Wideband filter adopting single-cavity five-mode cavity resonator

Abstract

The invention discloses a wideband filter adopting a single-cavity five-mode cavity resonator. The wideband filter comprises a cavity, a first port, a second port, a first perturbation metal body, a second perturbation metal body and a third perturbation metal body. The first perturbation metal body, the second perturbation metal body and the third perturbation metal body are arranged at the bottom of the interior of the cavity. The center of the first perturbation metal body, the center of the second perturbation metal body and the center of the perturbation metal body deviate from the center of the cavity. The first perturbation metal body and the second perturbation metal body are mutually symmetrical with the longitudinal center line of the cavity serving as the center. The center of the third perturbation metal body is located on the symmetric line of the first perturbation metal body and the second perturbation metal body. The first port and the second port are formed in the cavity and penetrate through the outer wall and the inner wall of the cavity. The wideband filter has the advantages of being high in selectivity, high in Q-value and easy to design and process; besides, the wideband filter has large fractional bandwidth and can well meet the requirement for miniaturized communication.

Description

technical field [0001] The invention relates to a filter with a cavity structure, in particular to a broadband filter using a single-cavity five-mode cavity resonator, and belongs to the field of wireless communication. Background technique [0002] In modern mobile communication technology, microwave radio frequency devices have become an indispensable and important part. As a basic radio frequency device, a filter has a series of indicators such as insertion loss, out-of-band rejection, and power capacity that have an important impact on the performance of the whole machine. The trend of system miniaturization and portability requires the filter unit to achieve the required performance indicators in a smaller space. [0003] In response to the above requirements, the waveguide cavity multimode filter has many advantages: first, high Q value; second, high power capacity; third, the waveguide cavity multimode filter can realize the single-mode requirement in one cavity The...

AI Technical Summary

Problems solved by technology

At the same time, we cannot ignore that there are many challenges in the development and manufacture of dielectric multimode filters, especially in the realization of large-scale production. The main problems are as follows: First, the complex parasitic coupling of high-order mode products has a great impact on the main mode , which greatly increases the complexity of simulation, especially debugging

It can be seen from the measurement results that the bandwidth of the filter is relatively narrow

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