Waveguide-to-right-angle low-pass filter

Abstract

The utility model discloses a waveguide-to-right angle low-pass filter in the field of filters, and aims to solve the problem of large size of a filter in the prior art, the waveguide-to-right angle low-pass filter comprises a cavity and a cover plate, the cavity and the cover plate are matched to form an internal cavity, and the internal cavity comprises an input channel, a middle tuning area and an output channel; the input channel and the output channel are of a double-ridge structure; the direction of the input channel and the direction of the output channel are bent, a resonant column and a coupling adjusting screw are arranged in the middle tuning area, and the distribution direction of the resonant column and the coupling adjusting screw has a turning right angle. The low-pass filter provided by the utility model is of an up-down structure, the cavity and the cover plate are matched up and down, bent double-ridge structures are arranged in the input channel and the output channel arranged in the low-pass filter, and the double-ridge structures are bent, so that the occupied space of the structure in one direction is reduced; the overall filter is small in size, low in energy consumption, convenient for 90-degree signal transmission and stable in transmission.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter field especially relates to a waveguide turns right angle low pass filter. BACKGROUND

[0002] Waveguide turns right angle low pass is a special type waveguide low pass filter, for realizing low pass filter function in waveguide system, it is usually by a waveguide turns right angle structure and proper filter element is formed, waveguide turns right angle structure can change the direction of transmission line, from horizontal or vertical direction turns to right angle direction, to realize the transmission and filter of signal, in waveguide turns right angle low pass, through reasonable design to structure and filter element's parameter, can realize the attenuation of high frequency signal, to realize the effect of low pass filter, this structure is usually used in the application occasion needing realizing low pass filter function in waveguide system, has higher performance and reliability, the overall volume of prior art low pass filter is big, and the transmission loss is big. SUMMARY

[0003] The utility model discloses a waveguide turns right angle low pass filter, through the arrangement of the structure in the bending double ridge structure and intermediate tuning area, to optimize the optimization design of filter internal structure, realize the volume of overall filter is small, and the energy consumption is small.

[0004] To solve the above technical problem, the following technical scheme is adopted:

[0005] The utility model provides a waveguide turns right angle low pass filter, including cavity and cover, the cavity and cover cooperation inside form internal cavity, including input channel, intermediate tuning area and output channel in the internal cavity,

[0006] The input channel and the output channel are double ridge structures,

[0007] The direction of the input channel and the output channel has bending, the intermediate tuning area is equipped with resonant column and coupling screw, and the distribution direction of the resonant column and the coupling screw has right angle.

[0008] Optionally, the cavity is sequentially provided with a cavity input channel, a first cavity resonant column, a resonant column hole, a tail cavity resonant column and a cavity output channel, the cavity input channel is sequentially provided with a cavity input waveguide channel, a cavity input single ridge step and a cavity input matching step, and the cavity output channel is sequentially provided with a cavity output waveguide channel, a cavity output single ridge step and a cavity output matching step.

[0009] Optionally, the cover plate is sequentially provided with a cover plate input channel, a front cavity frequency adjusting screw, a resonant column, a tail cavity frequency adjusting screw and a cover plate output channel, the cover plate input channel is provided with a cover plate input waveguide channel and a cover plate input single ridge step, the cover plate input single ridge step is connected with the cover plate input waveguide channel, the cover plate output channel is provided with a cover plate output waveguide channel and a cover plate output single ridge step, and the cover plate output single ridge step is connected with the cover plate output waveguide channel.

[0010] Optionally, the cavity input single ridge step, the cavity output single ridge step, the cover plate input single ridge step and the cover plate output single ridge step are all rectangular and all have a bending.

[0011] Optionally, the cavity input channel and the cover plate input channel cooperatively form the input channel, the cavity output channel and the cover plate output channel cooperatively form the output channel, the cavity input single ridge step and the cover plate input single ridge step form a double-ridge structure in the input channel, and the cavity output single ridge step and the cover plate output single ridge step form a double-ridge structure in the output channel.

