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Bi-pass band frequency selective surface

A frequency-selective surface and dual-passband technology, applied in the microwave field, can solve the problems that the geometric structure cannot correspond to the clear physical meaning, cannot be quickly and effectively designed, and the selection characteristics are not good, so as to achieve easy and fast design and save time for design optimization , select the effect of performance improvement

Inactive Publication Date: 2007-03-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these implementation methods have different degrees of defects, such as poor selection characteristics, complex structures that are difficult to design, high manufacturing costs, or geometric structures that cannot correspond to clear physical meanings, so that rapid and effective design cannot be carried out.

Method used

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Embodiment Construction

[0020] The dual passband frequency selective surface of the present invention is fabricated by printed circuit board technology using a single layer microwave board. Its upper and lower surfaces are metal surfaces, and the middle of the metal surface is filled with medium. On the upper and lower metal surfaces, there are periodic double square annular gap units with exactly the same position, size and period length. Then on the substrate, a series of metallized through holes are arranged around each double square annular slot unit at uniform intervals to form a substrate-integrated waveguide cavity equivalent to a traditional metal cavity. The double square ring slits etched on the upper and lower metal surfaces are "back" shaped slits that are completely symmetrical about the two directions of length and width. When the X-Ku frequency band test frequency is 8-16GHz, the outer square annular gap on the upper and lower surfaces has a side length of 7.2mm and a width of 0.4mm, ...

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Abstract

Frequency selection surface with dual band pass can be utilized as frequency range multiplexer to apply to antenna in multiple frequencies in comm. system of satellite, radar etc. identical periodic outer square annular slot units and periodic inner square annular slot units are etched on up and low metal surfaces of base plate so as to form periodic dual square annular slot array in two layers. A series of metalized through holes with even interval surrounding each doublelayer square annular periodic slot unit are set up on laminated base plate so as to form integrated wave-guide cavity on base plate equivalent to traditional metal cavity. Comparing with frequency selection surface in dual frequency composed of periodic patches or slots in two different sizes, the new structure introduces cavity resonance mode, realizes unilateral drooping characteristic in dual frequency so as to raise selectivity characteristic greatly, and provides good stability for angle and polarizability.

Description

technical field [0001] The invention relates to a double-pass band frequency selective surface based on substrate integrated waveguide technology, which can be used as a frequency band multiplexer, 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 ...

Claims

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Application Information

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IPC IPC(8): H01P1/207H01P1/20
Inventor 洪伟罗国清蒯振起
Owner SOUTHEAST UNIV
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