阅读说明：本技术 高抑制腔体滤波器及其组装调试方法 (High-rejection cavity filter and assembling and debugging method thereof ) 是由 骆云 于宏健 曹亮 马宁 杨健 胡明武 龚旭梅 于 2021-10-08 设计创作，主要内容包括：本发明公开了高抑制腔体滤波器及其组装调试方法,涉及滤波器领域,腔体滤波器包括底座、谐振杆、第一圆环盘、盖板和螺钉,底座上设置有谐振腔,谐振杆上设置有放置槽,盖板上设置有多个螺纹安装孔；组装调试方法包括S1组装腔体滤波器,S2对组装好的腔体滤波器进行调试,S3判断当下组装好的金属导体与谐振杆之间的距离是否合适,不合适进入S4；反之则结束调试；S4用烙铁烫化锡膏左右拨动改变第二圆环盘的位置,然后再用锡膏焊接固定,并返回S2；通过在谐振杆的上端设置有放置槽,腔体滤波器螺钉的下端穿过盖板的安装孔位于放置槽内,降低整体腔体滤波器的高度,满足低频率下滤波器体积小型化的要求。(The invention discloses a high-suppression cavity filter and an assembling and debugging method thereof, and relates to the field of filters, wherein the cavity filter comprises a base, a resonance rod, a first annular disc, a cover plate and screws, wherein the base is provided with a resonance cavity, the resonance rod is provided with a placing groove, and the cover plate is provided with a plurality of threaded mounting holes; the assembling and debugging method comprises the steps of S1 assembling the cavity filter, S2 debugging the assembled cavity filter, and S3 judging whether the distance between the currently assembled metal conductor and the resonance rod is proper or not, and if not, entering S4; otherwise, finishing debugging; s4, poking the solder paste with a soldering iron left and right to change the position of the second annular disc, then soldering and fixing with the solder paste, and returning to S2; the placing groove is formed in the upper end of the resonant rod, the lower end of the cavity filter screw penetrates through the mounting hole of the cover plate and is located in the placing groove, the height of the whole cavity filter is reduced, and the requirement of size miniaturization of the filter under low frequency is met.)

1. High suppression cavity filter, its characterized in that includes:

a base; a resonant cavity is arranged on the base;

a plurality of resonant rods; the lower ends of the resonance rods are fixedly arranged in the resonance cavities, and the upper end of each resonance rod is provided with a placing groove;

a plurality of first toroidal discs; a first circular ring disc is fixedly connected with the upper end of a resonance rod;

a cover plate; the cover plate is fixedly connected with the base, and a plurality of threaded mounting holes are formed in the cover plate;

and the lower end of one screw penetrates through one mounting hole and is positioned in one placing groove, and the screws are not in contact with the resonance rod.

2. The filter of claim 1, further comprising a metal conductor, wherein the first annular disc located at the two transmission zeros is provided with an open slot, the two open slots are opposite to each other, the metal conductor is fixed on the base, two ends of the metal conductor are respectively located in the two open slots, and the metal conductor is not in contact with the resonant rod.

3. The high-rejection cavity filter according to claim 2, wherein the filter further comprises two second annular discs, the two second annular discs are fixed to two ends of the metal conductor by solder paste welding, the diameter of each second annular disc is larger than the size of each end of the metal conductor, the two second annular discs are respectively located in the two open slots, and the second annular discs are not in contact with the resonant rod.

4. The high rejection cavity filter according to claim 2, wherein said resonator has a zigzag structure with 6 resonator rods.

5. The high rejection cavity filter of claim 1, wherein each first annular disk has a ring groove on a side thereof away from the cover plate.

6. The assembling and debugging method of the high-suppression cavity filter is characterized by comprising the following steps:

s1, respectively penetrating the two second circular ring discs through two ends of the metal conductor and fixing the two second circular ring discs on the metal conductor by solder paste welding, then installing the resonance rod and the metal conductor in a resonance cavity of the base, covering the base by a cover plate, penetrating the lower ends of the screws into the placing grooves of the resonance rod through the installing holes in the cover plate, and assembling the high-suppression cavity filter as claimed in any one of claims 1 to 5;

s2, debugging the assembled cavity filter;

s3, judging whether the distance between the assembled metal conductor and the resonance rod is proper or not, if not, entering S4; if the current cavity filter is suitable, the debugging is finished, and the currently assembled cavity filter is a finished cavity filter;

and S4, poking the solder paste left and right by using a soldering iron to change the position of the second circular disc, then soldering and fixing the second circular disc by using the solder paste, and returning to S2.

Technical Field

The invention relates to the field of filters, in particular to a high-rejection cavity filter and an assembling and debugging method thereof.

