volume | PIER Journals

Abstract

In this paper, an antenna sensor based on an electromagnetic bandgap (EBG) structure is proposed to measure the complex permittivity of liquid under test (LUT). The sensor consists of two parts: a detection antenna and an EBG structure. The detection antenna uses a semicircular arc defective ground structure to improve the quality factor (Q-factor). Simultaneously, the EBG structure can be equivalent to a narrow-band bandpass filter, so that the electromagnetic wave can only propagate in a very narrow frequency band. It can further improve the Q-factor of the antenna and realize the precise positioning of the resonance frequency point. The complex permittivity of the LUT can be extracted by measuring the resonant frequency shift and the amount of variation in the Q-factor of the antenna. The test results show that the sensor can detect dielectric values covering the range of 1-25, and the average sensitivity is 2.342%. It combines the advantages of high sensitivity and wide detection range.

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Dr. Bo Yin

Dr. Juntao Yin