L-band micro-strip low-pass filter and radio frequency front-end transmitting system

Abstract

The invention discloses an L-band micro-strip low-pass filter and a radio frequency front-end transmitting system, and relates to the technical field of radio frequency microwaves. A metal micro-strip comprises a signal input end, a signal output end, a micro-strip stub line, a micro-strip long and thin line, a micro-strip short and thin line, a first micro-strip long and thin line, a second micro-strip long and thin line, a first micro-strip short and thin line, a second micro-strip short and thin line, the first micro-strip long and thin line and the second micro-strip long and thin line are arranged in a bilateral symmetry manner relative to the vertical central axis of the metal ground, and the micro-strip short and thin lines are also symmetrically arranged in the same manner; the micro-strip stub line is connected with the first micro-strip short and thin line and the second micro-strip short and thin line, one end of the first micro-strip long and thin line is connected with the signal input end, one end of the second micro-strip long and thin line is connected with the signal output end, and under the condition that the output power is large, an ordinary LC filter cannot bear large power, so that the micro-strip low-pass filter is improved; and on the basis, the size of the low-pass filter is reduced, so that the low-pass filter can be applied to more practical projects.

Description

technical field [0001] The invention relates to the field of radio frequency and microwave technology, in particular to an L-band microstrip low-pass filter and a radio frequency front-end transmitting system. Background technique [0002] In the field of filters, according to the operating frequency and the type of components used, filters can be divided into active and passive filters. In passive filters, it can be further divided into lumped parameter filters and distributed parameter filters. The main components of the lumped parameter filter are LC components and crystal resonators, and the main components of the distributed system filter are coaxial lines and microstrip transmission lines. Active filters are composed of cascaded amplifiers or other active devices. [0003] In the front-end part of the communication radio frequency, the filter plays an important role and is mainly used to selectively pass or suppress a specific frequency band. Usually, a low-pass or ...

AI Technical Summary

Problems solved by technology

Traditional LC filters cannot withstand excessive power, and microstrip line filters are too bulky

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