Broadband filter with adjustable trapped wave

Abstract

The invention discloses a broadband filter with adjustable trapped wave. The broadband filter comprises a single-layer quarter-mode substrate integrated waveguide resonant cavity, wherein a signal metal layer is in the shape of an isosceles right triangle, a signal input microstrip line and a signal output microstrip line are arranged along the two right-angle sides of the signal metal layer respectively, a first gap is etched in the position, close to the signal input microstrip line, of the signal metal layer, a second gap is etched in the position, close to the signal output microstrip line, of the signal metal layer, a first adjustable device is arranged in the first gap, and a second adjustable device is arranged in the second gap. According to the invention, a variable capacitance diode is loaded in the port gap of the broadband filter, a bias voltage is loaded at two ends of the variable capacitance diode, a narrow stop band can be superposed on the basis of the original broadband of the broadband filter so as to introduce the trapped wave frequency, the continuous adjustment of the trapped wave frequency in a full-passband range can be realized by changing the capacitance value of the variable capacitance diode, and a PIN diode is utilized to play a role in adjusting the frequency, so that the self-adaptive capability of the broadband filter is enhanced.

Description

technical field [0001] The invention belongs to the technical field of filters, and in particular relates to a broadband filter with adjustable notch. Background technique [0002] After the U.S. Federal Communications Commission released the communication standard for the UWB frequency band in February 2002, UWB wireless communication technology has gained popularity because of its high data transmission rate, low loss, and good flexibility and mobility. a lot of attention in related fields. As a very important component in the system, the UWB filter will have a significant impact on the performance of the system. [0003] In increasingly complex broadband and ultra-wideband communications, certain noises inevitably exist in the wide passband, which interferes with the quality of broadband communications. Therefore, in broadband filters, it is often necessary to introduce a steep stop band at the noise frequency to suppress the noise. We usually call such a stop band a "n...

AI Technical Summary

Problems solved by technology

In terms of full tunability, due to the wide bandwidth, the adjustment effect of the center frequency is limited, and it is difficult to obtain a wide range of frequency changes. tune, but there is still the problem of narrow adjustment range of the notch, which cannot meet the requirements of flexible interference elimination in broadband systems, and the number of adjustment electrical components loaded is large, which not only increases the size of the filter and the difficulty of processing and welding, It also brings a large loss in the filtering process

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