Chebyshev filtering character frequency selecting surface

A technology of frequency selective surface and filtering characteristics, applied in the microwave field, can solve the problems of limited use, large thickness of FSS structure, etc., and achieve the effect of stable performance, less structural parameters and low cost

Inactive Publication Date: 2010-05-12
SOUTHEAST UNIV
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Problems solved by technology

The cascaded multi-layer FSS is filled with a dielectric layer used as an impedance transformer, but the thickness of the dielectric layer is about a quarter of the wavelength corresponding to the center frequency of the working frequency band, which makes the thickness of the entire FSS structure very large, limiting it in many Use in practical applications

Method used

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  • Chebyshev filtering character frequency selecting surface
  • Chebyshev filtering character frequency selecting surface
  • Chebyshev filtering character frequency selecting surface

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Embodiment Construction

[0019] The ultra-thin Chebyshev filtering characteristic frequency selective surface is made by laminating two layers of microwave board with multi-layer printed circuit board process. Its upper and lower surfaces and the middle layer are metal surfaces, and the middle of the three layers of metal is composed of dielectric filling. On the upper and lower metal surfaces, there are periodic square annular gap units with the same position, size and period length, and the middle metal surface is engraved with periodic square annular gaps with different sizes from the upper and lower metal surfaces, but the center positions coincide and the period length is the same. gap unit. On the substrate made of three-layer metal surface and two-layer dielectric lamination, a series of metallized through holes are arranged around each square annular gap unit at uniform intervals, forming an upper and lower cascade equivalent to a traditional metal cavity. The substrate integrates a waveguide...

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Abstract

The invention is a Chebyshew filter characteristic frequency selection surface, able to act as frequency range multiplexer applied to multifrequency antennas of satellites, radars and other communication systems, characterized in pressing two layers of microwave plates into a multilayer substrate of the frequency selection surface, where the multilayer substrate comprises top and bottom metal surfaces and intermediate metal surface, where top and bottom medium layers are filled between the threee metal surfaces; besides, making large square annular slots of the same size on the top and bottommetal surfaces, and etching small square annular slots of the other size on the intermediate metal surface, which coincides with the centers of the large square annular slots; finally arranging a series of metalized through holes at regular intervals around each periodical square annular slot unit on the ready-laminated substrate and forming a substrate integrated waveguide cavity equivalent to traditional metal cavity. And the structure has stable pass band and selectivity for variation of angle and polarity of incident wave.

Description

technical field [0001] The invention is a novel ultra-thin frequency selective surface with Chebyshev filtering characteristics based on substrate integrated waveguide cavity cascading, 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 fabricated as monolithical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/207H01P1/20
Inventor 洪伟罗国清
Owner SOUTHEAST UNIV
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