Bandwidth enhancement of five-port reflectometer-based ENG DSRR metamaterial for microwave imaging application


Md Hossain, Toufiq and Jamlos, Mohd Faizal and Jamlos, Mohd Aminudin and Dzaharudin, Fatimah and Al-Bawri, Samir Salem and Ismail, Muhammad Yusri and Sugumaran, Sathish and Ahmad Salimi, Midhat Nabil (2020) Bandwidth enhancement of five-port reflectometer-based ENG DSRR metamaterial for microwave imaging application. Sensors and Actuators, A: Physical, 303. pp. 1-8. ISSN 0924-4247

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A five-Port Reflectometer (FPR) with the integration of ultra-wideband (UWB) Epsilon Negative (ENG) Double Split Ring Resonator (DSRR) metamaterial array is introduced in this paper for microwave imaging (MWI) application. The designed DSRR consists of two concentric rings with a split in each which are spatially rotated by 180°, formed an inverted structure to exhibit a wide negative epsilon bandwidth of 187 % (from 0.5 GHz to 15 GHz). The FPR is designed using a ring junction topology and semi-circularly curved inter-port transmission lines (TLs) which are placed between five equally spaced ports. Localizing the DSRR metamaterial in a periodic array of 5 × 4 at the ground plane of FPR lead to 79.79 % fractional bandwidth and reflection coefficient within the operating frequencies of 0.991 GHz–2.2576 GHz. Equivalent circuit model has been alluded with an intricate description of different array configurations of the metamaterial unit cell. Comparison of EM simulation and circuit simulation has been performed to validate the equivalent circuit model. It is found that the existence of stray capacitance, which is represented by the DSRR configurations, significantly influenced the resonant frequency and bandwidth of FPR. Measured results of the proposed design suits well with the simulations and prove higher efficacious applicability of the proposed design for microwave imaging application. A comparison of the reconstructed image also proves its suitability for the microwave imaging application.

Item Type: Article
Uncontrolled Keywords: Microwave integrated circuits, Microwave imaging detection, Symmetric five-port reflectometer (FPR), Epsilon negative (ENG) metamaterial
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 21 Dec 2020 07:51
Last Modified: 21 Dec 2020 07:51


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