Numerical investigation on compact multimode dielectric resonator antennas of very high permittivity

Two well known numerical techniques, the finite element method (FEM) and the finite integration in time domain (FIT), were applied to study a low volume high permittivity dielectric resonator antenna. The paper demonstrates that the design of a compact size and wide frequency coverage dielectric resonator antenna (DRA) for ISM band is possible by proper selection of the resonator shape in combination with appropriate resonant modes. Numerical results for one particular antenna design are reported.