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LTCC band-pass filter using feed structure to restrain third harmonics

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

Active Publication Date: 2014-07-09
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 band-pass filter using feed structure to restrain third harmonics
  • LTCC band-pass filter using feed structure to restrain third harmonics
  • LTCC band-pass filter using feed structure to restrain third harmonics

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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 materia...

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Abstract

The invention discloses an LTCC band-pass filter using a feed structure to restrain third harmonics. The LTCC band-pass filter using the feed structure to restrain third harmonics comprises two quarter-wavelength resonators, two feed patches and floors which are respectively distributed on nine conductor layers and connected through metal through holes, wherein the floors are located on the first, third, sixth and ninth conductor layers, the quarter-wavelength resonators are located on the second, fourth, fifth and seventh conductor layers, the feed patches are located on the eighth layer, the impedance characteristic of the feed patches can be changed by adjusting the distance between the eighth conductor layer and the ninth conductor layer, and therefore coupling of the feed patches and the resonators is changed. The coupling of the feed patches and the resonators can also be changed by changing the length of the feed patches, the feed patches are made to be mismatched with the resonators by adjusting the coupling of the two parts, and therefore the third harmonic part of the filter characteristics of the resonators is restrained, and the purpose of a wide stop band is achieved. The LTCC process adopted by the LTCC band-pass filter using the feed structure to restrain third harmonics comprises a multi-layer structure, the size of the filter is reduced, and the LTCC band-pass filter has novelty, creativeness 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 sign...

Claims

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Application Information

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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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