CN117766965A - Filter - Google Patents

Abstract

The invention discloses a filter, which comprises a cavity, an input feeder line, an output feeder line, a resonant array and two mode conversion devices, wherein an air medium is filled in the cavity, the resonant array comprises a head end resonant unit, a tail end resonant unit and a plurality of resonant units arranged between the head end resonant unit and the tail end resonant unit, one mode conversion device is coupled with the input feeder line and positioned in the head end resonant unit, the other mode conversion device is coupled with the output feeder line and positioned in the tail end resonant unit, TEM mode guided waves are input through the input feeder line and converted into TE mode guided waves through one mode conversion device, TE mode guided waves are sequentially input into the mode conversion devices in the tail end resonant unit through the head end resonant unit and the plurality of resonant units, and then are output through the output feeder line.

Description

Filter

Technical Field

The invention relates to the technical field of communication, in particular to a filter.

Background

The satellite communication system is used as important national basic equipment, has wide and deep application, plays a vital role in national military and national economy, and in recent years, as the types and the number of satellites are continuously increased, the electromagnetic environment is more and more complex, the satellite communication system is increasingly disturbed, and the risk that the normal operation of the system is influenced due to the reduction of the signal to noise ratio of equipment reception and the like is caused in the actual task operation process.

As a filtering device, a filter is widely used in various communication technology fields such as mobile communication, radar, navigation, weather detection, and satellite communication. The functions of channel isolation, harmonic suppression, spurious elimination and the like are performed in a receiving and transmitting unit of wireless communication. The loss of the traditional TEM mode guided wave coaxial filter in the frequency band of 14.51 GHz-14.82 GHz gradually cannot meet the use requirement, and the input/output port of the waveguide filter for transmitting TE mode guided waves or TM mode guided waves is usually a rectangular or circular waveguide port. Additional volume and loss are introduced during the interconversion of the TEM and TE mode guided waves.

It is therefore a matter of interest to those skilled in the art and related to how to avoid introducing additional volume and loss during the TEM mode guided wave and TE mode guided wave interconversions.

Disclosure of Invention

In view of this, the present invention provides a filter for solving the problems of extra volume and loss introduced in the prior art when TEM mode guided wave and TE mode guided wave are mutually converted in the frequency band of 14.51GHz to 14.82 GHz.

In order to achieve one or a part or all of the above or other objects, the present invention provides a filter, including a cavity, an input feeder, an output feeder, a resonant array and two mode conversion devices, wherein an air medium is filled in the cavity, the resonant array includes a head end resonant unit, a tail end resonant unit, and a plurality of resonant units arranged between the head end resonant unit and the tail end resonant unit, one mode conversion device is coupled to the input feeder and located in the head end resonant unit, the other mode conversion device is coupled to the output feeder and located in the tail end resonant unit, a TEM mode guided wave is input through the input feeder, is converted into a TE mode guided wave through one mode conversion device, the TE mode guided wave is sequentially input into the mode conversion device in the tail end resonant unit through the head end resonant unit and the plurality of resonant units, and is converted into a TE mode guided wave and is output through the output feeder.

Based on the technical scheme, the TEM mode guided wave is input through the input feeder line and is converted into the TE mode guided wave through the mode conversion device, the TE mode guided wave is sequentially input into the mode conversion device in the tail end resonance unit through the head end resonance unit and the plurality of resonance units, the TE mode guided wave is converted into the TEM mode guided wave and is output through the output feeder line, and the mode conversion device is simple in structure and is integrated with the head end resonance unit of the filter, so that extra volume and loss are not introduced.

Preferably, the number of the resonance units is seven, seven resonance units are arranged between the head end resonance unit and the tail end resonance unit along the horizontal direction, seven resonance units are respectively a first resonance unit, a second resonance unit, a third resonance unit, a fourth resonance unit, a fifth resonance unit, a sixth resonance unit and a seventh resonance unit, and the internal spaces of the first resonance unit, the second resonance unit, the third resonance unit, the fourth resonance unit, the fifth resonance unit, the sixth resonance unit and the seventh resonance unit are all cuboid chamfer structures.

