Circuit model for microstrip array antenna with defected ground structures for mutual coupling reduction and beamforming applications

Ahmad, Khalid Subhi and Che Seman, Fauziahanim and Hamzah, Shipun Anuar and Goh, Chin Hock and Mohd Shah, Shaharil (2021) Circuit model for microstrip array antenna with defected ground structures for mutual coupling reduction and beamforming applications. International Journal of Integrated Engineering, 13 (1). pp. 101-119. ISSN 2229-838X

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Official URL: https://doi.org/10.30880/ijie.2021.13.01.010

Abstract

A microstrip array antenna (MAA) structure incorporated with an orthogonal I-shaped defected ground structure (OI-DGS) was proposed and investigated and its equivalent circuit was created. Reflection losses were simulated and verified with the proposed circuit model using CST Commercial and AWR Microwave Office software. The optimized S11 parameter of the model was obtained by tuning the dimensions of the microstrip patch elements in the MAA and the lengths and widths of the slots of defected ground structure (DGS). The proposed equivalent circuit is expected to be useful as a model for the DGS design and to study its behavior. Finally, two prototypes of MAA, without and with OI-DGS, were fabricated by the milling technology and tested. The simulated results showed that -5.53 dB mutual coupling reduction and the measured around -3 dB. The simulated results demonstrate that main beam shifted 43° while the measured main beam shifted 36°.

Item Type:	Article
Uncontrolled Keywords:	Array antenna; antenna radiation patterns; beamforming; defected ground structure; equivalent circuits; mutual coupling
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television
Depositing User:	Mr. Abdul Rahim Mat Radzuan
Date Deposited:	12 Apr 2022 06:38
Last Modified:	12 Apr 2022 06:38
URI:	http://eprints.uthm.edu.my/id/eprint/6900

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