Volume 30, Issue 12 e22462
RESEARCH ARTICLE

A simple electrically small microwave sensor based on complementary asymmetric single split resonator for dielectric characterization of solids and liquids

Anila P. Viswanathan

Corresponding Author

Anila P. Viswanathan

Centre for Research in Electromagnetics and Antenna, Department of Electronics, Cochin University of Science and Technology, Cochin, Kerala, India

Mar Athanasius College of Engineering, Kothamangalam, Cochin, Kerala, India

Correspondence

Anila P. Viswanathan, Centre for Research in Electromagnetics and Antenna, Department of Electronics, Cochin University of Science and Technology, Cochin 22, Kerala, India.

Email: [email protected]

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Remsha Moolat

Remsha Moolat

Centre for Research in Electromagnetics and Antenna, Department of Electronics, Cochin University of Science and Technology, Cochin, Kerala, India

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Manoj Mani

Manoj Mani

Centre for Research in Electromagnetics and Antenna, Department of Electronics, Cochin University of Science and Technology, Cochin, Kerala, India

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Shameena VA

Shameena VA

Centre for Research in Electromagnetics and Antenna, Department of Electronics, Cochin University of Science and Technology, Cochin, Kerala, India

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Mohanan Pezholil

Mohanan Pezholil

Centre for Research in Electromagnetics and Antenna, Department of Electronics, Cochin University of Science and Technology, Cochin, Kerala, India

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First published: 15 October 2020
Citations: 12

Abstract

The article presents an asymmetric single split resonator (ASSR) unit cell, its resonant properties, and an electrically small microwave sensor employing the complementary asymmetric single split resonator (CASSR) structure with high quality factor (Q) on the FR4 substrate. The structure is compared with the conventional symmetric split ring resonator. The CASSR sensor designed and fabricated on a substrate of dielectric constant 4.4 and a thickness 1.6 mm has an electrically small size of 0.127λ0 × 0.127λ0 × 0.007λ0 at 1.27 GHz, which yields ka = 0.56 < 1 with low radiation efficiency. The properties and performance of the proposed CASSR for extracting the permittivity of both solid and liquid samples using amplitude and phase sensing in a simple lab-in-touch approach are validated with full-wave simulations and experimental results.

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