[0012] Optionally, the resonant column hole is provided with five resonant column holes, namely a first resonant column hole, a second resonant column hole, a third resonant column hole, a fourth resonant column hole and a fifth resonant column hole, and the resonant column is provided with five resonant columns, namely a first resonant column, a second resonant column, a third resonant column, a fourth resonant column and a fifth resonant column, the five resonant column holes are matched with the five resonant columns, and the five resonant columns and the five resonant column holes are all arranged in an L shape.

[0013] Optionally, the cover plate is provided with eight coupling adjusting screws, namely a first coupling adjusting screw, a second coupling adjusting screw, a third coupling adjusting screw, a fourth coupling adjusting screw, a fifth coupling adjusting screw, a sixth coupling adjusting screw, a seventh coupling adjusting screw and an eighth coupling adjusting screw, the first coupling adjusting screw and the second coupling adjusting screw are sequentially arranged on one side of the fifth resonant column to the cover plate input channel, the third coupling adjusting screw is arranged between the fifth resonant column and the fourth resonant column, the fourth coupling adjusting screw is arranged between the fourth resonant column and the third resonant column, the fifth coupling adjusting screw is arranged between the third resonant column and the second resonant column, the sixth coupling adjusting screw is arranged between the second resonant column and the first resonant column, and the seventh coupling adjusting screw and the eighth coupling adjusting screw are sequentially arranged on one side of the first resonant column to the cover plate output channel.

[0014] Optionally, the cover plate input single ridge step is provided with a matching coupling adjusting screw.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] The low-pass filter has an upper and lower structure, the cavity and the cover plate are matched in an upper and lower mode, the input channel and the output channel are internally provided with the bent double-ridge structure, the double-ridge structure is bent, the structure in one direction is reduced, the structure in the middle tuning area is arranged in a right angle, the internal space structure design is optimized, and the overall filter has the advantages of small size, low energy consumption, convenient 90-degree signal transmission and stable transmission performance. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a cavity structure schematic diagram in the embodiment of the utility model;

[0018] Figure 2 is a cavity plane structure schematic diagram in the embodiment of the utility model;

[0019] Figure 3 is a cover plate plane structure schematic diagram in the embodiment of the utility model;

[0020] Figure 4 is a cover plate structure schematic diagram in the embodiment of the utility model;

[0021] Figure 5 is one of a waveguide right-angle low-pass filter overall structure schematic diagram in the embodiment of the utility model;

[0022] Figure 6 is the second of a waveguide right-angle low-pass filter overall structure schematic diagram in the embodiment of the utility model.

[0023] BRIEF DESCRIPTION OF DRAWINGS:

[0024] a, cavity; b, cover plate; 1, first cavity resonant column; 2, cavity input matching step; 3, cavity input single-ridge step; 4, cavity input waveguide channel, 5, first resonant column hole; 6, second resonant column hole; 7, third resonant column hole; 8, fourth resonant column hole; 9, fifth resonant column hole; 10, tail cavity resonant column; 11, cavity output matching step; 12, cavity output single-ridge step; 13, cavity output waveguide channel; 14, cover plate output waveguide channel; 15, cover plate output single-ridge step; 16, tail cavity frequency adjusting screw; 17, eighth coupling adjusting screw; 18, seventh coupling adjusting screw; 19, sixth coupling adjusting screw; 20, fifth coupling adjusting screw; 21, fourth coupling adjusting screw; 22, third coupling adjusting screw; 23, second coupling adjusting screw; 24, coupling adjusting screw; 25, first cavity frequency adjusting screw; 26, matching coupling adjusting screw; 27, cover plate input single-ridge step; 28, cover plate input waveguide channel; 29, fifth resonant column; 30, fourth resonant column; 31, third resonant column; 32, second resonant column; 33, first resonant column. DETAILED DESCRIPTION

[0025] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one example embodiment is actually only illustrative, but not as any limitation on the present application and its application or use.

