Abstract
An aperture-coupled CDRA is theoretically and experimentally investigated. The effects of: 1) the aperture size and 2) the air gap between the CDRA and the aperture on the resonant frequency, return loss, radiation pattern, directivity, unloaded Q-factor, and impedance bandwidth are numerically simulated. Based on the numerical results obtained, simple closed-form expressions are obtained enabling an antenna engineer to incorporate these effects into the design of an aperture-coupled CDRA. The predicted results were experimentally verified for several aperture sizes, and good agreement was obtained. Results showed that the feeding scheme and the fabrication imperfections have a significant effect on the performance of CDRAs. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 20: 407–414, 1999.
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