ltcc bandpass filter using feed structure to suppress the third harmonic

A band-pass filter, sub-harmonic technology, applied in the direction of waveguide devices, circuits, electrical components, etc., can solve the problems of large insertion loss, complex structure, large size, etc., to achieve reduced volume, good selectivity, and structure. compact effect

Active Publication Date: 2017-01-11
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing stop-band suppression filters all have relatively complex structures, or have problems such as large size and large insertion loss.

Method used

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  • ltcc bandpass filter using feed structure to suppress the third harmonic
  • ltcc bandpass filter using feed structure to suppress the third harmonic
  • ltcc bandpass filter using feed structure to suppress the third harmonic

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Embodiment Construction

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for the description of the embodiments. The drawings in the following description are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

[0028] Such as figure 1 As shown, the LTCC bandpass filter that uses a feed structure to suppress the third harmonic is characterized in that the entire filter is an LTCC multilayer structure, consisting of thirteen layers of dielectric substrates, nine layers of conductor layers, and twelve through holes; The thirteen-layer dielectric substrates are LTCC ceramic dielectric substrates, which are stacked sequentially from bottom to top, and are respectively the first to thirteenth dielectric substrates; the nine conductor layers all use conductor copper as raw material, a...

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Abstract

The invention discloses an LTCC bandpass filter which adopts a feeding structure to suppress the third harmonic, including two quarter-wavelength resonators, two feeding patches and a floor, which are respectively distributed on nine conductor layers, Connected through metal vias; layers 1, 3, 6, and 9 are the floor, layers 2, 4, 5, and 7 are the layers where the quarter-wavelength resonators are located, and layer 8 is the layer where the feed patch is located ; By adjusting the distance between the eighth conductor layer and the ninth conductor layer, the impedance characteristics of the feed patch can be changed, thereby changing the coupling between the feed patch and the resonator; changing the length of the feed patch can also change The coupling between the feed patch and the resonator; adjusting the coupling of these two parts can make the feed patch and the resonator mismatch, thereby suppressing the third harmonic part of the filter characteristic of the resonator, and achieving the purpose of wide stopband; the present invention The adopted LTCC process contains a multi-layer structure, reduces the size of the filter, and has novelty, creativity and practicability.

Description

technical field [0001] The invention relates to a band-pass filter applicable to a radio frequency front-end circuit, in particular to an LTCC band-pass filter which adopts a feeding structure to suppress harmonics. Background technique [0002] With the rapid development of the information industry, various communication systems continue to emerge, the rapid development of wireless communication technology and the increasingly tense global communication frequency bands put forward stricter requirements for microwave filters. Modern filters require high performance, small size, wide stop band, and low cost. Among them, small size and wide stopband are important indicators of single passband filter performance. [0003] Most of the existing filters to achieve stop-band suppression are achieved by introducing transmission zeros in the stop-band. There are many ways to generate transmission zeros. The first method is to use the multi-path transmission of electromagnetic signal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/212
Inventor 章秀银徐金旭赵小兰
Owner SOUTH CHINA UNIV OF TECH
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