Miniaturized broadband five-frequency-band band-pass filter

Abstract

The invention discloses a miniaturized broadband five-frequency-band band-pass filter. The filter comprises an upper-layer micro-strip structure, a middle-layer dielectric substrate and a lower-layer grounding metal plate, the upper-layer micro-strip structure is attached to the upper surface of the middle-layer dielectric substrate, and the lower-layer grounding metal plate is attached to the lower surface of the middle-layer dielectric substrate. The upper-layer microstrip structure is a five-frequency-band band-pass filter, the five-frequency-band band-pass filter comprises an input feeder line and an output feeder line which are arranged at the two ends, a square structure is arranged between the input feeder line and the output feeder line, a regular octagonal structure is arranged in the square structure, a+9nd two groups of gradually-changed stepped impedance resonators are symmetrically arranged in the regular octagonal structure by taking the diagonal line of the square structure as the center line. In order to improve the broadband, a pair of open-circuit branches are loaded at each of the eight vertexes of the regular octagonal structure, an open-circuit branch is loaded at the midpoint of each side of the square structure, and the open-circuit branches are connected with the input feeder line and the output feeder line at the two ends respectively, so that the broadband five-frequency band is realized.

Description

technical field [0001] The invention relates to the field of microwave and millimeter wave technology, in particular to a miniaturized broadband five-band bandpass filter. Background technique [0002] A microwave filter is a device used to separate microwave signals of different frequencies. Its main function is to suppress unwanted signals so that they cannot pass through the filter, and only allow the required signals to pass. Classification can be carried out according to function, component elements and transmission line structure: according to the function classification, there are low-pass filter, high-pass filter, band-pass filter and band-stop filter; according to the composition of the component classification, there are lumped parameter filter and distributed parameter filter And lumped parameter and distributed parameter hybrid filters. [0003] With the rapid development of wireless communication technology, frequency resources become more tense. At the same ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of miniaturized broadband five-band band-pass filter, to solve the problem of narrow multi-band coverage and narrow 3dB bandwidth in the prior art proposed in the above-mentioned background technology, which can only be aimed at a specific use environment The problem of being unable to meet the needs of various usage environments

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