[0026] Embodiment 1

[0027] As shown in the drawings, Figures 1-4 The embodiment provides a waveguide-to-low-pass filter, which comprises a cavity a and a cover plate b, the cavity a and the cover plate b are matched to form an internal cavity, the internal cavity comprises an input channel, an intermediate tuning area and an output channel,

[0028] The input channel and the output channel are double-ridge structures.

[0029] The input channel and the output channel have a bending structure, the intermediate tuning area is provided with a tuning column and a coupling tuning screw, and the distribution direction of the tuning column and the coupling tuning screw is a right-angle turning.

[0030] The double-ridge structure is that one ridge is arranged in the input channel and the output channel of the cavity respectively, one ridge is arranged on the input channel and the output channel of the cover plate a respectively, and the upper and lower two ridges are formed in the input channel and the output channel respectively by the upper and lower combination of the cavity a and the cover plate b, so that better transmission characteristics can be achieved in a wider frequency band. The input channel and the output channel are one-end bending structures, and the ridge structures on the cavity a and the cover plate b have the same bending structure parallel to the channel direction. The space utilization is improved, and other components or structures are better integrated. The distribution direction of the tuning column and the coupling tuning screw in the intermediate tuning area is a right-angle turning broken line arrangement, and the space layout of the intermediate tuning area is optimized.

[0031] In the embodiment, the cavity a and the cover plate b are matched and tightly connected, the internal space is reasonably arranged, the high-frequency signal is attenuated by the internal space structure and the filter elements arranged in the space to form a waveguide-to-low-pass filter, so that the low-pass filtering effect is achieved, the performance and reliability are high, and the whole filter has the advantages of small volume.

[0032] Embodiment 2

[0033] As shown in the drawings, Figures 1-6As shown, the embodiment based on embodiment 1 provides a waveguide to right-angle low-pass filter, which is different from embodiment 1 in that the cavity a is sequentially provided with a cavity input channel, a first cavity resonant column 1, a resonant column hole, a tail cavity resonant column 10 and a cavity output channel. The cavity input channel is sequentially provided with a cavity input waveguide channel 4, a cavity input single ridge step 3 and a cavity input matching step 2, one end of the cavity input single ridge step 3 is connected with the cavity input waveguide channel 4, the other end is connected with the cavity input matching step 2, and the first cavity resonant column 1 is arranged on the other side of the cavity input matching step 2. The cavity output channel is sequentially provided with a cavity output waveguide channel 13, a cavity output single ridge step 12 and a cavity output matching step 11, one end of the cavity output single ridge step 12 is connected with the cavity output waveguide channel 13, the other end is connected with the cavity output matching step 11, and the tail cavity resonant column 10 is arranged on the other side of the cavity output matching step 11.

[0034] The cavity input single ridge step 3 and the cavity output single ridge step 12 can be rectangular or other shapes, and in the embodiment, rectangular is selected, and the tail end of the cavity input single ridge step 3 and the cavity output single ridge step 12 has a bending structure, and the arrangement of the bending structure reduces the space occupation in one direction.

[0035] As shown in Figure 3 , Figure 4 , the cover plate b is sequentially provided with a cover plate input channel, a first cavity frequency adjusting screw 25, a resonant column, a tail cavity frequency adjusting screw 16 and a cover plate output channel, wherein the cover plate input channel is provided with a cover plate input waveguide channel 28 and a cover plate input single ridge step 27, one end of the cover plate input single ridge step 27 is connected with the cover plate input waveguide channel 28, and the other end is provided with the first cavity frequency adjusting screw 25, the cover plate output channel is provided with a cover plate output waveguide channel 14 and a cover plate output single ridge step 15, one end of the cover plate output single ridge step 15 is connected with the cover plate output waveguide channel 14, and the other end is provided with the tail cavity frequency adjusting screw 16.

