Miniaturized T-shaped dual-mode resonator

Abstract

A miniaturized T-shaped dual-mode resonator disclosed by the invention is compact in structure, small in size and low in return loss. According to the technical scheme, a microstrip layer is provided with a strip-shaped microstrip transmission line extending in the length direction of a dielectric layer substrate, an inverted-L-shaped branch microstrip transmission line perpendicular to the strip-shaped microstrip transmission line, and an inverted-L-shaped branch microstrip transmission line inserted into the inverted-L-shaped branch microstrip transmission line to form a Z-shaped step gap groove. After the inverted-L-shaped branch microstrip transmission line and the L-shaped branch microstrip transmission line are coupled, a T-shaped branch is formed on the strip-shaped microstrip transmission line, and the top end of the inverted-L-shaped branch microstrip transmission line is connected with a bottom metal plate through a feed column microstrip plate to form a short-circuit T branch. The inverted-L-shaped branch microstrip transmission line is coupled with the 7 mirror-symmetrically shaped branch microstrip transmission line through the Z-shaped step gap groove and is equivalent to a coupling series capacitor of the T-shaped branch. Thus, the dual-mode resonator in which the 7 mirror-symmetrically shaped branch microstrip transmission line and the inverted-L-shaped branch microstrip transmission line are coupled is formed.

Description

Technical field [0001] The present invention is in the microwave / millimeter wave field, particularly relates to a resonator filter design is mainly used in compact dual-mode resonator T. Background technique [0002] In designing a filter, a double (multiple) mode resonator used as a double (multiple) mode tuning circuit can reduce the number of resonators, transmission zero increases. Microwave dual-band filters are key components in a communication system, which directly affect the merits of the performance indicators of the quality of the entire communication system. Filter press is divided into a transmission line in the form: microstrip, coaxial and waveguide type three. The basic configuration similar to the filter three structures are connected by the transmission line and the main transmission line of the main line composed of a plurality of resonators. Microstrip transmission line belonging to a plane type structure, a circuit can be formed flexibly, while having a sma...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor out-of-band rejection and large size of the traditional hybrid coupling bandpass filter, the present invention aims at the problems and shortcomings of the above-mentioned technologies, and proposes a compact structure, small volume, low return loss, and relatively Miniaturized T-shaped dual-mode resonator with wide upper frequency band and stop-band effect to overcome the problems of excessive size and poor out-of-band suppression of traditional dual-mode resonators

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