Radiation Suppression Index of Filtering Antennas

This paper presents a new performance metric of filtering antennas known as radiation suppression index (RSI). Researchers often use the term “high selectivity” when reporting filtering antenna designs, however, it is a descriptive term. High selectivity cannot quantify the radiation roll-off and thus, no comparison can be made with other designs. A metric of RSI based on radiation efficiency is proposed here through a design of dual-polarized filtering magnetoelectric dipole antenna. The purpose is to promote a measurement standard for RSI in such a way that the radiation roll-off rates can be (i) gauged, and (ii) compared between filtering antennas.