Based on the technical scheme, the inner spaces of the first resonance unit, the second resonance unit, the third resonance unit, the fourth resonance unit, the fifth resonance unit, the sixth resonance unit and the seventh resonance unit are of cuboid chamfer structures, so that the cavity is conveniently machined, and the quality factor of the resonance unit is higher.

Preferably, the inner spaces of the head end resonance unit and the tail end resonance unit are both in convex chamfer structures.

Based on the technical scheme, the inner spaces of the head-end resonance unit and the tail-end resonance unit are of convex chamfer structures, so that the cavity can be conveniently processed, and meanwhile, the quality factors of the head-end resonance unit and the tail-end resonance unit are higher.

Preferably, the cavity is an aluminum alloy re-silvered material.

Based on the technical scheme, the cavity is made of aluminum alloy copper plating and silver plating materials, so that the quality factor of the resonance unit is increased, the loss in the signal transmission process can be reduced, and meanwhile, the cost is reduced.

Preferably, the input feeder line and the output feeder line are both radio frequency insulators, the impedance is 50 ohms, and the radio frequency insulator dielectric material is quartz glass.

Based on the technical scheme, the input feeder line and the output feeder line are both radio frequency insulators, the radio frequency insulators are made of quartz glass, and the impedance is 50 ohms, so that the filter is convenient to adapt to the application environment of the filter.

Preferably, the bandwidth of the filter is 310MHz.

Based on the above technical scheme, the bandwidth of the filter is 310MHz, and other bandwidths can be selected.

Preferably, the mode switching device is brass re-silvered material and the mode switching device is inverted L-shaped.

Based on the technical scheme, the mode conversion device is in an inverted L shape, so that the mode conversion device is simple in structure and easy to process and assemble, loss can be reduced due to silver plating materials on the surface of brass, and manufacturing cost is low.

Preferably, the filter further includes a plurality of screws, the screws are respectively disposed in the head end resonance unit, the first resonance unit, the second resonance unit, the third resonance unit, the fourth resonance unit, the fifth resonance unit, the sixth resonance unit, the seventh resonance unit and the tail end resonance unit, and the screws are made of M1.2 stainless steel and are further silver-plated.

Based on the technical scheme, the screw is made of M1.2 stainless steel and silver-plated, so that the screw can be used as an equivalent capacitor to facilitate index debugging of the filter.

Preferably, a first through hole is formed in one side wall of the cavity, a second through hole is formed in the other side wall of the cavity, the first through hole and the second through hole are located at two opposite ends, one end of the input feeder line is exposed out of the first through hole, and one end of the output feeder line is exposed out of the second through hole.

Based on the technical scheme, a first through hole is formed in one side wall of the cavity, a second through hole is formed in the other side wall of the cavity, and the first through hole and the second through hole are located at two opposite ends, so that the input feeder line and the output feeder line can be conveniently installed.

Preferably, the filter comprises a cover plate and a fixing piece, a plurality of first mounting holes are formed in the outer wall of the cavity, a plurality of fixing holes are formed in the cover plate, and the fixing piece is connected with the first mounting holes through the fixing holes.

Based on the technical scheme, a plurality of fixed orifices have been seted up on the apron, a plurality of first mounting holes have been seted up on the outer wall of cavity, and the quantity of first mounting hole and fixed orifices is the same, and the one-to-one sets up, and the apron lid is on the cavity, through the mounting in order to realize the firm connection between apron and the cavity, and stable in structure, is convenient for separate apron and cavity to easily debug and uncap the maintenance.

The implementation of the embodiment of the invention has the following beneficial effects:

after the filter is adopted, TEM mode guided waves are input through an input feeder line and are converted into TE mode guided waves through a mode conversion device, the TE mode guided waves are sequentially input into the mode conversion device in the tail end resonance unit through the head end resonance unit and the plurality of resonance units, the TE mode guided waves are converted into TEM mode guided waves and are output through an output feeder line, the mode conversion device is simple in structure and is integrated with the head end resonance unit of the filter, therefore, no extra volume or loss is introduced, compared with the traditional parallel TEM mode guided waves and TE mode guided wave conversion, the stepped diaphragm converter is required, the structure is complex, the insertion loss is large, the filter can reduce the insertion loss, no extra volume or loss is introduced, and the problem of extra volume or loss introduced in the mutual conversion of the TEM mode guided waves and the TE mode guided waves in the frequency range of 14.51 GHz-14.82 GHz in the prior art is solved.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Wherein:

FIG. 1 is a schematic diagram of the overall structure of a filter in one embodiment;

FIG. 2 is a schematic diagram of the structure of the cavity of the filter in one embodiment;

FIG. 3 is a schematic diagram of the structure of a cover plate of a filter in one embodiment;

fig. 4 is a diagram of S-parameter simulation results of a filter in one embodiment.

