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A millimeter wave siw filter and design method thereof

A filter, millimeter wave technology, applied in waveguide-type devices, instruments, computing and other directions, can solve the problems of design method, design details are not perfect, the advantages of SIW filter are not fully exerted, etc., to achieve high out-of-band suppression, rectangular Smaller, smaller volume effect

Active Publication Date: 2018-06-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Claims
  • Application Information

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Problems solved by technology

At present, filters designed using SIW have been applied in the centimeter band, but due to imperfect design methods and design details, the advantages of SIW filters have not been fully utilized

Method used

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  • A millimeter wave siw filter and design method thereof
  • A millimeter wave siw filter and design method thereof
  • A millimeter wave siw filter and design method thereof

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Embodiment Construction

[0020] Now illustrate the specific content of the present invention with a specific embodiment. The project indicators are as follows: working in the Ka band, the center frequency is 37GHz, the passband loss is 1db, the bandwidth is 1GHz, and the suppression at 0.5GHz outside the band is 30db. According to the project index, choose to use the 8th order filter to realize.

[0021] Step 1, the 8th-order Jacobian elliptic function as a transfer function The characteristic function F 8 (jw), with the passband ripple 0.1db and the stopband ripple 50db, the zero pole is calculated. The four normalized poles are 0.2804, 0.7089, 0.9189, 0.9923, and the four normalized zeros are 3.9437, 1.5599, 1.2035, 1.1145. In the denominator of the characteristic function, remove the item related to the farthest zero point 3.9437, bring it into the transfer function expression, and modify it into a quasi-elliptic function.

[0022] Step 2, extract the normalized coupling matrix through the r...

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Abstract

The invention relates to microwave and millimeter wave technologies, in particular to an S-band SIW double-ring ferrite phase shifter. It includes a section of SIW transmission line and two identical ferrite square rings symmetrically arranged in the SIW transmission line, and also includes a dielectric sheet arranged in the middle of the two ferrite square rings, the two ferrite square rings and the dielectric sheet Closely attached; the height of the ferrite square ring is equal to that of the SIW and the dielectric sheet, the wall thickness is 1mm‑2mm, the width is less than half of the SIW width, the length is equal to the SIW length, the dielectric sheet thickness is less than 2mm, and the length is equal to the SIW length. The invention has the following advantages: the appearance of the TM mode is suppressed, and the cut-off frequency of the high-order mode is delayed; the volume of the phase shifter is smaller than that of the traditional waveguide phase shifter; the SIW filled with the dielectric has a larger breakdown voltage than the waveguide.

Description

technical field [0001] The invention relates to microwave and millimeter wave technologies, in particular to a millimeter wave SIW filter. Background technique [0002] In the past few decades, microwave technology and millimeter wave technology have made great progress, and great progress has also been made in filters, a microwave and millimeter wave passive device widely used in communication systems. Traditional filters can be roughly divided into two types: Chebyshev type and elliptic function type. Both types of filters have their own disadvantages. The Chebyshev type filter has a simple structure but poor frequency selection characteristics. The elliptic function type filter has excellent performance, but the structure is difficult to realize in engineering. Since the 1980s, a quasi-elliptic function filter, or generalized Chebyshev filter, which combines the advantages of the two filters, has been proposed and has been used more and more. [0003] At present, the de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/207G06F17/50
Inventor 邓龙江黄崇维张林博孙逊汪晓光陈良
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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