Hybrid half-mode SIW cavity-backed diplex antenna for on-body transceiver applications

Hybrid half-mode substrate integrated waveguide (HMSIW) diplex antenna is proposed for on-body transceiver applications. The antenna comprises of two quarter-mode SIW cavities specifically a circular cavity and a rectangular cavity. Both resonators are excited individually with dedicated microstrip lines to yield two distinct resonant frequencies at 4 GHz and 4.79 GHz. High isolation (> 25 dB) between the two resonator cavities is ensured by etching a rectangular slot at the cavity junction. The proposed antenna is also simulated near a human head model and a body voxel model and validated for acceptable specific absorption rate (SAR) values for the antenna to be used for on-body transceiver applications. The radiation from the antenna is mostly unidirectional, thus contributing to low SAR values.

Automated summary

The proposed Hybrid half-mode substrate integrated waveguide (HMSIW) diplex antenna utilizes two quarter-mode SIW cavities, each excited at different resonant frequencies, with high isolation between them to ensure low SAR values near human bodies. The antenna's mostly unidirectional radiation contributes to its low SAR values, making it suitable for on-body transceiver applications.