Broadband band-pass filter capable of loading three-branched coupling microstrip lines

Abstract

The invention provides a broadband band-pass filter capable of loading three-branched coupling microstrip lines. The broadband band-pass filter comprises two first microstrip lines, two second microstrip lines, two third microstrip lines, two fourth microstrip lines, two fifth microstrip lines, two sixth microstrip lines, two seventh microstrip lines and two signal transmission ends which are arranged on the surface of a dielectric plate, wherein the broadband band-pass filter is bilaterally symmetrical about a first central axis; the broadband band-pass filter is longitudinally symmetrical about a second central axis; the first central axis is the connecting line of middle points of an upper transverse frame and a lower transverse frame of the broadband band-pass filter; and the second central axis is the connecting line of middle points of an upper longitudinal frame and a lower longitudinal frame of the broadband band-pass filter. According to the broadband band-pass filter provided by the invention, high selectivity for band-pass signals can be realized, little noise is introduced, and interference for radio-frequency front end is avoided.

Description

technical field [0001] The invention relates to the technical field of microwave communication, in particular to a broadband bandpass filter loaded with three-twig coupled microstrip lines. Background technique [0002] As a very important device in the RF front-end, the filter can filter out out-of-band noise and improve the sensitivity of the circuit system. A microstrip filter is a device used to separate microwave signals of different frequencies. Its main function is to suppress unwanted signals so that they cannot pass through the filter and only allow the required signals to pass. In a microwave circuit system, the performance of the filter has a great influence on the performance index of the circuit system. Generally speaking, the selectivity performance of the filter to the passband signal is an important influencing index, but the selectivity of the existing filter to the passband signal is poor, which affects the performance of the entire communication system. ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a broadband bandpass filter loaded with three-twig coupled microstrip lines, aiming to solve the technical problem of poor passband signal selectivity in the prior art

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