阅读说明：本技术 一种波纹波导滤波器 (Corrugated waveguide filter ) 是由 曾志斌 姜秀萍 于 2021-05-17 设计创作，主要内容包括：本发明实施例公开了一种波纹波导滤波器,所述波纹波导滤波器包括：矩形波导；以及位于矩形波导两相对侧壁外侧表面的两组波纹波导结构；波纹波导结构包括：沿矩形波导轴向延伸的中隔板；以及由中隔板向中隔板两侧延伸的第一间隔板和第二间隔板；第一间隔板与第二间隔板相对于中隔板呈对称配置；在矩形波导的延伸方向上,波纹波导结构包括若干间隔排列的第一间隔板以及若干间隔排列的第二间隔板；相邻两第一间隔板之间形成第一波纹波导内腔,相邻两第二间隔板之间形成第二波纹波导内腔；第一波纹波导内腔和第二波纹波导内腔均贯穿矩形波导的侧壁与所述矩形波导的内腔连通。本滤波器在峰值功率30kW以上仍稳定正常工作,峰值功率容量提升6倍以上。(The embodiment of the invention discloses a corrugated waveguide filter, which comprises: a rectangular waveguide; and two groups of corrugated waveguide structures positioned on the outer side surfaces of two opposite side walls of the rectangular waveguide; the corrugated waveguide structure includes: a middle partition plate extending along the axial direction of the rectangular waveguide; the first partition plate and the second partition plate extend from the middle partition plate to two sides of the middle partition plate; the first partition plate and the second partition plate are symmetrically arranged relative to the middle partition plate; in the extending direction of the rectangular waveguide, the corrugated waveguide structure comprises a plurality of first partition plates arranged at intervals and a plurality of second partition plates arranged at intervals; a first corrugated waveguide inner cavity is formed between every two adjacent first partition plates, and a second corrugated waveguide inner cavity is formed between every two adjacent second partition plates; the first corrugated waveguide inner cavity and the second corrugated waveguide inner cavity penetrate through the side wall of the rectangular waveguide and are communicated with the inner cavity of the rectangular waveguide. The filter can still stably and normally work at the peak power of more than 30kW, and the peak power capacity is improved by more than 6 times.)

1. A corrugated waveguide filter, comprising:

a rectangular waveguide;

and two groups of corrugated waveguide structures which are combined and fixed on the outer side surfaces of two opposite side walls of the rectangular waveguide;

the corrugated waveguide structure includes:

a median septum extending axially along the rectangular waveguide; and

the first partition plate and the second partition plate extend from the middle partition plate to two sides of the middle partition plate;

the first partition plate and the second partition plate are symmetrically arranged relative to the middle partition plate;

in the extending direction of the rectangular waveguide, the corrugated waveguide structure comprises a plurality of first partition plates arranged at intervals and a plurality of second partition plates arranged at intervals;

a first corrugated waveguide inner cavity is formed between every two adjacent first partition plates, and a second corrugated waveguide inner cavity is formed between every two adjacent second partition plates;

the first corrugated waveguide inner cavity and the second corrugated waveguide inner cavity penetrate through the side wall of the rectangular waveguide and are communicated with the inner cavity of the rectangular waveguide.

2. The corrugated waveguide filter of claim 1, further comprising a wave absorbing member disposed on a surface of the corrugated waveguide structure.

3. The corrugated waveguide filter of claim 2, further comprising a housing disposed around the wave absorbing member;

the shell is formed by splicing two half-structures with the same shape.

4. The corrugated waveguide filter according to claim 1, wherein the rectangular waveguide includes a major axis side and a minor axis side, and the corrugated waveguide structure is located on the major axis side of the rectangular waveguide.

5. The corrugated waveguide filter according to claim 1, wherein the number of cycles of the first and second corrugated waveguide cavities is not less than 8 in the extending direction of the rectangular waveguide.

6. The corrugated waveguide filter according to claim 1, wherein the first and second spacer plates each have a thickness t, wherein t is 1.5mm ≦ t ≦ 3 mm.

7. The corrugated waveguide filter of claim 1, wherein the thickness of the septum is d, wherein d is 1.5mm ≦ 3 mm.

8. The corrugated waveguide filter according to claim 1, wherein the rectangular waveguide aperture has a first side length of a and a second side length of b;

the first corrugated waveguide inner cavity and the second corrugated waveguide inner cavity are same in shape, the corrugated waveguide inner cavity and the structural section of the penetrating part of the rectangular waveguide comprise a wide side and a narrow side, and the length of the wide side is a₁The length of the narrow side is b₁；

A is a₁＝(a-t)/2；

B is₁＝b/4。

9. The corrugated waveguide filter of claim 2, wherein the wave absorbing member is made of crystalline silicon.

10. The corrugated waveguide filter according to claim 1, wherein projections of the first and second corrugated waveguide cavities in an extending direction of the rectangular waveguide are right-angled trapezoidal structures.

