A set of hybrid microstrip patch and semi-circular cavity antennas is introduced. The semi-circular cavity is implemented using Half-mode Substrate Integrated Waveguide (HMSIW) technique. Different shapes of patch include rectangular, semi-circular and equilateral triangular are excited using proximity effect by the circular SIW cavity at its TM010 mode of operation. The whole structures have b...

A novel single-feed ultrawideband cavity-backed slotantenna with a reconfigurable polarization capability is demon-strated in substrate-independent air-filled substrate integratedwaveguide (AFSIW) technology for Internet-of-Things applica-tions the [5.15-5.85] GHz frequency band of unlicensednational information infrastructure. The antenna achieves an ul-trawide impedance bandwidth by exploitin...