WR-5 frequency band quasi-elliptic function waveguide band-pass filter

Abstract

The utility model relates to a WR-5 frequency band quasi-elliptic function waveguide band-pass filter, which comprises an input waveguide S positioned on the right side, an output waveguide L positioned on the left side and a fifth-order waveguide filter positioned between the input waveguide S and the output waveguide L, a single-zero-point suppression resonator is arranged between the output waveguide L and the fifth-order waveguide filter and comprises a sixth resonant cavity, and the sixth resonant cavity protrudes out of the top of the output waveguide L. According to the utility model, the working frequency range is 170.4 GHz-187.3 GHz, and the 3dB relative bandwidth can reach 9.48%.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter related technical field especially, it relates to a WR-5 frequency band quasi elliptic function waveguide band pass filter, specifically relates to a WR-5 frequency band quasi elliptic function waveguide band pass filter based on TE301 mode and suppression resonant cavity. BACKGROUND

[0002] Terahertz (THz) waves, defined as 0.3 to 3 THz, have great potential in ultra-high-speed wireless communication, atmospheric monitoring, medical imaging and other applications. Band pass filter is an indispensable part of the front end of the terahertz system, and the band pass filter (BPF) with low insertion loss and high selectivity is what people expect. At the same time, high frequency selectivity is also the research hotspot of terahertz band pass filter. Elliptical and pseudo-elliptical filters with zero points at limited frequencies provide the best solution, which can realize sharp cut-off edge and low insertion loss at the same time, and the filter order is low.

[0003] After a large amount of retrieval, it is found that the Chinese patent No. CN208062235U discloses a rectangular waveguide dual-mode resonant cavity, which includes a rectangular waveguide single-mode resonant cavity, the same positions of the upper and lower H surfaces are respectively protruded upward and downward by different heights, respectively forming a section of rectangular vertical waveguide with closed upper end and a section of rectangular vertical waveguide with closed lower end, and the projections of the two sections of rectangular vertical waveguide on the H surface of the rectangular waveguide single-mode resonant cavity completely coincide. The utility model also discloses a waveguide dual-mode filter and a dual-mode duplexer. The utility model waveguide dual-mode filter realizes transmission zero point through the mode of multimode, has more excellent performance; the utility model waveguide dual-mode filter can work in E frequency band or higher frequency band, and only a few resonant cavities are needed to realize the suppression requirement of the filter with ordinary Chebyshev response, which adopts more resonant cavities, so that the utility model has better insertion loss and group delay performance.

[0004] In summary, the existing filter has narrow working frequency band and low frequency, and insufficient bandwidth.

[0005] In view of the above-mentioned defects, the present inventor actively researches and innovates to create a WR-5 frequency band quasi elliptic function waveguide band pass filter, so that it has better industrial utilization value. UTILITY MODEL CONTENT

[0006] To solve any one of the above technical problems, the utility model aims to provide a WR-5 frequency band quasi elliptic function waveguide band pass filter.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0008] A WR-5 frequency band quasi-elliptic function waveguide band-pass filter comprises an input waveguide on the right side, an output waveguide on the left side, and a five-order waveguide filter between the input waveguide and the output waveguide;

[0009] The five-order waveguide filter comprises, in sequence from right to left, a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, and a fifth resonant cavity, and the first resonant cavity, the second resonant cavity, the third resonant cavity, the fourth resonant cavity, and the fifth resonant cavity are distributed along the front-back direction;

[0010] A single-zero-point suppression resonator is arranged between the output waveguide and the five-order waveguide filter, and the single-zero-point suppression resonator comprises a sixth resonant cavity, and the sixth resonant cavity is arranged protruding from the top of the output waveguide.

[0011] As a further improvement of the utility model, the first resonant cavity and the fourth resonant cavity are symmetrically distributed relative to the third resonant cavity, and the second resonant cavity and the fourth resonant cavity are symmetrically distributed relative to the third resonant cavity.

[0012] As a further improvement of the utility model, the input waveguide and the output waveguide are symmetrically distributed.

