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This study presents a circularly‐polarised substrate‐integrated waveguide (SIW) antenna implemented using a textile substrate and operating at 2.45 GHz, in the industrial, scientific, and medical frequency band. The antenna topology is based on a folded cavity with an annular ring as a radiating element, and it permits to obtain compact size and low sensitivity to the environment, without deteriorating the radiating performance. These characteristics, together with the choice of adopting a textile substrate, make the SIW antenna suitable for the integration in wearable systems for body‐centric applications. The electromagnetic performance of the proposed antenna achieved in simulations was verified through the measurement of the device in an anechoic chamber. The circularly‐polarised antenna exhibits a maximum gain of 6.5 dBi, a radiation efficiency of 73% and a very high front‐to‐back ratio.
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Moro et al. (2017) studied this question.
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