Transmission Line Broadband Active Frequency Selective Surface

Abstract

A transmission line type broadband active frequency selective surface relates to the field of active frequency selective surfaces. In order to solve the problems of large loss, low transmittance of electromagnetic waves, narrow bandwidth in transmission state, poor polarization and oblique incidence stability, and complicated structure and large error of the existing coupled AFSS, a transmission line type broadband active frequency selective surface is provided. The transmission line type active frequency selective surface comprises a transmission line type active frequency selective surface and a transmission line type active frequency selective surface. The intermediate layer is a metal layer, and the air layer, the dielectric layer and the metal layer are distributed symmetrically fromthe intermediate layer to the two ends; The metal unit of the top metal layer comprises four isosceles trapezoidal metal sheets; Four isosceles trapezoidal metal sheets distributed vertically or horizontally, rotationally symmetrical about the center and with the upper bottom close to the center; The metal unit of the intermediate metal layer comprises four rectangular metal plates, wherein the composite center of the four rectangular metal plates is a square groove, and the four corners are notched grooves; The structure of the metal unit of the bottom metal layer is the same as that of the metal unit of the top metal layer. The invention has wide bandwidth, high transmittance and low loss, and is insensitive to polarization mode and oblique incidence angle.

Description

technical field [0001] The invention relates to the field of active frequency selective surfaces. Background technique [0002] Existing FSS research mostly focuses on traditional passive FSS, and has made a lot of progress in broadband and miniaturization. However, due to its non-tunability, once the design and processing are completed, the transmission characteristics cannot be changed. has certain limitations. For example, although the radome based on the existing passive FSS can realize the stealth outside the working frequency band of one's own side, in order to ensure the normal radiation of the internal antenna, the FSS must have transmission characteristics in the working frequency band of the internal antenna. When the working frequency band overlaps with one's own frequency band, the stealth function will be lost. [0003] Aiming at the shortcomings of fixed and untunable FSS performance, Active Frequency Selective Surface (AFSS) provides a solution. AFSS loads c...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of large loss of existing AFSS, low transmittance of electromagnetic waves, narrow bandwidth in transmission state, poor stability of polarization and oblique incidence, complex structure of existing coupled AFSS and large error, thus optimization long-period issues, thereby providing transmission-line-type broadband active frequency-selective surfaces

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