Wide-stopband LTCC (low temperature co-fired ceramic) band-pass filter based on magnetoelectric coupling counteraction technology

Abstract

The invention discloses a wide-stopband LTCC (low temperature co-fired ceramic) band-pass filter based on a magnetoelectric coupling counteraction technology. The wide-stopband LTCC band-pass filter based on the magnetoelectric coupling counteraction technology comprises two quarter-wave resonators, a metal floor and a pair of feed structures, wherein the resonators and feed patches are distributed on four conductor layers; the first layer is a feed layer with large feed patches and CPW (coplanar waveguide) feed ports; the two quarter-wave resonators are distributed at the second layer and the fourth layer, and the third layer is a grounding layer; the feed patches transmit energy to the resonators by means of broadside coupling; the resonators transmit energy to each other via side coupling, magnetic coupling and electric coupling exist between the two resonators simultaneously, the coupling in intervals close to a grounding end mainly is the magnetic coupling, and the coupling in intervals close to the open-circuit ends of the resonators mainly is the electric coupling; and the position of the transmission zero point of the filter can be conveniently adjusted by adjusting the intensities of the magnetic coupling and the electric coupling. The wide-stopband LTCC band-pass filter based on the magnetoelectric coupling counteraction technology disclosed by the invention is provided with a plurality of transmission zero points, as well as is excellent in selectivity and stopband suppression performance, and compact in structure.

Description

Technical field [0001] The invention relates to a wide stopband bandpass filter based on LTCC technology, and in particular to a bandpass filter that uses magneto-electric hybrid coupling to generate multiple transmission zero points and can be applied to bandpass filters in radio frequency front-end circuits. 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 tight global communication frequency bands have put forward more stringent requirements for microwave filters. Modern filters require features such as high performance, small size, wide stopband, 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 stopband suppression. The first method is to use multipath transmission of electr...

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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.

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