Design, Fabrication and Non-destructive Microwave Measurement of a Quad Resonance, Mono-band Metamaterial Polarization C
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https://doi.org/10.1007/s11664-020-08571-3 Ó 2020 The Minerals, Metals & Materials Society
ORIGINAL RESEARCH ARTICLE
Design, Fabrication and Non-destructive Microwave Measurement of a Quad Resonance, Mono-band Metamaterial Polarization Converter Realized by a Fractal Inspired Split-Ring Resonator ARPIT SAHU,1 VARUN CHAUDHARY,1 RAVI YADAV,1 and RAVI PANWAR 1,2 1.—Indian Institute of Information Technology Design and Manufacturing Jabalpur, Madhya Pradesh, India. 2.—e-mail: [email protected]
Jabalpur,
The development and measurement of a single layer, wideband, and angularly stable microwave polarization converter (PC), specifically at a low-frequency regime, is still a very challenging task. In this article, a quad resonance, monoband metamaterial polarization converter is fabricated and measured using a non-destructive free-space microwave measurement setup. A comprehensive study of a single-layer metamaterial (MTM) structure using a miniaturized fractal element array reveals that four resonances can be achieved within its operating frequency band to realize a wide operating band. The proposed MTM-PC is inspired by the split-ring resonator (SRR) based fractal geometry to control the linearly polarized electromagnetic (EM) wave in the C-band. The result shows the average polarization conversion ratio over 87% in a single broad frequency band (i.e., 5.5 GHz to 8.0 GHz). A careful study reveals that wideband response at lower frequency is achieved by introducing four resonances due to fractal inspired SRR geometry. Moreover, the proposed structure is the oblique angle insensitive up to 45°. The results reflect the enormous potential of the proposed approach for various practical EM applications. Key words: Metamaterial, polarization converter, electromagnetics, non-destructive evaluation
INTRODUCTION Progressive development in wireless communication technology is observed in defense and commercial applications. Metamaterials (MTMs) have attracted the attention of researchers due to their exotic electromagnetic (EM) properties such as negative index refraction.1–3 Such advanced composite structures possess unique EM properties that are difficult to obtain in nature. MTM application includes clocking, polarization converters (PC),
(Received August 6, 2020; accepted October 16, 2020) Arpit Sahu and Varun Chaudhary have equal contributions in this work.
absorbers, electromagnetic interference (EMI) shielding, radar cross-section (RCS) reduction, radome, super-lensing, etc.1–10 The manipulation of EM polarization has been achieved by employing anisotropic MTM and chiral MTMs.5,6 The primary objective in several aspects, such as monochromatic RCS reduction, antennas, sensor systems, and optical communication, is to achieve identical response ideally for wide polarization angle of the incident EM wave.5–8 The conventional polarization converting techniques include liquid crystals, birefringence wave plates, and dichroic glasses.5–7 But, the thick substrate and narrow operating bandwidth (BW) of such devices limit
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