Reconfigurable Differential Bandpass Filter Based on Coupled Cross Resonators

Abstract

The invention discloses a coupled cross resonator based reconfigurable differential band-pass filter which comprises two mutually-coupled micro-strip cross resonators. The mutually-coupled micro-strip cross resonators are bilaterally symmetrical relative to the longitudinal neutral axis of the filter, and each micro-strip cross resonator is formed by combining three micro-strip transmission lines. The coupled cross resonator based reconfigurable differential band-pass filter is of a simple and easily-achieved micro-strip transmission line structure and is light in weight, small in size, high in processing speed and low in cost, differential-mode filtering center frequency, differential-mode filtering response band width, differential-mode filtering selection characteristic, common-mode rejection range and common-mode rejection capacity of the filter can be very conveniently reconfigured by welding lumped capacitors different in capacitance value so as to meet the requirements for communication devices of different systems and different environments. The coupled cross resonator based reconfigurable differential band-pass filter has wide research and development prospect on design of frequency modulation communication devices, communication devices in complicated environments and civil or military communication devices having high common-mode noise suppression requirements.

Description

technical field [0001] The invention belongs to the field of reconfigurable microwave passive filters in the field of microwave and millimeter waves, in particular to a reconfigurable differential bandpass filter based on a coupled cross-shaped resonator. Background technique [0002] Severe noise interference is one of the factors that affect electronic equipment and make it difficult to perform optimally, and may even make the entire equipment not work properly. In order to solve this kind of problem, many experts and scholars have made great efforts, and finally focused on the filter to solve this problem. Filters are one of the most important and essential devices in communication equipment. Traditional bandpass filters are generally single-ended, that is, there is only one signal input port and one signal output port, and they can only selectively filter signals of different frequencies, and it is difficult to suppress common-mode noise. The new differential band-pass...

AI Technical Summary

Problems solved by technology

Based on the above analysis, the present invention proposes a novel reconfigurable differential band based on coupled cross-shaped resonators, which has excellent differential-mode filtering characteristics and common-mode rejection capabilities, and has reconfigurable differential-mode and common-mode responses. pass filter, and no related studies and reports have been found

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