Technical Field

The invention relates to the technical field of microwave components. And more particularly, to a corrugated waveguide filter.

Background

In microwave systems such as mixers and frequency multipliers, in addition to obtaining a main signal of a desired operating frequency, an interference signal of several higher harmonic frequencies is also excited. E.g. with a frequency f₀After the excitation signal of/2 passes through the frequency multiplier, the obtained working frequency is f₀Is mainlyThe signal, but also the harmonic frequency 3f₀/2、4f₀Interference signal of/2, wherein the harmonic frequency is 4f₀The interference signal amplitude of/2 is small, the influence on the system is ignored, and the harmonic frequency is 3f₀The interference signal amplitude of/2 is large, and the system use is adversely affected. In order to ensure the normal and stable operation of the system, a filter with frequency selection function is connected behind the frequency multiplier to ensure the working frequency f₀Passes the main signal of (3), and the harmonic frequency 3f₀And filtering out the interference signal of/2 to meet the use requirement of the system.

A corrugated waveguide filter is generally composed of a main waveguide and a metal diaphragm or a metal rod or the like. The cross section of the main waveguide is rectangular, the metal diaphragms are positioned on two sides of the wide side of the main waveguide, and the metal rod is positioned in the center of the wide side of the main waveguide. By designing the appropriate dimensions of the metal diaphragm or metal rod, it is possible to operate at a frequency of 3f₀/2 resonance absorption occurs, thereby reducing the harmonic frequency 3f₀2 signal rejection, and operating frequency f₀May pass through. The metal diaphragms or metal rods greatly change the electromagnetic field distribution in the main waveguide, the power capacity of the filter is usually greatly reduced, and high-power sparking breakdown is very easy to occur in a high-power system, so that the metal diaphragms or metal rods cannot be applied.

Disclosure of Invention

In order to solve the above problems, the present invention provides a corrugated waveguide filter to solve the problems of low power tolerance and high power breakdown easily occurring under high power condition of the conventional corrugated waveguide filter with a metal diaphragm or metal rod structure.

In order to achieve the purpose, the invention adopts the following technical scheme:

a corrugated waveguide filter comprising:

a rectangular waveguide;

and two groups of corrugated waveguide structures which are combined and fixed on the outer side surfaces of two opposite side walls of the rectangular waveguide;

the corrugated waveguide structure includes:

a median septum extending axially along the rectangular waveguide; and

the first partition plate and the second partition plate extend from the middle partition plate to two sides of the middle partition plate;

the first partition plate and the second partition plate are symmetrically arranged relative to the middle partition plate;

in the extending direction of the rectangular waveguide, the corrugated waveguide structure comprises a plurality of first partition plates arranged at intervals and a plurality of second partition plates arranged at intervals;

a first corrugated waveguide inner cavity is formed between every two adjacent first partition plates, and a second corrugated waveguide inner cavity is formed between every two adjacent second partition plates;

the first corrugated waveguide inner cavity and the second corrugated waveguide inner cavity penetrate through the side wall of the rectangular waveguide and are communicated with the inner cavity of the rectangular waveguide.

In addition, preferably, the corrugated waveguide filter further comprises a wave absorbing component sleeved on the surface of the corrugated waveguide structure.

In addition, preferably, the corrugated waveguide filter further comprises a shell sleeved on the periphery of the wave absorbing component;

the shell is formed by splicing two half-structures with the same shape.

In addition, preferably, the rectangular waveguide includes a major axis side and a minor axis side, and the corrugated waveguide structure is located on the major axis side of the rectangular waveguide.

In addition, it is preferable that the number of cycles of the first corrugated waveguide cavity and the second corrugated waveguide cavity is not less than 8 in the extending direction of the rectangular waveguide.

In addition, preferably, the thicknesses of the first spacing plate and the second spacing plate are both t, wherein t is more than or equal to 1.5mm and less than or equal to 3 mm.

In addition, preferably, the thickness of the partition plate is d, wherein d is more than or equal to 1.5mm and less than or equal to 3 mm.

In addition, preferably, the length of a first side of the aperture of the rectangular waveguide is a, and the length of a second side of the aperture of the rectangular waveguide is b;

the first corrugated waveguide cavity and the second corrugated waveguide cavity are identical in shape, and the corrugationsThe waveguide cavity and the structural section of the through part of the rectangular waveguide comprise a wide side and a narrow side, and the length of the wide side is a₁The length of the narrow side is b₁；

Said a1 ═ 2 (a-t);

b1 is b/4.

In addition, preferably, the wave-absorbing component is made of crystalline silicon.

In addition, it is preferable that projections of the first corrugated waveguide cavity and the second corrugated waveguide cavity in the extending direction of the rectangular waveguide have a right-angled trapezoid structure.

