Abstract
A single-layer substrate integrated waveguide (SIW) monopolar ring-slot antenna is proposed in this letter. It is based on a combination of a circular ring-slot etched in the SIW top wall and a set of shorting vias placed concentrically between the area bounded by the ring and the SIW bottom wall. Thanks to this configuration, a monopole-like radiation pattern is obtained. The antenna is designed for the 5.8 ISM frequency band, parametrically studied and experimentally verified in free space and in the vicinity of a muscle-equivalent phantom. Experimental results prove that the antenna is very well matched in the 5.8 GHz ISM band, has good radiation performance and small sensitivity to the surrounding environment. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1865–1869, 2014
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