Plasma-Based Artificial Magnetic Conductor for Polarization Reconfigurable Dielectric Resonator Antenna
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Plasma-Based Artificial Magnetic Conductor for Polarization Reconfigurable Dielectric Resonator Antenna Hend Abd El-Azem Malhat 1
&
Saber Helmy Zainud-Deen 1,2
Received: 4 November 2019 / Accepted: 26 May 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Polarization reconfigurable dielectric resonator antenna (DRA) backed by plasma artificial magnetic conductor (AMC) ground plane is designed and optimized for 10-GHz applications. The AMC unit-cell consists of a metal cylinder with two pairs of cuts filled with a noble gas. According to the ionization degree of gas in the two pair of cuts, three polarization states are obtained. The AMC unit-cell operates at 10 GHz with ± 90° bandwidth of 26% and axial ratio (AR) bandwidth span from 9.3 to 10.25 GHz. A linearly polarized (LP) cylindrical DRA backed by 4 × 4 AMC ground plane is investigated. A wide impedance bandwidth of 20%, peak gain 7.8 dBi, and AR < 3 dB of 3.2% are achieved. A parametric study on the AMC unit-cell dimensions is presented. The DRA loaded with optimized AMC unit-cells broaden the AR bandwidth from 9.6 to 10.7 GHz (11%). A 13 × 13 unit-cell perforated dielectric reflectarray loading the DRA is used to increase the total gain. A peak gain of 19.5 dBi is achieved with reconfigurable polarization states. A sequential cooperate feeding network is used with 2 × 2 DRA backed by 8 × 8 AMC unitcells to improve the gain and CP bandwidth. Two chessboard square and triangle arrangements of AMC unit-cells are investigated. The square arrangement improves AR bandwidth to 2.4 GHz, gain to 13.3 dBi, and side lobe level (SLL) below the main beam to − 12.3 dB. Full-wave simulation is used to study and optimize the proposed structures. Keywords DRA . AMC . Plasma . Reflectarray and circular polarization
Introduction The rapid development in wireless communication systems increases the demands in designing wide band, high gain, circularly polarized (CP) antennas [1]. They present many advantages over conventional linearly polarized (LP) antennas such as resistance to the multipath interference, reduced Faraday’s rotation occurred from the ionosphere layer, and reduced losses due to receiver orientation [2]. CP antenna becomes a basic element in modern wireless systems such as wireless power transfer, radiofrequency identification (RFID), sensors, mobile, and satellite communications [2]. The design
* Hend Abd El-Azem Malhat [email protected] Saber Helmy Zainud-Deen [email protected] 1
Faculty of Electronic Engineering, Menoufia University, Menouf, Egypt
2
Faculty of Engineering and Technology, Badr University in Cairo (BUC), Badr, Egypt
of CP antenna involves the excitation of two orthogonal modes with equal power and quadrature phase shift, which can be achieved by one of two methods. The first one is based on shape deformation, edges truncation, orthogonal dual feed, or stub loading of the antenna radiator [3, 4]. The second method converts LP radiation to CP by loading the antenna with a polarization converter like m
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