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Microstrip bandpass filter and design method thereof

A band-pass filter and filter technology, applied in the field of communication, can solve the problems of poor frequency selectivity and large size, and achieve the effects of small size, easy debugging, and simple design process

Inactive Publication Date: 2018-08-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to provide a new type of microstrip bandpass filter in order to overcome the shortcomings of the existing microstrip bandpass filter, such as poor frequency selectivity and large size. Transmission zero, which can effectively improve frequency selectivity; generate a third transmission zero at the specified frequency to improve out-of-band rejection, and has the advantages of high performance, small size and easy design

Method used

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  • Microstrip bandpass filter and design method thereof
  • Microstrip bandpass filter and design method thereof
  • Microstrip bandpass filter and design method thereof

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Embodiment Construction

[0025] In order to embody the inventiveness and novelty of the present invention, the physical mechanism of the microstrip bandpass filter is deeply analyzed below. During the analysis, it will be explained in conjunction with the drawings and specific examples, but the implementation manner of the present invention is not limited thereto. Without loss of generality, the microstrip bandpass filter of the present invention is used to realize a bandpass frequency response, the center frequency is 2.34GHz, the relative bandwidth is 39%, and the in-band return loss is greater than 20dB. The impedance of the input and output feed lines was set to 50Ω. The ideal bandpass frequency response is as Figure 5 shown.

[0026]According to the design steps of the microstrip bandpass filter as mentioned above, the first step is to determine Figure 4 Individual element values ​​of the lumped parameter equivalent circuit in . In this embodiment, it is calculated that: R S =R L =50Ω,K ...

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Abstract

The invention belongs to the technical field of communication, and provides a microstrip bandpass filter in order to overcome the disadvantages of poor frequency selectivity, large size and the like of existing microstrip bandpass filters. A physical mechanism is analyzed deeply, and the design process is elaborated. Final simulation results and test results show that the microstrip bandpass filter has transmission zero points on each side of a passband, which can effectively improve the frequency selectivity; a third transmission zero point is generated at a specified frequency position to enhance an out-of-band inhibiting capability, and the method has high performance, small size, easy design and the like.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a microstrip bandpass filter. Background technique [0002] The filter is one of the key components in radar, communication and measurement systems. Its function is to allow the signal of a certain frequency to pass smoothly, while allowing the signal of another part of the frequency to be greatly suppressed. Its performance is important to the performance of the entire system. Impact. The technical indicators of the filter include passband bandwidth, insertion loss, passband ripple, return loss, stopband rejection, in-band phase linearity, and group delay. According to the type of frequency response, it can be divided into elliptic filter, Butterworth filter, Gaussian filter, generalized Chebyshev filter and inverse generalized Chebyshev filter, etc. For analog filters, there are lumped parameter analog filters and distributed parameter analog filters. In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203H01P11/00
CPCH01P1/20354H01P11/007
Inventor 肖飞徐俊王余成亓孝博唐小宏
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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