Ka-band complete-polarization ultrathin frequency selective surface and antenna cover

Abstract

The invention provides a Ka-band complete-polarization ultrathin frequency selective surface. The Ka-band complete-polarization ultrathin frequency selective surface comprises a dielectric substrate and metal foil layers, wherein the metal foil layers are attached onto an upper surface and a lower surface of the substrate, the metal foil layers on the upper / lower surfaces comprises periodically-arranged upper / lower periodic micro unit structures, each unit structure is square and comprises three circular-annular gaps, four metal short-circuit gaps are loaded on an outer-side circular-annular gap and are uniformly arranged on a round ring, and the lower periodic micro unit structures are corresponding to the upper periodic micro unit structures. The invention also provides an antenna coverfabricated by employing the surface, and the antenna cover can be covered in a radiation direction of an antenna system. By the complete-polarization ultrathin frequency selective surface antenna cover, favorable rotation characteristic of the antenna within frequency bands of the Ka band being 33-37.5GHz can be maintained, free transceiving and communication can be achieved, meanwhile, good out-of-band rejection performance outside passband can be achieved, RCS of the antenna is reduced, and the purpose of hiding the antenna is achieved.

Description

technical field [0001] The invention belongs to the technical field of materials and radome, and in particular relates to a Ka-band fully polarized ultra-thin frequency selective surface and a radome. Background technique [0002] A frequency selective surface is an artificial periodic material. The electromagnetic properties of the original dielectric substrate are changed by designing the geometric shape of the metal foil coated on the surface of the dielectric substrate. By design, a frequency selective surface can transmit waves in certain frequency bands and reflect incoming waves in other frequency bands. Combining these frequency selective surfaces with the antenna can physically protect the antenna, act as a radome, improve the radiation performance of the antenna and reduce the radar cross section of the antenna to achieve stealth, etc.; it can also be made in the feed source The reflective surface that reflects electromagnetic waves in the working frequency band ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of the existing Ka-band frequency selective surface radome that it is difficult to achieve full polarization, poor out-of-band rejection, large thickness and heavy weight, etc., a fully polarized ultra-thin frequency selective surface radome with a thickness of only 0.5 mm is provided.

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