Broadband filter used for multimode cavity resonator and based on coaxial feed probe perturbation

Abstract

The invention discloses a broadband filter used for a multimode cavity resonator and based on coaxial feed probe perturbation. The broadband filter comprises a cavity, a first port and a second port; the first port and the second port are formed in the bottom of the cavity and penetrate through the outer wall and the inner wall of the bottom of the cavity; the first port is provided with a first coaxial inner conductor and a first coaxial outer conductor, the second port is provided with a second coaxial inner conductor and a second coaxial outer conductor, the first coaxial inner conductor and the first coaxial outer conductor are welded and stretch into the cavity from the first port to form a feed probe, the second coaxial inner conductor and the second coaxial outer conductor are welded and stretch into the cavity from the second port to form a feed probe, the first port and the second port are in central symmetry with respect to the original point of the center of the bottom of the cavity, the first coaxial inner conductor and the second coaxial inner conductor are in central symmetry with respect to the original point of the center of the bottom of the cavity, and the first coaxial outer conductor and the second coaxial outer conductor are in central symmetry with respect to the original point of the center of the bottom of the cavity. The broadband filter has a large fractional bandwidth and can meet requirements of a communication system.

Description

technical field [0001] The invention relates to a filter with a cavity structure, in particular to a broadband filter based on a coaxial feeding probe perturbation multi-mode cavity resonator, which belongs to the field of wireless communication. Background technique [0002] With the development of wireless communication systems, it is more and more urgent to utilize other restricted frequency bands. In order to make more effective use of these frequency resources, the filter in the microwave communication system is an indispensable electronic device, and its performance directly affects the quality of the communication system. As communication technology is updated day by day, higher requirements are placed on the performance of filters. For example: small size, lower insertion loss, high selectivity, etc. Or have special requirements for bandwidth. As for the cavity filter, it is widely used because of its low insertion loss and high power resistance, but it cannot be ...

AI Technical Summary

Problems solved by technology

For the current technology, most of the practical dielectric multimode filters are miniaturized, but it is undeniable that there are many challenges in the development and manufacture of dielectric multimode filters, especially in the realization of large-scale production, mainly the following problems: one , 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

The structure of this coupling method is not easy to process, and it can achieve relatively narrow bandwidth

Images