Background

The microwave filter functions as a frequency selection device to pass a desired frequency signal and greatly suppress an undesired frequency signal. The microwave filters are classified by function into a low-pass filter, a high-pass filter, a band-pass filter and a band-stop filter; the structural types of the filter are classified into a microstrip filter, a waveguide filter, a dielectric filter, a cavity filter, and the like. The microstrip filter and the cavity filter are widely used. The microstrip filter has the advantages of small volume, light weight, low profile, conformal carrier, low manufacturing cost, easy mass production and the like. The cavity filter is made of metal, has a firm structure, is far away from a high-end parasitic passband and can inhibit at least one harmonic wave; because the metal processing is adopted, the uniformity of the cavity filter is better, and compared with the waveguide filter, the volume of the cavity filter is smaller because the capacitor loading can be carried out; the input and the output can be matched with 50 omega impedance, the standing wave is small, and the cascade connection use is easy; the cavity filter has the advantages of flat in-band amplitude-frequency characteristic, small insertion loss, high out-of-band rejection and flexible design, and can be designed according to user requirements and installation modes. Compared with a microstrip filter, the cavity filter has a high Q value; the out-of-band rejection of the cavity filter under the same order is superior to that of the microstrip filter; the dielectric constant of the dielectric plate of the microstrip filter is not uniformly distributed, so that the microstrip filter can only be used in a lower frequency band, and the cavity filter can cover the Ka frequency band at most (the cavity filter is usually used below the K frequency band, the Ka frequency band is usually used as a waveguide filter, and the size of the cavity filter in the Ka frequency band is greatly different from that of the waveguide filter).

With the development of modern wireless communication technology and the combination of advanced microwave integrated circuit technology and system-on-chip integrated technology, wireless communication at any time and place becomes a reality. As a component of a communication system, miniaturization and high performance of a microwave filter are also important considerations in design. In particular, in communication systems for various aircraft, it is desirable that each device constituting the communication system is as small as possible under the condition that performance requirements are satisfied.

Disclosure of Invention

The invention aims to solve the problems and designs a high-rejection cavity filter and an assembling and debugging method thereof.

The invention realizes the purpose through the following technical scheme:

a high rejection cavity filter comprising:

a base; a resonant cavity is arranged on the base;

a plurality of resonant rods; the lower ends of the resonance rods are fixedly arranged in the resonance cavities, and the upper end of each resonance rod is provided with a placing groove;

a plurality of first toroidal discs; a first circular ring disc is fixedly connected with the upper end of a resonance rod;

a cover plate; the cover plate is fixedly connected with the base, and a plurality of threaded mounting holes are formed in the cover plate;

and the lower end of one screw penetrates through one mounting hole and is positioned in one placing groove, and the screws are not in contact with the resonance rod.

The assembling and debugging method of the high-rejection cavity filter comprises the following steps:

s1, respectively penetrating the two second circular ring discs through two ends of the metal conductor and welding and fixing the two second circular ring discs on the metal conductor through solder paste, then installing the resonance rod and the metal conductor in a resonance cavity of the base, covering the base by the cover plate, penetrating the lower ends of the screws through the installation holes in the cover plate to reach the placing groove of the resonance rod, and assembling the high-suppression cavity filter;

s2, debugging the assembled cavity filter;

s3, judging whether the distance between the assembled metal conductor and the resonance rod is proper or not, if not, entering S4; if the current cavity filter is suitable, the debugging is finished, and the currently assembled cavity filter is a finished cavity filter;

and S4, poking the solder paste left and right by using a soldering iron to change the position of the second circular disc, then soldering and fixing the second circular disc by using the solder paste, and returning to S2.

The invention has the beneficial effects that: the placing groove is formed in the upper end of the resonant rod, the lower end of the cavity filter screw penetrates through the mounting hole of the cover plate and is located in the placing groove, the height of the whole cavity filter is reduced, and the requirement of size miniaturization of the filter under low frequency is met.

Drawings

FIG. 1 is a schematic diagram of an external appearance of a high rejection cavity filter according to the present invention;

FIG. 2 is a schematic diagram of the internal structure of the high rejection cavity filter of the present invention;

FIG. 3 is a schematic diagram of the structure of the resonant cavity in the high rejection cavity filter of the present invention;

fig. 4 is a schematic view of a mounting structure of a metal conductor in the high rejection cavity filter according to the present invention;

FIG. 5 is a schematic structural diagram of a resonant rod in the high rejection cavity filter according to the present invention;

FIG. 6 is a schematic cross-sectional view of a resonating bar in a high rejection cavity filter according to the present invention;

fig. 7 is a schematic structural diagram of a metal conductor in the high rejection cavity filter of the present invention;

FIG. 8 is a schematic structural diagram of a cover plate in the high rejection cavity filter according to the present invention;

wherein corresponding reference numerals are:

the method comprises the following steps of 1-base, 2-resonant cavity, 3-resonant rod, 4-placing groove, 5-ring groove, 6-first circular ring disc, 7-cover plate, 8-threaded mounting hole, 9-screw, 10-metal conductor, 11-open groove and 12-second circular ring disc.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The following detailed description of embodiments of the invention refers to the accompanying drawings.

