Resonant frequency of dielectric ring resonator antenna

A dielectric resonator (DR) placed in an open environment radiates strongly at and around its resonant frequencies. Among the advantages of DR antennas are their small size and no conductor loss. The other features of DR antennas are that each mode has a unique radiation pattern and the frequency bandwidth over which the antenna radiates efficiently can be controlled by choosing an appropriate value of the dielectric constant of the DR or by choosing an appropriate DR geometry. A dielectric ring resonator antenna has a greater operating frequency bandwidth than a cylindrical dielectric resonator antenna. In this paper, we compute the resonant frequency of a dielectric ring resonator antenna. It is shown that the simple perturbational technique is sufficiently accurate for computing the resonant frequency of a ring resonator antenna.