Microwave Sensor with Hairpin Resonator-Based Line and Defected Ground Structure

Bruno Matias de Sousa, Valdemir Praxedes da Silva Neto, José Patrocínio da Silva

DOI: 10.14209/sbrt.2025.1571143578

Evento: XLIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2025)

Keywords: Microwave sensor Hairpin topology Thue-Morse sequence

Abstract

This article proposes a Defect Ground Structure (DGS) based on the Thue-Morse sequence with a Hairpin-Based sensor optimized for S-band applications. The microwave sensor operates within a frequency range of 2.27 to 2.42 GHz and is constructed on a printed circuit board with a copper foil and FR-4 substrate, with a permittivity of 4.4 and a loss tangent of 0.02. The measured bandwidth was around 160 MHz and the transmission coefficient was -25 dB, with an average sensitivity measurement of 0.76% on the sensor. Despite a minor discrepancy observed in the return loss response value between the measured and simulated values, the proposed sensor is applicable to frequencies within the 2 to 4 GHz S-band.

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