High stability single-port dual band microwave sensor based on interdigital capacitor structure with asymmetry branch feedline

Syah, Alam and Surjati, Indra and Sari, Lydia and Mardian, Raden Deiny and Firmansyah, Teguh and Iqbal, Muhammad and Widodo, Slamet and Alaydrus, Mudrik and Zakaria, Zahriladha (2025) High stability single-port dual band microwave sensor based on interdigital capacitor structure with asymmetry branch feedline. IEEE Access, 13. pp. 24576-24586. ISSN 2169-3536

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Abstract

This paper proposes a single-port interdigital capacitor (IDC) resonator based on asymmetric branch feed line with high stability performance for permittivity detection of solid materials with a permittivity range of 1 - 6.15. The microwave sensor is designed using a single-port resonator operating at two different resonant frequencies fr1 = 1.61 GHz and fr2 = 2.52 GHz. Dual band frequency was proposed using asymmetric branch feed line. In addition, to confine the electric field concentration of the resonator, an interdigital capacitor (IDC) structure is proposed as a solution. Furthermore, a copper shield was proposed as conducting material to evaluate performance stability of the sensor from disturbance effect with range of d = 1 cm – 2.5 cm. Based on the measurement results, the sensor has high stability both without and with disturbance with an a Frequency Detection Resolution (FDR) of 0.009 - 0.4 GHz/1εr, a Normalized Sensitivity (NS) of 0.4% - 4.4%, and an average accuracy of 90% - 95% for both resonance frequencies, respectively. Therefore, this sensor can be recommended for several applications such as biomedical industry, pharmaceuticals and material quality control especially for outdoor measurements that are potentially affected by electromagnetic interference and disturbance.

Item Type:	Article
Uncontrolled Keywords:	Dual-band, High stability, Interdigital capacitor, Microwave sensor, Single-port resonator
Divisions:	Faculty Of Electronics And Computer Technology And Engineering
Depositing User:	Norfaradilla Idayu Ab. Ghafar
Date Deposited:	18 May 2026 01:30
Last Modified:	18 May 2026 01:30
URI:	http://eprints.utem.edu.my/id/eprint/29896
Statistic Details:	View Download Statistic

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