Aperture-coupled cylindrical dielectric resonator antenna

An aperture-coupled CDRA is theoretically and experimentally investigated. The effects of : 1) the aperture size and 2) the air gap between the CDRA a nd the aperture on the resonant frequency, return loss, radiation pattern, directivity, unloaded Q-factor, and impedance bandwidth are numerically sim ulated. Based on the numerical results obtained, simple closed-form express ions are obtained enabling an antenna engineer to incorporate these effects into the design of an aperture-coupled CDRA. The predicted results were ex perimentally verified for several aperture sizes, and good agreement was ob tained. Results showed that the feeding scheme and the fabrication imperfec tions have a significant effect on the performance of CDRAs. (C) 1999 John Wiley & Sons, Inc.