Abstract
The sensitivity in a lower microwave band dielectric spectroscopic system is relatively less compared to that of millimeter wave and terahertz system. This work reports modeling and development of an epsilon-negative metamaterial resonator-inspired microwave band-stop filter as a prototype device and its detection circuitry for the spectroscopic analysis of dielectric samples in S-band. The device structure consists of a diamond-shaped patch with a complementary open split horn-ring resonator, fabricated on a Neltech substrate of relative permittivity (ε r = 3.2). The measured transmission coefficient at 2.2 GHz and simulated result at 2.24 GHz demonstrate an excellent accuracy in the device fabrication. A low-cost connector-type microwave signal detection system was assembled for the real-time transduction of device signal into an equivalent DC voltage. Further, a single channel cavity developed using polydimethylsiloxane was placed over the resonator gap for analyzing the perturbation effect of electric field intensity on the resonance and circuit output DC level for different dielectric samples under test. The performed calibrations show linearity up to 82.5 % in the device response.
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Acknowledgments
The authors thank Electronics Engineering Departments, Sardar Vallabhbhai National Institute of Technology, for providing the measurement facility. They also thank Department of Science and Technology (DST), India, for supporting this research under INSPIRE fellowship Ph.D. program.
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Kumari, R., Patel, P.N. A low-cost dielectric spectroscopic system using metamaterial open horn-ring resonator-inspired BSF and detection circuitry. Appl. Phys. A 122, 711 (2016). https://doi.org/10.1007/s00339-016-0238-x
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DOI: https://doi.org/10.1007/s00339-016-0238-x