rod 3 is fixed on the bottom of the cavity 1, and the top of the other resonant rod 3 is fixed on the cover plate 7. One tuning screw 4 is inserted on the cover plate 7 in a threaded manner, and the other tuning screw 4 is inserted on the bottom of the cavity 1 in a threaded manner. The second cavity filter works the same. Therefore, at the bottom of the first cavity 11 and the second cavity 12, a first threaded hole 13 for fixing the resonance rod 3 and a second threaded hole 14 for threadedly inserting the tuning screw 4 are respectively provided at intervals across. Similarly, the cover plate 7 is also provided with a corresponding threaded hole (not shown) for fixing the resonance rod 3 and inserting the tuning screw 4.

In this embodiment, the height of the first cavity 11 is 16mm, and the height of the second cavity 12 is 11 mm; the bottom of the first cavity 11 is used as a support leg, and the bottom of the second cavity 12 is higher than the bottom of the first cavity 11, so that the upper surfaces of the first cavity 11 and the second cavity 12 are flush, and the tuning screw 4 can be adjusted conveniently.

Correspondingly, the height of the resonance rod 3 in the first cavity filter is 13.5mm, the height of the resonance rod 3 in the second cavity filter is 8.5mm, and the height of the resonance rod 3 is optimally set, so that the tuning screw rod 4 can be conveniently adjusted. Wherein the height of the tuning screw 4 in the cavity 1 is 0.5-2mm, and the tuning screw 4 can be adjusted in the range, and when two frequencies of 4.9GHz and 7.35GHz are obtained, the height of the tuning screw 4 in the cavity 1 is 1 mm.

In addition, as in the prior art, in this embodiment, both ends of the first cavity filter and the second cavity filter are further connected to excitation port connectors 6 for inputting and outputting signals, and the height of the excitation port connector 6 of the first cavity filter is 2.5 mm. The height of the excitation port connection 6 of the second cavity filter is 2 mm.

The utility model can effectively reduce the coupling strength between the resonance rods 3 by adding the membrane structure 5, thereby reducing the coupling distance between the resonance rods 3, finally realizing the effective reduction of the filter volume, improving the passband performance and the out-of-band rejection capability of the filter, meanwhile, two cavity filters with different center frequencies added into the diaphragm structure 5 are optimized and combined, so that the width size of the cavity is further reduced, and can receive second and third harmonic signals reflected by a detection target after optimized combination, has stronger inhibition capability on fundamental waves and second and third harmonics, therefore, the utility model greatly reduces the volume of the cavity filter, realizes the miniaturization and high performance of the cavity filter of the radio frequency receiving end of the harmonic radar, meanwhile, fundamental wave, second harmonic and third harmonic can be inhibited, out-of-band inhibition capability is greatly enhanced, and low false alarm rate required by detection of smaller targets is achieved. Furthermore, the utility model discloses only need a combination cavity, the later stage processing of being convenient for.

The above description is for the detailed description of the preferred possible embodiments of the present invention, but the embodiments are not intended to limit the scope of the present invention, and all equivalent changes or modifications accomplished under the technical spirit suggested by the present invention should fall within the scope of the present invention.

Claims

1. A cavity filter of a radio frequency receiving end based on an S-band harmonic radar comprises a cavity and is characterized in that a partition plate is arranged in the cavity, the cavity is divided into a first cavity and a second cavity by the partition plate, a plurality of resonance rods which are arranged at intervals in parallel are arranged in the first cavity and the second cavity respectively, a cover plate is arranged on the cavity, and one end of each resonance rod is fixedly connected with the bottom of the cavity or the cover plate; a plurality of tuning screws are further arranged on the cover plate or at one end of the bottom of the cavity far away from the fixed end of the resonant rod, and each tuning screw is coaxially arranged with each resonant rod; and a diaphragm structure is arranged between two adjacent resonance rods in the first cavity and the second cavity.

2. The S-band harmonic radar-based radio frequency receiving end cavity filter according to claim 1, wherein the diaphragm structure comprises a first diaphragm and a second diaphragm, one side of the first diaphragm is fixedly connected with the inner wall of the first cavity or the second cavity, one side of the second diaphragm is fixedly connected with the partition plate, a gap between the first diaphragm and the second diaphragm forms a coupling window, and the width of the coupling window is 5 mm.

3. The S-band harmonic radar-based radio frequency receiving end cavity filter according to claim 2, wherein the heights of the first diaphragm and the second diaphragm in the first cavity are the same as the height of the first cavity, the heights of the first diaphragm and the second diaphragm in the second cavity are the same as the height of the second cavity, and the widths of the first diaphragm and the second diaphragm are both 1 mm.

4. The S-band harmonic radar-based radio frequency receiving end cavity filter according to claim 1, wherein the first cavity, the resonant rod and the diaphragm structure in the first cavity, and the tuning screw on the first cavity form a first cavity filter, and the center frequency of the first cavity filter is 4.9 GHz;

the second cavity, the resonant rod and the diaphragm structure in the second cavity and the tuning screw rod on the second cavity form a second cavity filter, and the center frequency of the second cavity filter is 7.35 GHz.

5. The S-band harmonic radar-based radio frequency receiving end cavity filter according to claim 4, wherein the height of the resonant rod in the first cavity filter is 13.5mm, the height of the resonant rod in the second cavity filter is 8.5mm, and the height of the tuning screw in the cavity is 0.5-2 mm.

6. The S-band harmonic radar-based radio frequency receiving end cavity filter according to claim 1, wherein the height of the first cavity is 16mm, and the height of the second cavity is 11 mm; the bottom of the first cavity is used as a supporting leg, and the bottom of the second cavity is higher than the bottom of the first cavity, so that the upper surfaces of the first cavity and the second cavity are flush.

7. The S-band harmonic radar-based radio frequency receiving end cavity filter according to claim 4, wherein the partition is a copper material.

8. The S-band harmonic radar-based radio frequency receiving end cavity filter according to claim 4, wherein the first cavity filter and the second cavity filter are interdigital cavity band-pass filters.