[0036] The cover plate input single ridge step 27 and the cover plate output single ridge step 15 can be rectangular or other shapes, but the shape of the cover plate input single ridge step 27 is the same as that of the cavity input single ridge step 3, and the shape of the cover plate output single ridge step 15 is the same as that of the cavity output single ridge step 12. In the embodiment, rectangular is selected, and the tail end of the cover plate input single ridge step 27 has the same bending structure as the cavity input single ridge step 3, and the tail end of the cover plate output single ridge step 15 has the same bending shape as the cavity output single ridge step 12.

[0037] After the cavity a and the cover plate b are matched together, the cavity input waveguide channel 4 and the cover plate input waveguide channel 14 are matched to form an input waveguide channel, the cavity input single ridge step 3 inside and the cover plate input single ridge step 27 form a double ridge structure in the input channel, and the cavity output single ridge step 12 inside and the cover plate output single ridge step 15 form a double ridge structure in the output channel. The presence of the double ridge structure increases the capacitance between the waveguide walls, which makes the equivalent size of the waveguide smaller. The double ridge structure can use a shorter waveguide length to achieve the same filtering effect, thereby reducing the overall size of the filter.

[0038] The resonant column holes in the cavity a and the resonant columns on the cover plate b are matched, and the resonant columns are provided with five, namely the first resonant column 33, the second resonant column 32, the third resonant column 31, the fourth resonant column 30 and the fifth resonant column 29, and the resonant column holes are provided with five, namely the first resonant column hole 5, the second resonant column hole 6, the third resonant column hole 7, the fourth resonant column hole 8 and the fifth resonant column hole 9. The five resonant column holes and the five resonant columns are one-to-one corresponding, the first resonant column 33 is arranged in the first cavity resonant column hole 5, and the fifth resonant column 29 is arranged in the fifth resonant column hole 9.

[0039] The cover plate b is provided with eight coupling adjustment screws, namely the first coupling adjustment screw 24, the second coupling adjustment screw 23, the third coupling adjustment screw 22, the fourth coupling adjustment screw 21, the fifth coupling adjustment screw 20, the sixth coupling adjustment screw 19, the seventh coupling adjustment screw 18 and the eighth coupling adjustment screw 17. The first coupling adjustment screw 24 and the second coupling adjustment screw 23 are sequentially arranged on one side of the cover plate input channel of the fifth resonant column 29, the third coupling adjustment screw 22 is arranged between the fifth resonant column 29 and the fourth resonant column 30, the fourth coupling adjustment screw 21 is arranged between the fourth resonant column 30 and the third resonant column 31, the fifth coupling adjustment screw 20 is arranged between the third resonant column 31 and the second resonant column 32, the sixth coupling adjustment screw 19 is arranged between the second resonant column 32 and the first resonant column 33, and the seventh coupling adjustment screw 18 and the eighth coupling adjustment screw 17 are sequentially arranged on one side of the cover plate output channel of the first resonant column 33.

[0040] The first cavity frequency adjustment screw 25 on the cover plate b corresponds to the first cavity resonant column 1 in the cavity, and the tail cavity frequency adjustment screw 16 on the cover plate corresponds to the tail cavity resonant column 10 in the cavity. The tail end of the cover plate input single ridge step 27 on the cover plate is provided with a matching coupling adjustment screw 26 to strengthen the optimization adjustment of the transmission performance.

[0041] The resonant column interval arrangement and the inner wall jointly constitute a resonant cavity, and each resonant cavity has a specific resonant frequency, which mainly depends on the size and structure of the resonant cavity. By reasonably designing the interval of the resonant column, the resonant frequency of each resonant cavity can be accurately determined, and then the filtering characteristics of the entire filter are determined. After the size and structure of the resonant cavity are determined, the resonant cavities are reasonably arranged to maximize the space utilization rate in the filter. The resonant column L-shaped turn is arranged at a right angle, and the input channel and the output channel are provided with a bending structure. In a small space, sufficient structure is arranged, the overall structure of the filter is small, transmission in a small space is realized, and the advantages of low energy consumption are realized.