[0013] As a further improvement of the utility model, the input waveguide and the output waveguide are both standard WR-5 waveguides.

[0014] As a further improvement of the utility model, the input waveguide and the first resonant cavity, and the fifth resonant cavity and the sixth resonant cavity are connected together through magnetic coupling structures of N-shaped structures.

[0015] As a further improvement of the utility model, the second resonant cavity and the third resonant cavity, the third resonant cavity and the fourth resonant cavity, and the fourth resonant cavity and the fifth resonant cavity are connected together through magnetic coupling structures of H-shaped structures.

[0016] As a further improvement of the utility model, the magnetic coupling structure is composed of an inductive diaphragm.

[0017] By the above scheme, the utility model has at least the following advantages:

[0018] 1. Wide frequency band: the working frequency band is 170.4GHz-187.3GHz, and the 3dB relative bandwidth can reach 9.48%;

[0019] 2. High rectangular coefficient: the rectangular coefficient can reach 0.83;

[0020] 3. Small overall structure, easy to process and use.

[0021] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, the following is the preferred embodiment of the present application and the detailed description of the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below, it should be understood that the following drawings only show some embodiments of the present application, therefore should not be regarded as a limitation on the scope, for those skilled in the art, without making creative efforts, all other embodiments obtained according to these drawings also belong to the scope of protection of the present application.

[0023] Fig. 1 is a structural schematic diagram of a WR-5 frequency band quasi-elliptic function waveguide band-pass filter of the present application;

[0024] Fig. 2 is a filter topology structure schematic diagram of the present application;

[0025] Fig. 3 is a filter simulation result schematic diagram of the present application.

[0026] In the drawings, the meanings of various reference signs are as follows.

[0027] Input waveguide S, output waveguide L;

[0028] First resonant cavity R1, second resonant cavity R2, third resonant cavity R3, fourth resonant cavity R4, fifth resonant cavity R5, sixth resonant cavity R6. DETAILED DESCRIPTION

[0029] The specific embodiments of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0030] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

[0031] Example

[0032] like Figs. 1-3 As shown,

[0033] A WR-5 band quasi-elliptic function waveguide bandpass filter includes an input waveguide S on the right, an output waveguide L on the left, and a fifth-order waveguide filter located between the input waveguide S and the output waveguide L. The input waveguide S and the output waveguide L are symmetrically distributed. Both the input waveguide S and the output waveguide L are standard WR-5 waveguides.

[0034] 1. The fifth-order waveguide filter comprises, from right to left, a first resonant cavity R1, a second resonant cavity R2, a third resonant cavity R3, a fourth resonant cavity R4, and a fifth resonant cavity R5. These cavities are distributed along the front-to-back direction. The first and fourth resonant cavities R1 and R4 are symmetrically distributed with respect to the third resonant cavity R3, and the second and fourth resonant cavities R2 and R4 are also symmetrically distributed with respect to the third resonant cavity R3.

[0035] 2. A single zero-point suppression resonator is provided between the output waveguide L and the fifth-order waveguide filter. The single zero-point suppression resonator includes a sixth resonant cavity R6, which protrudes from the top of the output waveguide L.

[0036] 3. The input waveguide S is connected to the first resonant cavity R1, and the fifth resonant cavity R5 is connected to the sixth resonant cavity R6 through an N-type magnetic coupling structure. The second resonant cavity R2 is connected to the third resonant cavity R3, the third resonant cavity R3 is connected to the fourth resonant cavity R4, and the fourth resonant cavity R4 is connected to the fifth resonant cavity R5 through an H-type magnetic coupling structure.

[0037] The aforementioned magnetic coupling structure is composed of an inductive diaphragm.

[0038] This utility model relates to a TE-based 301 The WR-5 band quasi-elliptic function waveguide bandpass filter with mode and suppression resonant cavity is specifically based on a rectangular waveguide. 301 The mode and the single-zero suppression resonator form two independent zeros on both sides of the passband to achieve high selectivity, ultimately realizing the WR-5 band quasi-elliptic function waveguide bandpass filter.

