Abstract
To improve the bandwidth of a micro-strip antenna used in sensing moisture contents in materials, such as soil and concrete, a design method of circular double-layer micro-strip antenna is studied in this paper. The paper introduces the circular antenna structure, the algorithm for calculating resonant frequency, and the analysis of the relationship between patch size and bandwidth. Simulation results show that the proposed bandwidth of the micro-strip circular antenna (VSWR < = 2) is 525MHz (about 13% of the center frequency), 8.7 times as its single-layer counterpart (about 1.5%), and wider than its rectangular double-layer counterpart (about 9%). The antenna band is greatly improved by introducing a passive patch which meets working band requirements of the microwave moisture sensor. The numerical simulation results agree with the designed parameters.
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