As shown in fig. 1, 2, 3, 4, 5, 6, 7, and 8, the high rejection cavity filter includes:

a base 1; a resonant cavity 2 is arranged on the base 1;

a plurality of resonance rods 3; the lower ends of the resonant rods 3 are fixedly arranged in the resonant cavities 2, and the upper end of each resonant rod 3 is provided with a placing groove 4;

a plurality of first toroidal discs 6; a first circular ring disk 6 is fixedly connected with the upper end of a resonance rod 3;

a cover plate 7; the cover plate 7 is fixedly connected with the base 1, a plurality of thread mounting holes 8 are formed in the cover plate 7, and the resonance rod 3 is not in contact with the cover plate 7 to form a capacitance effect;

a plurality of screws 9, the lower extreme of a screw 9 passes a mounting hole and is located a standing groove 4, and screw 9 and resonance bar 3 do not have contact between them, reduce the height of whole cavity filter.

As shown in fig. 2, 3, 4, 5, 6, and 7, the filter further includes a metal conductor 10, the first annular disc 6 located at two transmission zeros is provided with two open slots 11, the two open slots 11 are disposed oppositely, the metal conductor 10 is fixed on the base 1, two ends of the metal conductor 10 are respectively located in the two open slots 11, the metal conductor 10 and the resonant rod 3 are not in contact, the structure that the resonant rod 3 is provided with the open slots 11 is adopted, the metal conductor 10 increasing the transmission zeros is extended into the open slots 11, which is equivalent to reducing the distance between the resonant rod 3 and the metal conductor 10, the structure can lead the transmission zero point to be close to the pass band of the cavity filter, improves the out-of-band rejection performance of the filter, has more firm structure, the size of the open slot 11 is larger than the maximum diameter of the metal conductor 10 and the second circular ring disc 12, the metal conductor 10 or the second circular disc 12 does not contact the resonant bar 3 under vibration conditions.

As shown in fig. 3, 4, 5, 6, 7, the filter further includes two second ring disks 12, the two second ring disks 12 are fixed at two ends of the metal conductor 10 by solder paste welding, the diameter of the second ring disk 12 is larger than the size of the two ends of the metal conductor 10, the two second ring disks 12 are respectively located in the two open slots 11, no contact exists between the second ring disks 12 and the resonance rod 3, the second ring disks 12 are fixed at two ends of the metal conductor 10 by solder paste welding, the positions of the two ring disks can be changed by poking the solder paste left and right by an iron during debugging, the two ring disks can be welded by solder paste after reaching the proper positions, the debugging is convenient, the structure is firm, and the two ring disks can not contact with the resonance rod 3 under the vibration condition.

As shown in fig. 3 and 4, the resonant cavity 2 has a convex structure, and there are 6 resonant rods 3.

As shown in fig. 6, a weight reduction ring groove 5 is formed in the side surface of each first circular ring disc 6 away from the cover plate 7, and a capacitance effect is added between the first circular ring disc 6 and the resonant rod 3, so that the resonant frequency is further reduced, and the size of the cavity filter is reduced.

The assembling and debugging method of the high-rejection cavity filter comprises the following steps:

s1, respectively penetrating two second circular discs 12 through two ends of a metal conductor 10 and welding and fixing the two second circular discs on the metal conductor 10 through solder paste, then installing the resonant rod 3 and the metal conductor 10 in the resonant cavity 2 of the base 1, covering the base 1 with a cover plate 7, penetrating the lower end of a screw 9 through an installation hole in the cover plate 7 to deeply reach the placing groove 4 of the resonant rod 3, and assembling the high-suppression cavity filter;

s2, debugging the assembled cavity filter;

s3, judging whether the distance between the assembled metal conductor 10 and the resonance rod 3 is proper or not, and if not, entering S4; if the current cavity filter is suitable, the debugging is finished, and the currently assembled cavity filter is a finished cavity filter;

and S4, the solder paste is scalded by a soldering iron, the position of the second annular disc 12 is changed by shifting left and right, then the second annular disc is fixed by soldering the solder paste, and the step returns to S2.

The cavity filter has the advantages of simple structure, convenience in debugging and firm structure.

The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.