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High-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal

A two-dimensional photonic crystal and filter technology, applied in waveguide devices, electrical components, circuits, etc., can solve the problems of band-stop filter stop-band attenuation, quality factor difficult to meet high-performance requirements, etc., and achieve low insertion loss, The effect of small size and high quality factor

Inactive Publication Date: 2020-04-14
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For traditional band-stop filter design, stripline or waveguide structure is often used to realize, but no matter what kind of structure, the designed band-stop filter's stop-band attenuation, quality factor and other parameters are difficult to meet high performance requirements

Method used

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  • High-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal
  • High-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal
  • High-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal

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Experimental program
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Embodiment 1

[0028] After the radio frequency signal within a certain frequency range enters the filter from the input port 5 on the left, most of the electromagnetic waves input into the linear waveguide will be coupled only when the resonant frequency falls at the resonant frequency of the circular resonant cavity When the frequency of the electromagnetic wave input into the linear waveguide is different from the resonant frequency of the circular resonant cavity, the electromagnetic wave input into the linear waveguide passes through the resonant cavity and is output from the output port 6 of the output linear waveguide. When the distance between the AAH cavity and the main waveguide is L=600um, the resonant wavelength of the resonant cavity is 1668.3um, and all the energy is reflected back. The remaining wavelengths do not match the frequency of the resonant cavity and all pass through; thereby realizing the band-stop characteristic, so as to achieve the purpose of filtering out the int...

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Abstract

The invention discloses a high-Q-value radio frequency band elimination filter based on two-dimensional photonic crystal, which comprises a filter body, and the filter body adopts a lattice structure;wherein the filter body is provided with a horizontally arranged linear waveguide penetrating through the center of the filter body, one end of the linear waveguide is an input port of the band elimination filter, and the other end of the linear waveguide is an output port of the band elimination filter; wherein a resonant cavity and a plurality of rows of first circular dielectric cylinders arearranged on the filter body; the resonant cavity is arranged in the middle of one row of first circular dielectric cylinders; and the first circular dielectric cylinders in the resonant cavity are placed with a plurality of continuously arranged second-class circular dielectric cylinders meeting lattice mismatch constants, the distance between the first-class circular dielectric cylinders is a first lattice constant, and the distance between the second-class circular dielectric cylinders is a second lattice constant. The high-Q-value radio frequency band elimination filter has the advantages of small size, high quality factor and low insertion loss, and has important application value in the aspects of wireless communication technology and the like.

Description

technical field [0001] The invention relates to a high-Q radio frequency band-stop filter based on two-dimensional photonic crystals, belonging to the technical field of microwave photonic crystal filters. Background technique [0002] With the development of broadband and ultra-wideband communication systems, since band-stop filters can effectively suppress unwanted broadband signals, the research on high-performance radio frequency band-stop filters is very important. Band-stop filters are used in wireless communications, radar systems, testing In the microwave field, band-stop filters are often used to filter out interference components mixed in useful signals. Compared with band-pass filters, band-stop filters have the advantages of large power and low insertion loss. This advantage In addition to being used in places where narrow-band signals in specified frequency bands require high attenuation, it can also play a role in electromagnetic compatibility system testing an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
CPCH01P1/203H01P1/20309
Inventor 陈鹤鸣司阳
Owner NANJING UNIV OF POSTS & TELECOMM