Perforated Medium Applied in Frequency Selective Surfaces and Curved Antenna Radome

A perforated medium (PM) combined with an ultra-wideband frequency selective surface (FSS) is proposed for the antenna radome design, which provides more flexibility in the radome materials selection and processing. The dielectric constant performance of the PM can be improved by perforating air holes through the medium, thus the restrictions of the FSS medium material parameters can be released. A multiscale homogenization method is utilized to calculate the dielectric constant of this PM, and the transmission coefficients of the planar FSS structure at different incidence angles are computed. The PM FSS is then applied in the curved antenna radome. The physical optic method serves to analyze the transmission performance of the curved antenna radome. In order to reduce the computational difficulties and meet the requirements of physical optic computing, the transmission coefficients are obtained as a function of the frequency by the vector fitting method, and the incidence angle dependence is deduced by B spline interpolation. The simulated and experimental radiation patterns with and without the radome are compared and the results show good agreement.

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Ultra-wideband and low-loss linear-to-circular polarizer based on multilayer frequency selective surface

Applied Physics A ◽

10.1007/s00339-020-04263-1 ◽

2021 ◽

Vol 127 (2) ◽

Author(s):

Ping Wang ◽

Yu Wang ◽

Yanwen Hu ◽

Hongcheng Zhou ◽

Zhongming Yan ◽

...

Keyword(s):

Frequency Selective Surface ◽

Ultra Wideband ◽

Low Loss ◽

Circular Polarizer ◽

Frequency Selective

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Design and implementation of 2.5D frequency-selective surface based on substrate-integrated waveguide technology

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078718001678 ◽

2019 ◽

Vol 11 (3) ◽

pp. 255-267 ◽

Cited By ~ 4

Author(s):

Krushna Kanth Varikuntla ◽

Raghavan Singaravelu

Keyword(s):

Incidence Angle ◽

Equivalent Circuit Model ◽

Frequency Selective Surface ◽

Dielectric Substrate ◽

Angular Stability ◽

Substrate Integrated Waveguide ◽

Patch Type ◽

Angular Performance ◽

Final Design ◽

Frequency Selective

AbstractIn this paper, the patch-type frequency selective surfaces (FSS) based on substrate-integrated waveguide (SIW) technology is proposed to improve the bandwidth (BW) and angular performance. The proposed FSS configuration overcomes the limitations of both conventional 2D and 3D FSS structures. A closely coupled cascaded mechanism is employed to combine two identical FSS elements separated by thin dielectric substrate results in incorporation of SIW technology; hence, named as 2.5D FSS. A derived equivalent circuit model is used to estimate the basic performance of proposed FSS–SIW elements, and the response of analytical expressions has been validated and final design is obtained using full-wave simulations. Two basic FSS elements viz. single square loop and a Jerusalem cross have been investigated to prove the enhancement in their BW and angular stability. The proposed technique evidently improves the BW and angular stability of FSS structures than in its established form. Besides, various important parameters that influence the performance characteristics of reported 2.5D FSSs are also studied. The important observations made on the thickness, as the thickness increases the bandstop FSS, can change to bandpass FSS. Finally, the proposed FSS structure has been fabricated and measured using free space measurement setup, to show the effectiveness of theoretical results. The measured results show good agreement with simulated results at normal and oblique incidence angle.

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