[0042] The coupling screw can accurately adjust the electromagnetic coupling strength between different parts in the filter. Inside the filter, the resonant cavities composed of each resonant column or the transmission line segments need appropriate coupling to realize the selection and transmission of signals of specific frequencies. By adjusting the position or depth of the coupling screw, the coupling degree of the electromagnetic field between adjacent parts can be changed. By arranging the coupling screw between two resonant cavities, the coupling of the transmission signal is realized.

[0043] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A waveguide-to-right-angle low-pass filter, characterized in that, It includes a cavity and a cover plate, which cooperate to form an internal cavity, and the internal cavity includes an input channel, an intermediate tuning area and an output channel; The input channel and the output channel have a double-ridge structure; The input channel and the output channel are bent in direction, and a resonant post and a coupling screw are provided in the intermediate tuning area. The distribution direction of the resonant post and the coupling screw is at a right angle.

2. The waveguide-to-right-angle low-pass filter according to claim 1, characterized in that, The cavity is provided with a cavity input channel, a first cavity resonant column, a resonant column hole, a tail cavity resonant column, and a cavity output channel in sequence. The cavity input channel is provided with a cavity input waveguide channel, a cavity input single-ridge step, and a cavity input matching step in sequence. The cavity output channel is provided with a cavity output waveguide channel, a cavity output single-ridge step, and a cavity output matching step in sequence.

3. The waveguide-to-right-angle low-pass filter according to claim 2, characterized in that, The cover plate contains, in sequence, a cover plate input channel, a first cavity frequency tuning screw, a resonant column, a tail cavity frequency tuning screw, and a cover plate output channel. The cover plate input channel contains a cover plate input waveguide channel and a cover plate input single ridge step, which are connected to the cover plate input waveguide channel. The cover plate output channel contains a cover plate output waveguide channel and a cover plate output single ridge step, which are connected to the cover plate output waveguide channel.

4. The waveguide-to-right-angle low-pass filter according to claim 3, characterized in that, The cavity input single-ridge step, the cavity output single-ridge step, the cover plate input single-ridge step, and the cover plate output single-ridge step are all rectangular and all have bends.

5. The waveguide-to-right-angle low-pass filter according to claim 3, characterized in that, The cavity input channel and the cover plate input channel work together to form the input channel, and the cavity output channel and the cover plate output channel work together to form the output channel. The cavity input single ridge step and the cover plate input single ridge step form a double ridge structure in the input channel, and the cavity output single ridge step and the cover plate output single ridge step form a double ridge structure in the output channel.

6. The waveguide-to-right-angle low-pass filter according to claim 3, characterized in that, The resonant post hole is provided with five holes, namely the first resonant post hole, the second resonant post hole, the third resonant post hole, the fourth resonant post hole and the fifth resonant post hole. The resonant post is provided with five holes, namely the first resonant post, the second resonant post, the third resonant post, the fourth resonant post and the fifth resonant post. The five resonant post holes are matched with the five resonant posts. The five resonant posts and the five resonant post holes are all arranged in an L-shape.

7. The waveguide-to-right-angle low-pass filter according to claim 6, characterized in that, The cover plate has eight coupling tuning screws, namely the first coupling tuning screw, the second coupling tuning screw, the third coupling tuning screw, the fourth coupling tuning screw, the fifth coupling tuning screw, the sixth coupling tuning screw, the seventh coupling tuning screw, and the eighth coupling tuning screw. The first and second coupling tuning screws are sequentially arranged on one side of the fifth resonant column into the cover plate input channel. The third coupling tuning screw is arranged between the fifth and fourth resonant columns. The fourth coupling tuning screw is arranged between the fourth and third resonant columns. The fifth coupling tuning screw is arranged between the third and second resonant columns. The sixth coupling tuning screw is arranged between the second and first resonant columns. The seventh and eighth coupling tuning screws are sequentially arranged on one side of the first resonant column into the cover plate output channel.

8. The waveguide-to-right-angle low-pass filter according to claim 3, characterized in that, The cover plate input single ridge step is equipped with a matching coupling screw.

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