Frequency Of Dielectric Resonator Antenna Research Articles

Analytical Computation of Resonant Frequency of Rectangular Dielectric Resonator Antenna By Including Effective Dimensions of DRA

In this paper, a new concept of effective dimensions of rectangular dielectric resonator antenna (DRA) is introduced to calculate the resonant frequency of rectangular DRA accurately. Mathematical modeling for computation of resonant frequency is developed using transcendental equation and appropriate boundary conditions of rectangular dielectric resonator antenna. Difference between effective and actual physical dimensions are analysed for different modes in details. Important parameters that control the effective dimensions, that is, physical dimensions, orientation, and dielectric constant of DRA, have been studied. E-fields inside the rectangular DRA have also been studied for different frequencies. Simulations and experimental measurements were carried out to verify the proposed concept. Theoretical, simulated, and experimental results of resonant frequency of the dielectric resonant antenna have been compared and are found to be in agreement with each other.

Evaluation of resonant frequency of a cylindrical probe-fed DR antenna

The eigenmode expansion method is used to evaluate the resonant frequency of a probe fed cylindrical dielectric resonator (DR) antenna, which radiates above an infinite conducting ground plane. A parallel grounded conducting plane is added above the DR, thus allowing the use of cylindrical harmonic field expansions in the regions between the two parallel ground planes. The eigenmode expansion coefficients are found by enforcing the boundary conditions at conducting surfaces and regional interfaces. Then, from the induced currents on the probe surface, the input impedance and the resonant frequency of the DR antenna are evaluated. The results are compared with those of a previous configuration which has no upper ground plane. It is found that the deviation of the calculated resonant frequency is less than 2% for epsilon εr>9.