Quasi-elliptic filtering character frequency selecting surface

A technology of frequency selective surface and filter characteristics, applied in the microwave field, can solve the problems of no ellipse or quasi-ellipse filter characteristics, inability to realize cross-coupling, large thickness of FSS structure, etc., achieve high selectivity and bandwidth stability, and save The time for design optimization and the effect of fewer structural parameters
CN1949587AInactive Publication Date: 2007-04-18SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2007-04-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention is a quasi-elliptic filter characteristic frequency selection surface, an ultrathin novel frequency selection surface with quasi-elliptic filter characteristic, based on substrate integrated waveguide cavity cascading technique, and the structure is made on a multilayer substrate formed by laminating three layers of microwave plates and having four metal surface layers and three medium layers, where the top and bottom metal surfaces are made with periodical square annular slots of the same size. And the intermediate metal surface is made with periodical square annualr slots of the other size which coincides the centers of the square annular slots on the top and bottom surfaces, three medium layers are filled in between the four metal surface layers, and a series of metalized through holes are arranged at regular intervals around each periodical square annular slot unit on the ready-laminated multilayer substrate so as to form a substrate integrated waveguide cavity equivalent to traditional metal cavity. As compared with common SMD or slot type multiscreen cascaded frequency selection surface, it first implements quasi-elliptic filter performance with high selectivity.
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Description

technical field

[0001] The invention is an ultra-thin novel frequency selective surface with quasi-elliptic filter characteristics based on the substrate integrated waveguide cavity cascading technology, and belongs to the field of microwave technology. Background technique

[0002] Frequency selective surfaces (FSS) are widely used in engineering applications. FSS has good selectivity for the transmission and reflection of electromagnetic waves. It has all-pass characteristics for electromagnetic waves in its passband, and total reflection characteristics for electromagnetic waves in its stopband. It has a spatial filtering function. In the microwave field, FSS can be used in the frequency band multiplexer of the communication satellite system, and the communication capacity can be expanded by using multi-feed configuration. Another main use is to make radomes for shielding and stealth of radar antennas in aerospace. High performance waveguide filters can also be fabricat...

Claims

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