| Abstract: | Probe‐fed cylindrical dielectric resonator antennas (CDRAs), with dielectric constant ϵr=37 and supported by an infinite ground plane, are simulated using the finite element method. From this, closed form expressions are obtained for the resonant frequency, directivity, and unloaded Q‐factor, applicable to a wide range of antenna dimensions. The effects of (a) the finite circular ground plane, (b) the air gap between the CDRA and the ground plane, (c) the air gap between the CDRA and the feed probe, and (d) the length of the probe on these parameters are studied for a particular CDRA and appropriate correction factors are derived. The simulated results are compared with those obtained experimentally for various ground planes, probe lengths, and probe spacings. The closed form expressions provide good agreement with the experiments in resonant frequency, unloaded Q‐factor, and impedance bandwidth, but less accurate prediction in antenna directivity for the specified range of parameters. ©1999 John Wiley & Sons, Inc. Int J RF and Microwave CAE 9: 2–13, 1999 |