Reference numerals illustrate: 1. a cavity; 11. a first mounting hole; 12. a first sidewall; 121. a first through hole; 13. a second sidewall; 14. a third sidewall; 141. a second through hole; 15. a fourth sidewall; 16. a bottom wall; 17. a second mounting hole; 2. a cover plate; 21. a fixing hole; 22. a third mounting hole; 3. a resonant array; 31. a head-end resonance unit; 32. a first resonance unit; 33. a second resonance unit; 34. a third resonance unit; 35. a fourth resonance unit; 36. a fifth resonance unit; 37. a sixth resonance unit; 38. a seventh resonance unit; 39. a terminal resonance unit; 4. an input feed line; 5. an output feeder; 6. a mode conversion device; 61. a first mode switching device; 62. a second mode switching device; 7. and (5) a screw.

Detailed Description

In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

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 application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only. In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "disposed," "configured," "connected," "coupled," and the like are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1 and 2, an embodiment of the invention provides a filter, which comprises a cavity 1, a cover plate 2 and a fixing piece, wherein a plurality of first mounting holes 11 are formed in the cavity 1, a plurality of fixing holes 21 are formed in the cover plate 2, the first mounting holes 11 and the fixing holes 21 are the same in number and are correspondingly arranged, one end of the fixing piece penetrates through the fixing holes 21 and is connected with the first mounting holes 11, so that the cavity 1 and the cover plate 2 are fixedly mounted, an air medium is filled in the cavity 1, the fixing piece is in a stable structure such as a screw, a bolt and the like, in the embodiment of the invention, the fixing piece adopts an M1.6 stainless steel countersunk screw so as to realize mechanical fixation between the cavity 1 and the cover plate 2, so that the filter is stable in structure, the filter is easy to debug and cover and maintain, and the cover plate 2 covers the cavity 1, thereby realizing a shielding function and preventing signal leakage.

Referring to fig. 2, the cavity 1 includes a first sidewall 12, a second sidewall 13, a third sidewall 14, a fourth sidewall 15, and a bottom wall 16, lower ends of the first sidewall 12, the second sidewall 13, the third sidewall 14, and the fourth sidewall 15 are all connected to the bottom wall 16 and are disposed perpendicular to the bottom wall 16, the first sidewall 12 and the third sidewall 14 are disposed opposite to each other, one end of the second sidewall 13 is connected to the first sidewall 12, the other end of the second sidewall 13 is connected to the third sidewall 14, the second sidewall 13 is disposed perpendicular to the first sidewall 12 and the third sidewall 14, the fourth sidewall 15 is disposed opposite to the second sidewall 13 and is disposed parallel to the second sidewall 13, one end of the fourth sidewall 15 is connected to the first sidewall 12, the other end of the fourth sidewall 15 is connected to the third sidewall 14, and the cavity 1 is in a rectangular parallelepiped shape.

Referring to fig. 2, the filter further includes a resonance array 3, the resonance array 3 includes a head end resonance unit 31, a terminal resonance unit 39, and a plurality of resonance units disposed between the head end resonance unit 31 and the terminal resonance unit 39, in this embodiment, the number of resonance units between the head end resonance unit 31 and the terminal resonance unit 39 is seven, and the seven resonance units are disposed in a horizontal direction in a row, and the seven resonance units are a first resonance unit 32, a second resonance unit 33, a third resonance unit 34, a fourth resonance unit 35, a fifth resonance unit 36, a sixth resonance unit 37, and a seventh resonance unit 38, respectively, and resonance frequencies of the head end resonance unit 31, the terminal resonance unit 39, the first resonance unit 32, the second resonance unit 33, the third resonance unit 34, the fourth resonance unit 35, the fifth resonance unit 36, the sixth resonance unit 37, and the seventh resonance unit 38 are all near a center frequency of the filter so as to improve the selectivity of the filter.

