Stepped impedance resonator based ultra-wide bandwidth filter with trapped wave adjustability

Abstract

The invention discloses a novel stepped impedance resonator based ultra-wide bandwidth filter with the trapped wave adjustability. The filter comprises a dielectric substrate (8), a metal micro-strip patch (9) and a metal grounding plate (7), wherein the metal micro-strip patch (9) is arranged at the upper part of the dielectric substrate (8); the metal grounding plate (7) is arranged at the lower part of the dielectric substrate (8); and the metal micro-strip patch comprises a loaded open-circuit uniform impedance resonant micro-strip line stub (5), an open-circuit stub (3) with three micro-strip lines arranged in the center and on two symmetric sides of a stepped impedance line respectively, and a switch (10) positioned between the open-circuit stub (5) and the open-circuit stub (3). The ultra-wide bandwidth filter with the trapped wave adjustability has the characteristics of compact structure, small size, easiness for machining, low manufacturing price and the like, and is relatively wide in application range.

Description

technical field [0001] The invention relates to ultra-wideband wireless technology, in particular to a compact ultra-wideband filter based on a step impedance resonator with adjustable notch characteristics. Background technique [0002] Now is an era of communication. With the vigorous development of wireless communication system and mobile phone technology, wireless communication closely links people's lives and affects people's lives. With the rapid increase in the number of users and the rapid development of wireless communication technology, the limited spectrum resources have begun to be exhausted. The specific manifestations are: the spectrum allocation of emerging communication services (such as TD-SCDMA) is tight, which makes the spectrum of each communication standard closer and closer; the interference, blocking and intermodulation between frequencies become more and more serious. Therefore, how to effectively utilize spectrum resources has become a very importan...

AI Technical Summary

Problems solved by technology

The traditional design method of multi-passband UWB filter is the cascading of multiple filters, which increases the system volume and design cost, and at the same time easily causes mismatch between components and reduces the efficiency of the system

[0004] In recent years, some new design ideas have appeared, such as defect ground structure, via structure or multi-layer LTCC structure. Although there has been some technological progress, it is lacking in key technical elements such as large-scale integration of the system and arbitrary adjustment of the stop band.

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