The impedance bandwidth of a high permittivity cylindrical dielectric resonator antenna excited by a microstrip line was significantly improved by modifying the feed geometry. The 10 dB return loss bandwidth is enhanced from 12 to 26% without much affecting the gain and other radiation properties of the antenna. Good agreement has been observed between the predicted and measured results.
P. V. Bijumon, Menon, S. K., Suma, M. N., Sebastian, M. T., and Mohanan, P., “Broadband cylindrical dielectric resonator antenna excited by modified microstrip line”, Electronics Letters, vol. 41, pp. 385–387, 2005.