Novel cross coupling substrate integrated waveguide band-pass filter

A substrate-integrated waveguide and band-pass filter technology, applied in the field of radar systems, can solve the problems of large volume and poor out-of-band suppression characteristics, and achieve the effects of reducing the volume, improving the out-of-band suppression capability, and facilitating debugging.

Inactive Publication Date: 2013-09-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the filter of the present invention is to provide a A new type of cross-coupled substrate integrated waveguide (SIW) bandpass filter, the center frequency of the filter is 6.16GHz, the bandwidth is 280MHz. Low, the structure is tighter, and it also has good harmonic suppression ability

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  • Novel cross coupling substrate integrated waveguide band-pass filter
  • Novel cross coupling substrate integrated waveguide band-pass filter
  • Novel cross coupling substrate integrated waveguide band-pass filter

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Embodiment 1

[0040] see Figure 1~17 The novel cross-coupled substrate-integrated waveguide bandpass filter includes: a rectangular substrate-integrated waveguide resonator as a basic resonant unit; each resonant unit consists of a bottom metal layer (1), a top metal layer (3), an intermediate dielectric base A resonant cavity is surrounded by a sheet (2) and four rows of periodically arranged metallized through holes (4), which is characterized in that the magnetic coupling is realized through the inductive window (8) between adjacent resonant cavities, or through the metallization on the upper and lower sides of the cavity Serpentine grooves (9) are etched on the layer to realize electrical coupling; the input and output structures adopt coplanar waveguides (7) and are directly connected to the input and output 50 ohm microstrip lines (5, 6) to facilitate the realization of external Q value.

Embodiment 2

[0042] This embodiment is basically the same as Embodiment 1, and the special features are as follows: the adjacent resonant cavity and the coupling structure are symmetrical; the center of the cavity; the dielectric substrate (2) is made of material F 4 BM265, the bottom metal layer (1) and the top metal layer (3) of each rectangular substrate integrated waveguide resonator and metal plating layers such as metallized through holes (4) are metal materials with good electrical conductivity, which can reduce the filter insertion loss; The structure of the input and output is directly connected to the coplanar waveguide (7) by using the input and output 50 ohm microstrip lines (5, 6) to simplify the complexity; the coupling adopts a fourth-order cross-coupling structure, composed of A1, A2, A3, The four cross-couplings of A4 form a topological structure, in which the cross-couplings of A1 and A4 connected to the input and output respectively have electrical coupling characteristi...

Embodiment 3

[0044] This embodiment is based on SIW technology, figure 1 A schematic diagram of the SIW structure and size relationship is given. The SIW structure is a waveguide-like structure composed of a dielectric substrate 2, a bottom metal 1, a top metal 3 and a metallized through hole 4. It also has the advantages of small size, low cost, Excellent characteristics of easy processing and integration, the simulation model of the rectangular SIW resonator unit used in this paper is as follows image 3 As shown, by tuning the length of the rectangular cavity To control the center frequency of the filter, it is easy to debug.

[0045] According to the substrate integrated waveguide theory and filter synthesis theory, the filter design index requirement of the present invention is: center frequency =6.16GHz, bandwidth BW=280MHz, in-band return loss is 20dB, and the attenuation is greater than 30dB at 300MHz away from the center frequency; according to the generalized Chebyshev filter ...

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Abstract

The invention discloses a novel cross coupling substrate integrated waveguide band-pass filter. The filter comprises basic resonant units, wherein rectangular resonant cavities serve as the basic resonant units. Magnetic coupling is achieved among the resonant cavities in a windowing mode. S-shaped grooves are formed to achieve electrical coupling, and input and output are achieved by the adoption of a micro-strip-line and coplanar-waveguide structure. The rectangular SIW resonant cavities are formed by loading of periodic metal through holes in medium substrates. The electrical coupling is achieved through the structure that the S-shaped grooves with symmetrical central axes are formed in the upper metal face and the lower metal face of the two cavities, debugging is convenient, processing is easy, and the structure is suitable for the miniaturization design of the filter. The micro-strip-line and coplanar-waveguide structure is adopted for the input and the output, and the structure is that coplanar waveguides are directly connected with an input 50-Ohm micro strip line and an output 50-Ohm micro strip line, so that an extra transitional design is not needed for matching of ports, and complexity is simplified. The filter is compact in structure, improves out-of-band rejection, has better properties of restraining strays and separating signals, and meets requirements for the miniaturization and high properties of modernization radio communication.

Description

technical field [0001] The invention relates to a novel cross-coupling substrate-integrated waveguide band-pass filter, which belongs to the field of radar systems and has better performances of suppressing stray signals and separating signals while realizing the miniaturization of the filter. Background technique [0002] With the development of wireless communication technology, the services of microwave and millimeter wave communication systems are becoming more and more numerous, and the frequency resources are becoming increasingly tight. Microwave and millimeter wave circuits urgently need to develop rapidly in the direction of high performance, miniaturization, and low cost. Microwave filters are key components of radar systems and wireless communication systems, and are generally used to combine or separate signals in different frequency bands. In order to meet the needs of the development of modern radio technology, modern microwave filters need to have the characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/208
Inventor 李国辉程孝奇鉴浩彭太伟周华为
Owner SHANGHAI UNIV
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