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A circular polarized reflectarray antenna with electronically steerable beam and interchangeable polarizations

Published online by Cambridge University Press:  03 August 2020

Mohammad Fazaelifar*
Affiliation:
Department of Electrical and Electronic Engineering, Shiraz University of Technology, Modarres Blvd, 71555-313, Shiraz, Iran
Shahrokh Jam
Affiliation:
Department of Electrical and Electronic Engineering, Shiraz University of Technology, Modarres Blvd, 71555-313, Shiraz, Iran
Raheleh Basiri
Affiliation:
Department of Electrical and Electronic Engineering, Shiraz University of Technology, Modarres Blvd, 71555-313, Shiraz, Iran
*
Author for correspondence: M. Fazaelifar, E-mail: [email protected]

Abstract

The purpose of this paper is the design of a novel single layer reflectarray antenna in X-band, which can electronically steer the antenna beam and change its polarization. Each antenna element includes a circular patch and rings around it, equipped with two varactor diodes, which are positioned perpendicular together to create a circular polarization. First, using these elements, a circular polarized active electromagnetic band-gap (EBG) reflector is implemented. Then, a special feed is placed in a proper distance with respect to EBG reflector and a circular polarized reflectarray antenna is designed, which has capability of switching electronically between right- and left-handed circular polarizations. An electronic active board is designed and fabricated to provide the biasing voltages, control signals, and indicators. The elements of the reflectarray are designed and arranged in such a way that the varactor diodes can be biased independently. Consequently, a 3D beam is created, which can steer up to ±40o. For evaluating the antenna performance, the radiation patterns and the axial ratio of the antenna are determined at the operational frequency of 11.4 GHz. It is illustrated that, increasing the steering angle in θ direction decreases the directivity and the gain of the reflectarray antenna.

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

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