A miniaturized broadband five-band bandpass filter

Abstract

The invention discloses a miniaturized broadband five-band bandpass filter, which comprises an upper layer microstrip structure, an intermediate layer dielectric substrate and a lower layer grounded metal plate, the upper layer microstrip structure is attached to the upper surface of the intermediate layer dielectric substrate, and the The lower ground metal plate is attached to the lower surface of the intermediate dielectric substrate, the upper microstrip structure is a five-band bandpass filter, and the five-band bandpass filter includes input feeders and output feeders at both ends, the A square structure is arranged between the input feeder and the output feeder, and a regular octagonal structure is arranged inside the square structure, and two groups of gradient steps are symmetrically arranged inside the regular octagonal structure along the diagonal line of the square structure as the center line. jump impedance resonator. In order to improve the broadband, the invention loads a pair of open-circuit stubs on the eight vertices of the regular octagonal structure, and loads an open-circuit stub on the midpoint of each side of the square structure, which are respectively connected to the input feeder and output feeder at both ends to realize broadband five-band.

Description

Technical field [0001] The present invention relates to the field of microwave millimeter wave technology, and is specifically a band pass filter for a small band. Background technique [0002] The microwave filter is a device used to separate different frequency microwave signals. Its main role is to suppress unwanted signals that cannot be passed through the filter, allowing only the required signals. Classification can be performed according to the function, constituent elements, and transmission line structure: classified by functional classification filter, high-pass filter, bandpass filter, and strip-resistant filter; classified by component classification with centralized parameter filter, distributed parameter filter And centralized parameters with distributed parameters mixed filters. [0003] With the rapid development of wireless communication technology, frequency resources become more tense. At the same time, the division of the frequency band is also finer. Among th...

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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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