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Design of a hybrid A-sandwich radome using a strongly coupled frequency selective surface element

Published online by Cambridge University Press:  10 February 2020

Krushna Kanth Varikuntla
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Tiruchirappalli, Trichy, India
Raghavan Singaravelu
Affiliation:
Department of Electronics and Communication Engineering, National Institute of Technology Tiruchirappalli, Trichy, India
Corresponding
E-mail address:

Abstract

The airborne radomes have to cater superior electromagnetic (EM) performance with bandpass characteristics of stealth application. In this regard, a hybrid A-sandwich radome is proposed in this paper. The proposed radome consists of a novel strongly coupled frequency selective surface (FSS) core sandwiched between two dielectric layers (acts as skin) to form an A-sandwich structure. The dielectric layers are cascaded in such a way that the middle layer has less dielectric parameters than the skin dielectric. The core layer comprises a modified FSS array using strongly coupled FSS layers through a series of metallic vias. This strongly-coupled FSS element will have the advantage of eliminating inter-element interference and improves the EM performance characteristics of the structure. The structure exhibits very good band-pass characteristics (>90%) at a normal impinging angle with sharp roll-off characteristics. To show the efficacy of the proposed structure, the transmission loss has been compared with that of conventional A-sandwich radomes at 0°, 50° incidence angle for both TE and TM polarization. Conformal analysis of the unit cell has been carried out, and sector-wise thickness optimization was performed to analyze the structure for the conformal shaped radome application. Finally, a physical prototype has been fabricated and measured its scattering parameters, radiation characteristics in a fully shielded anechoic chamber. The results are encouraging and prove its suitability for radome application.

Type
Antenna Design, Modeling and Measurements
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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