Referring to fig. 2, the inner spaces of the first, second, third, fourth, fifth, sixth and seventh resonant units 32, 33, 34, 35, 36, 37 and 38 are all rectangular parallelepiped chamfer structures, and the inner spaces of the head and tail resonant units 31 and 39 are each of convex chamfer structures, so that the processing of the cavity 1 is facilitated, and the quality factors of the respective resonant units are higher, and in other embodiments, the inner spaces of the head and tail resonant units 31 and 39 may also be rectangular parallelepiped chamfer structures.

Referring to fig. 2, the cavity 1 is made of aluminum alloy and silver-plated material, so that the quality factor of each resonance unit is increased, loss is reduced, and manufacturing cost is reduced.

Referring to fig. 2, the filter further includes an input feeder 4, an output feeder 5, and two mode conversion devices 6, the two mode conversion devices 6 are a first mode conversion device 61 and a second mode conversion device 62, respectively, the first mode conversion device 61 is disposed in the head end resonance unit 31, the second mode conversion device 62 is disposed in the tail end resonance unit 39, a first through hole 121 is formed in the first side wall 12, a second through hole 141 is formed in the third side wall 14, one end of the input feeder 4 is coupled with the first mode conversion device 61 through the first through hole 121, the other end of the input feeder 4 is exposed to the first through hole 121, one end of the output feeder 5 is coupled with the second mode conversion device 62 through the second through hole 141, the other end of the output feeder 5 is exposed out of the second through hole 141, wherein the input feeder 4 and the output feeder 5 are both radio frequency insulators, the impedance of the radio frequency insulators is 50 ohms, the dielectric materials of the radio frequency insulators are quartz glass, and the first mode conversion device 61 and the second mode conversion device 62 are in inverted L shapes, so that the mode conversion device 6 is simple in structure, easy to process and assemble, and is designed with the head end resonance unit 31 of the filter, no extra loss is introduced, and the first mode conversion device 61 and the second mode conversion device 62 are made of brass re-silvered materials, so that the loss can be effectively reduced, and the manufacturing cost is low.

Referring to fig. 2, the filter further includes a plurality of screws 7, in this embodiment, the number of screws 7 is nine, and the nine screws 7 are made of M1.2 stainless steel and silver plated on the outer surface, each screw 7 is correspondingly disposed in the head end resonance unit 31, the first resonance unit 32, the second resonance unit 33, the third resonance unit 34, the fourth resonance unit 35, the fifth resonance unit 36, the sixth resonance unit 37, the seventh resonance unit 38 and the tail end resonance unit 39, and the screws 7 serve as equivalent capacitors, so as to facilitate index debugging of the filter.

Referring to fig. 2, the first side wall 12 and the third side wall 14 are provided with second mounting holes 17, and the filter can be connected with the second mounting holes 17 by using M2 screws to realize mechanical fixation.

Referring to fig. 3, a third mounting hole 22 is further formed in the cover plate 2 to facilitate the mounting of the screw 7.

Referring to fig. 4, in the filter according to the embodiment of the present invention, the S parameter transmission curve is shown in the abscissa as frequency, in GHz, and the ordinate as S parameter, in dB, when the curve is at the highest point, i.e. the frequency is between 14.5GHz and 14.8GHz, the filter can reach a level of 0 dB, that is, when the signal with the frequency between 14.5GHz and 14.8GHz passes through the filter, the signal with other frequency band can be well conducted, and the signal with other frequency band cannot be transmitted without loss through the filter, so that the filter can filter the signal with the frequency between 14.5GHz and 14.8GHz, and suppress the interference of the noise with other frequency band.

