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Wide-stop-band LTCC band-pass filter based on frequency selectivity coupling technology

A frequency-selective, band-pass filter technology, used in waveguide-type devices, resonators, electrical components, etc., can solve the problems of large insertion loss and large size, and achieve the suppression of the third harmonic, compact structure, and good frequency selection. sexual effect

Active Publication Date: 2013-10-30
SOUTH CHINA UNIV OF TECH
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  • Abstract
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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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  • Wide-stop-band LTCC band-pass filter based on frequency selectivity coupling technology
  • Wide-stop-band LTCC band-pass filter based on frequency selectivity coupling technology
  • Wide-stop-band LTCC band-pass filter based on frequency selectivity coupling technology

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Embodiment Construction

[0025] In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the specific implementation of the present invention will be further described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto.

[0026] Such as figure 1 As shown, the embodiment of the present invention provides a wide stopband LTCC second-order bandpass filter based on frequency selective coupling technology. The entire filter is an LTCC multilayer structure consisting of four dielectric substrates and four conductor layers: The first conductor layer is located on the surface of the first dielectric substrate, the second conductor layer is located between the first dielectric substrate 1 and the second dielectric substrate 2, the third conductor layer is located between the second dielectric substrate 2 and the third dielectric substrate 3, and the second conductor layer is located be...

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Abstract

The invention discloses a wide-stop-band LTCC band-pass filter based on the frequency selectivity coupling technology. The wide-stop-band LTCC band-pass filter comprises two quarter-wave resonators, a metal floor and a pair of feeder line structures. The resonators and the feeder lines are distributed on four conductor layers. The feeder lines transmit energy to the resonators in a broadside-coupled mode, and the resonators transmit energy to each other in a side-coupled mode. According to the wide-stop-band LTCC band-pass filter based on the frequency selectivity coupling technology, the frequency selectivity coupling technology is achieved by selecting a proper coupling interval, and therefore third harmonics can be effectively restrained; meanwhile, weak coupling, namely, source-load coupling, is introduced between the two feeder lines, two transmission zeros are generated near a pass band, and therefore good frequency selectivity is achieved; besides, a transmission zero is also generated on a stop band, and therefore the restraint level of the stop band is enhanced. The wide-stop-band LTCC band-pass filter based on the frequency selectivity coupling technology has the advantages of being capable of restraining the third harmonics, high in selectivity, multiple in transmission zero and compact in structure.

Description

technical field [0001] The invention relates to an LTCC bandpass filter, in particular to a wide stopband LTCC bandpass filter based on frequency selective coupling technology. 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] There are many methods for existing filters to achieve stop-band suppression. The first method is to use the multipath transmission of electromagnetic signals. At a certain frequency point, the phases of electromagnetic fields transmitted by multipath are opposite, cancel each other, and generate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203H01P1/212H01P7/00
Inventor 章秀银代鑫张霓胡斌杰
Owner SOUTH CHINA UNIV OF TECH
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