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Slot-Loaded Microstrip Patch Sensor Antenna for High-Sensitivity Permittivity Characterization

School of Computer and Communication Engineering, Daegu University, 201 Daegudae-ro, Gyeongsan, Gyeongbuk 38453, Korea
Department of Electronics Engineering, Dongseo University, 47 Jurye-ro, Sasang-gu, Busan 47011, Korea
Author to whom correspondence should be addressed.
Electronics 2019, 8(5), 502;
Received: 2 April 2019 / Revised: 29 April 2019 / Accepted: 30 April 2019 / Published: 7 May 2019
(This article belongs to the Special Issue Intelligent Antennas)
PDF [7170 KB, uploaded 7 May 2019]


A slot-loaded microstrip patch sensor antenna is proposed to enhance sensitivity in measuring the permittivity of planar materials. A thin rectangular slot was etched along the radiating edge of a rectangular patch antenna fed by a microstrip transmission line. Two resonant frequencies were created at a lower frequency compared to the single resonant frequency of a conventional ordinary patch antenna. The sensitivity of the proposed slot-loaded patch antenna was measured by the shift in the resonant frequency of the input reflection coefficient when the planar dielectric superstrate was placed above the patch, and was compared with that of a conventional patch antenna without the slot. The two antennas were designed and fabricated on a 0.76 mm-thick RF-35 substrate for the first resonant frequency to resonate at 2.5 GHz under unloaded conditions. Five different standard dielectric samples with dielectric constants ranging from 2.17 to 10.2 were tested for sensitivity comparison. The experiment results showed that the measured sensitivity of the proposed patch antenna were 3.54 to 4.53 times higher, compared to a conventional patch antenna, for the five samples. View Full-Text
Keywords: Slot-loaded microstrip patch sensor; high-sensitivity; radiating edge; permittivity characterization Slot-loaded microstrip patch sensor; high-sensitivity; radiating edge; permittivity characterization

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Yeo, J.; Lee, J.-I. Slot-Loaded Microstrip Patch Sensor Antenna for High-Sensitivity Permittivity Characterization. Electronics 2019, 8, 502.

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