[0039] This invention utilizes a TE based on a rectangular waveguide. 301 Based on the mode and the single-zero suppression resonant cavity, a waveguide bandpass filter scheme with WR-5 frequency band, miniaturized structure, high rectangular coefficient, and easy fabrication is proposed.

[0040] The utility model discloses the following technical scheme is adopted to realize:

[0041] A kind of based on rectangular waveguide TE 301 Mode resonator and single zero-point suppression resonator's terahertz quasi-elliptic function band-pass filter with two zeros is designed.In order to realize wideband response and high selectivity in low stopband, first, a five-order filter about rectangular waveguide TE 301 Mode resonator geometric center symmetry is designed, then single zero-point suppression resonator is placed in filter one end, to improve the selectivity of upper stopband, finally obtains a high rectangular coefficient band-pass filter, and can be independently controlled the position of zero by adjusting the size of the two resonant cavities.

[0042] In Fig. 2 , wherein R6 represents suppression resonant cavity (i.e. the sixth resonant cavity R6), R3 represents the TE 301 Mode in third resonant cavity R3, R3' represents the TE 102 Mode in third resonant cavity R3.

[0043] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0044] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, can be detachable connection, or integrally connected, can be mechanical connection, can be electrical connection, can be directly connected, or indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0045] The above merely is preferred implementation manner of the present application, and is not used for limiting the present application, it should be pointed out, for ordinary skilled person in the technical field, on the premise of not departing from the technical principle of the present application, can also make several improvements and variations, these improvements and variations also should be regarded as the protection scope of the present application.

Claims

1. A WR-5 band quasi-elliptic function waveguide bandpass filter, comprising an input waveguide (S) located on the right side, an output waveguide (L) located on the left side, and a five-order waveguide filter located between the input waveguide (S) and the output waveguide (L); characterized in that: the five-order waveguide filter comprises, in order from right to left, a first resonant cavity (R1), a second resonant cavity (R2), a third resonant cavity (R3), a fourth resonant cavity (R4), and a fifth resonant cavity (R5), and the first resonant cavity (R1), the second resonant cavity (R2), the third resonant cavity (R3), the fourth resonant cavity (R4), and the fifth resonant cavity (R5) are all distributed along the front-back direction; a single-zero-point suppression resonator is arranged between the output waveguide (L) and the five-order waveguide filter, and the single-zero-point suppression resonator comprises a sixth resonant cavity (R6), and the sixth resonant cavity (R6) is arranged protruding from the top of the output waveguide (L).

2. A WR-5 band quasi-elliptic function waveguide bandpass filter as claimed in claim 1, characterized in that, The first resonant cavity (R1) and the fourth resonant cavity (R4) are symmetrically distributed left and right relative to the third resonant cavity (R3), and the second resonant cavity (R2) and the fourth resonant cavity (R4) are symmetrically distributed left and right relative to the third resonant cavity (R3).

3. A WR-5 band quasi-elliptic function waveguide bandpass filter as claimed in claim 1, characterized in that, The input waveguide (S) and the output waveguide (L) are symmetrically distributed left and right.

4. A WR-5 band quasi-elliptic function waveguide bandpass filter as claimed in claim 1, characterized by, The input waveguide (S) and the output waveguide (L) are both standard WR-5 waveguides.

5. A WR-5 band quasi-elliptic function waveguide bandpass filter as claimed in claim 1, characterized by, The input waveguide (S) and the first resonant cavity (R1), and the fifth resonant cavity (R5) and the sixth resonant cavity (R6) are connected together through an N-shaped magnetic coupling structure.

6. A WR-5 band quasi-elliptic function waveguide bandpass filter as claimed in claim 1, characterized by, The second resonant cavity (R2) and the third resonant cavity (R3), the third resonant cavity (R3) and the fourth resonant cavity (R4), and the fourth resonant cavity (R4) and the fifth resonant cavity (R5) are connected together through an H-shaped magnetic coupling structure.

7. A WR-5 band quasi-elliptic function waveguide bandpass filter as claimed in any one of claims 5 or 6, characterized in that, The magnetic coupling structure is composed of an inductive diaphragm.

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