Reconfigurable Full-Metal Circularly-Polarized Cavity-Backed Slot Antenna and Array With Frequency and Polarization Agility. - Rui-Sen Chen; Xiao-Dong Li; Hao-Lei Liu; Guan-Long Huang; Sai-Wai Wong; Mustafa K. Taher Al-Nuaimi; Kam-Weng Tam; Wai-Wa Choi (IEEE Trans. Circuits Syst. II Express Briefs, 2023)