Multilayer wideband bandpass filter

Abstract

A multi-layer broadband bandpass filter applied in the field of communication disclosed by the present invention comprises a first metal formation layer, a first main circuit layer, a second main circuit layer, a second metal formation layer, an input / output electrode and a grounding layer arranged in sequence line, wherein the first main line layer includes a dielectric substrate and two input / output feeders and two coupling transmission lines symmetrically distributed on the upper surface of the dielectric substrate, and the second main line layer includes a dielectric substrate and a A T-shaped resonant structure composed of three transmission lines fixedly connected. The present invention forms a broadband bandpass filter through the interlayer coupling between the T-shaped resonant structure and the coupling transmission line and the input / output feeder, and due to the multipath effect of the interlayer signal propagation of the main line, four transmission channels can be generated near the passband of the filter. Zero point, the filter has high frequency selectivity and out-of-band rejection. At the same time, the multilayer broadband bandpass filter adopts a multilayer structure, which has high space utilization and small size.

Description

technical field [0001] The invention belongs to the technical field of microwave communication, and in particular relates to a multi-layer broadband band-pass filter with high frequency selection and high out-of-band suppression. Background technique [0002] With the rapid development of next-generation high-data-rate wireless communication systems, higher requirements are placed on high-performance, miniaturized broadband microwave bandpass filters. There are many ways to realize a wideband bandpass filter, and the more common ways are: (1) Use a low-pass filter and a high-pass filter in series structure, through which a wideband bandpass filter can be obtained, but its circuit structure is complex , Large size; (2) Multi-mode structure is adopted, but this structure is sensitive to changes in physical dimensions, and the design and processing technology are difficult. Contents of the invention [0003] The object of the present invention is to overcome the above-mentio...

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Problems solved by technology

There are many ways to realize a wideband bandpass filter, and the more common ways are: (1) Use a low-pass filter and a high-pass filter in series structure, through which a wideband bandpass filter can be obtained, but its circuit structure is complex , Large volume; (2) Multi-mode structure is adopted, but this structure is sensitive to changes in physical dimensions, and the design and processing technology are difficult

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