The beneficial effect of this application is as follows:

to solve the technical problems in the prior art, embodiments of the present application provide a corrugated waveguide filter, in which a corrugated waveguide structure is disposed on outer side surfaces of two opposite sidewalls of a rectangular waveguide, and a cutoff frequency f of a corrugated waveguide inner cavity formed by the corrugated waveguide structure_jSatisfy f₀＜f_j＜3f₀/2, so that the operating frequency f₀Can not enter the corrugated waveguide structure, can only be completely output from the rectangular waveguide, and has the harmonic frequency of 3f₀The interference signal of/2 can enter the corrugated waveguide structure, most of the interference signal is absorbed by the peripheral wave-absorbing component through the inner cavity of the corrugated waveguide, and the output from the rectangular waveguide is very little. The corrugated waveguide structure is small in size and distributed on the rectangular waveguide, so that the electromagnetic field distribution of the rectangular waveguide is slightly changed and is equivalent to that of the hollow waveguide, and the borne power capacity of the corrugated waveguide structure is equivalent to that of the hollow waveguide and far higher than that of a traditional waveguide filter with a metal diaphragm or metal rod structure. In the ku waveband, the high-power ignition and burning phenomena frequently occur in the traditional filter with a metal diaphragm or metal rod structure at the peak power of 5kW, but the filter provided by the embodiment of the invention still stably and normally works at the peak power of more than 30kW, and the peak power capacity is improved by more than 6 times.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic external view of a corrugated waveguide filter according to the present invention.

Fig. 2 shows a schematic structural diagram of a corrugated waveguide filter provided by the present invention.

Fig. 3 shows a front view of a corrugated waveguide filter provided by the present invention.

Fig. 4 shows a top cross-sectional view of a corrugated waveguide filter provided by the present invention.

Detailed Description

In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is further noted that, in the description of the present application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

To overcome the defects in the prior art, an embodiment of the present invention provides a corrugated waveguide filter, which is shown in fig. 1 and 2, and includes:

a rectangular waveguide 1;

and two groups of corrugated waveguide structures 2 combined and fixed on the outer side surfaces of two opposite side walls of the rectangular waveguide 1, wherein in one embodiment, the two groups of corrugated waveguide structures 2 are symmetrically arranged relative to the rectangular waveguide 1;

the corrugated waveguide structure 2 includes:

a middle partition plate 3 extending in the axial direction of the rectangular waveguide 1; and

a first partition plate 4 and a second partition plate 5 extending from the middle partition plate 3 to both sides of the middle partition plate 3;

the first partition plate 4 and the second partition plate 5 are symmetrically arranged with respect to the middle partition plate 3;

in the extending direction of the rectangular waveguide 1, the corrugated waveguide structure 2 comprises a plurality of first partition plates 4 arranged at intervals and a plurality of second partition plates 5 arranged at intervals;

a first corrugated waveguide inner cavity 6 is formed between two adjacent first partition plates 4, a second corrugated waveguide inner cavity 7 is formed between two adjacent second partition plates 5, and in a specific example, the first corrugated waveguide inner cavity 6 and the second corrugated waveguide inner cavity 7 are symmetrically arranged;

in this embodiment, the corrugated waveguide structure 2 and the rectangular waveguide 1 are integrally formed by a welding process to form a whole, and the first corrugated waveguide cavity 6 and the second corrugated waveguide cavity 7 both penetrate through the side wall of the rectangular waveguide 1 and communicate with the cavity of the rectangular waveguide 1.

In a specific embodiment, the filter includes a wave-absorbing component 8 tightly sleeved on the surface of the corrugated waveguide structure 2, the wave-absorbing component 8 is designed as two U-shaped components with the same structure, and the two U-shaped components are respectively tightly sleeved on the surfaces of the two corrugated waveguide structures 2 and are adhered to the corrugated waveguide structures through silicon rubber. The wave-absorbing component 8 is used for absorbing interference signals output from the first corrugated waveguide inner cavity 6 and the second corrugated waveguide inner cavity 7, and the arrangement of the wave-absorbing component 8 is also beneficial to increasing the microwave absorption efficiency of unit length.

In one embodiment, the filter further includes a housing 9 sleeved on the periphery of the wave-absorbing component 8, the housing 9 is formed by splicing two half-structures with the same shape, and the two half-structures are respectively sleeved on the periphery of the wave-absorbing component 8 and are combined and fixed with the rectangular waveguide 1 through screws.

In a specific example, the rectangular waveguide 1 includes a long axis side and a short axis side, the corrugated waveguide structures 2 are located on the long axis side of the rectangular waveguide 1, and the two groups of corrugated waveguide structures 2 are respectively located on the outer side surfaces of the two opposite sidewalls of the long axis side of the rectangular waveguide 1 and are symmetrically arranged.