The filter works in the following manner: the guided wave of the TEM mode is input from the input feeder 4 and is converted into a guided wave of the TE mode by the first mode conversion device 61, the guided wave of the TE mode sequentially passes through the first end resonance unit 31, the first resonance unit 32, the second resonance unit 33, the third resonance unit 34, the fourth resonance unit 35, the fifth resonance unit 36, the sixth resonance unit 37, the seventh resonance unit 38 and the end resonance unit 39, and then is converted into the guided wave of the TEM mode by the second mode conversion device 62 and finally is output by the output feeder 5, so that extra volume and loss are avoided when the guided wave of the TEM mode and the guided wave of the TE mode are mutually converted, the wideband of the filter in the embodiment of the application is 310MHz, and in other embodiments, other wideband can be selected for the filter.

The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.

Claims (10)

1. A filter, characterized by: the novel high-efficiency high-frequency high-power microwave resonator comprises a cavity (1), an input feeder line (4), an output feeder line (5), a resonant array (3) and two mode conversion devices (6), wherein the cavity (1) is filled with an air medium, the resonant array (3) comprises a head end resonant unit (31), a tail end resonant unit (39) and a plurality of resonant units arranged between the head end resonant unit (31) and the tail end resonant unit (39), one mode conversion device (6) is coupled with the input feeder line (4) and is positioned in the head end resonant unit (31), the other mode conversion device (6) is coupled with the output feeder line (5) and is positioned in the tail end resonant unit (39), TEM mode guided waves are input through the input feeder line (4), are converted into TE mode guided waves through one mode conversion device (6), TE mode guided waves sequentially pass through the head end resonant unit (31) and the plurality of resonant units are input into the mode conversion devices (6) in the tail end resonant unit (39), and then are converted into TE mode guided waves through the output mode TEM (5).

2. A filter as claimed in claim 1, wherein: the number of the resonance units is seven, seven the resonance units are arranged between the head end resonance unit (31) and the tail end resonance unit (39) along the horizontal direction, the seven resonance units are respectively a first resonance unit (32), a second resonance unit (33), a third resonance unit (34), a fourth resonance unit (35), a fifth resonance unit (36), a sixth resonance unit (37) and a seventh resonance unit (38), and the inner spaces of the first resonance unit (32), the second resonance unit (33), the third resonance unit (34), the fourth resonance unit (35), the fifth resonance unit (36), the sixth resonance unit (37) and the seventh resonance unit (38) are all cuboid chamfer structures.

3. A filter as claimed in claim 2, characterized in that: the inner spaces of the head end resonance unit (31) and the tail end resonance unit (39) are of convex chamfer structures.

4. A filter as claimed in claim 1, wherein: the cavity (1) is made of aluminum alloy and silver plating material.

5. A filter as claimed in claim 1, wherein: the input feeder line (4) and the output feeder line (5) are both radio frequency insulators, the impedance is 50 ohms, and the dielectric material of the radio frequency insulators is quartz glass.

6. A filter as claimed in claim 1, wherein: the bandwidth of the filter is 310MHz.

7. A filter as claimed in claim 1, wherein: the mode switching device (6) is made of brass and silver plating materials, and the mode switching device (6) is in an inverted L shape.

8. A filter as claimed in claim 3, characterized in that: the filter further comprises a plurality of screws (7), the screws (7) are respectively arranged in the head end resonance unit (31), the first resonance unit (32), the second resonance unit (33), the third resonance unit (34), the fourth resonance unit (35), the fifth resonance unit (36), the sixth resonance unit (37), the seventh resonance unit (38) and the tail end resonance unit (39), and the screws (7) are made of M1.2 stainless steel and are plated with silver on the outer surface.

9. A filter as claimed in claim 1, wherein: a first through hole (121) is formed in one side wall of the cavity (1), a second through hole (141) is formed in the other side wall of the cavity (1), the first through hole (121) and the second through hole (141) are located at two opposite ends, one end of the input feeder line (4) is exposed out of the first through hole (121), and one end of the output feeder line (5) is exposed out of the second through hole (141).

10. A filter as claimed in claim 9, wherein: the filter comprises a cover plate (2) and a fixing piece, wherein a plurality of first mounting holes (11) are formed in the outer wall of the cavity (1), a plurality of fixing holes (21) are formed in the cover plate (2), and the fixing piece is connected with the first mounting holes (11) through the fixing holes (21).