In a specific embodiment, in the extending direction of the rectangular waveguide 1, the first corrugated waveguide cavity 6 and the second corrugated waveguide cavity 7 are symmetrically arranged with respect to the middle partition board 3, the number of cycles of the first corrugated waveguide cavity 6 and the second corrugated waveguide cavity 7 is the same, that is, in the extending direction of the rectangular waveguide 1, the corrugated waveguide structure 2 at least includes 8 first corrugated waveguide cavities 6 and the number of second corrugated waveguide cavities 7 corresponding to the first corrugated waveguide cavities 6 is the same, in an embodiment, as shown in fig. 4, in the extending direction of the rectangular waveguide 1, the period of the corrugated waveguide cavities is 10, that is, the corrugated waveguide structure 2 includes 10 first corrugated waveguide cavities 6 and second corrugated waveguide cavities 7.

In one embodiment, the first partition plate 4 and the second partition plate 5 are symmetrically arranged relative to the middle partition plate 3, the first partition plate 4 and the second partition plate 5 are identical in shape, and the thickness t in the extending direction of the rectangular waveguide 1 is 1.5mm-3 mm.

In a specific example, the thickness of the middle partition board 2 is d, specifically, 1.5mm ≦ d ≦ 3 mm.

In a specific embodiment, the rectangular waveguide 1 has a standard rectangular waveguide aperture, and as shown in fig. 3, the aperture of the rectangular waveguide 1 has a wide side a and a narrow side b; first ripple waveguide inner chamber 6 and second ripple waveguide inner chamber 7 are in projection on the extending direction of rectangular waveguide 1 is right trapezoid, first ripple waveguide inner chamber 6 is the same with second ripple waveguide inner chamber 7's shape, combines fig. 4 to show, first ripple waveguide inner chamber 6 or second ripple waveguide inner chamber 7 with the structural cross-section that rectangular waveguide 1 link up the department includes wide avris and narrow avris, and the length on wide avris is a₁The length of the narrow side is b₁. Wherein:

a₁＝(a-t)/2；

b₁＝b/4。

in a specific embodiment, the wave-absorbing component 8 is made of crystalline silicon.

The filter provided by the embodiment has the working frequency f when in work₀Has a main signal and harmonic frequency of 3f₀The interference signal of/2 enters the input port of the rectangular waveguide 1 at the same time. The sizes of the wide edge and the narrow edge of the corrugated waveguide cavity are respectively a₁And b₁According to the waveguide transmission theory, the cutoff frequency of the corrugated waveguide cavity is f_j＝300/a₁(in the formula, f_jHas the unit of GHz, a₁Unit of (d) is mm), by selecting proper t during design, f can be enabled to be_jIs located in the middle of the upper frequency of the operating frequency range and the lower frequency of the harmonic frequency range, i.e. satisfies f₀＜f_j＜3f₀2, so that the working frequency f can be better ensured₀Passes through the rectangular waveguide 1 and the harmonic frequency 3f₀The interference signal of/2 enters the corrugated waveguide structure 2 and is absorbed by the wave absorbing component 8 at the periphery. The ripple waveguide attenuates by approximately 3dB per period, so after 10 periods, a total ofThe attenuation is 30dB, namely, the interference signal input from the rectangular waveguide 1 is absorbed by 99.9% after 10 periods, and the output is only 0.1%.

The filter provided by the present embodiment is formed by providing the corrugated waveguide structures 2 on the outer side surfaces of the two opposite sidewalls of the rectangular waveguide 1, due to the cut-off frequency f of the corrugated waveguide cavity formed by the corrugated waveguide structures 2_jSatisfy f₀＜f_j＜3f₀/2, so that the operating frequency f₀Cannot enter the corrugated waveguide structure 2, can only be completely output from the rectangular waveguide 1, and has the harmonic frequency 3f₀The interference signal of/2 can enter the corrugated waveguide structure 2, most of the interference signal is absorbed by the peripheral wave-absorbing component 8 through the inner cavity of the corrugated waveguide, and the output from the rectangular waveguide 1 is very little. Because the corrugated waveguide structure 2 is small in size and distributed on the rectangular waveguide 1, the electromagnetic field distribution of the rectangular waveguide 1 is changed slightly and is equivalent to that of an empty waveguide, and the borne power capacity of the corrugated waveguide structure is equivalent to that of the empty waveguide and is far higher than that of a traditional waveguide filter with a metal diaphragm or metal rod structure. In the ku waveband, the high-power ignition and burning phenomena frequently occur in the traditional filter with a metal diaphragm or metal rod structure at the peak power of 5kW, but the filter provided by the embodiment of the invention still stably and normally works at the peak power of more than 30kW, and the peak power capacity is improved by more than 6 times.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.