Analysis of a Dielectric Resonator Antenna by Applying a Combined Semi-Analytical Method and Simulation

Abstract

The radiation properties of a hemispherical dielectric resonator, consisting of a monopole antenna placed in a dielectric hemisphere is theoretically examined. A method based on the combination of Green's function theory, in conjunction with the Method of Auxiliary Sources (MAS), is used to solve analytically and calculate the electromagnetic field at any arbitrary point of the structure. The Green's function theory is used to calculate the response of the hemisphere to an excitation consisting of an elementary dipole placed inside its volume. The Method of Auxiliary Sources (MAS) is applied by distributing a set of elementary dipoles along the axis of the antenna probe. A number of matching points, lying on the surface of the cylindrical antenna, are used to calculate the dipole moments of the auxiliary sources, by imposing appropriate boundary conditions. Additionally, the input impedance and the current distribution on the antenna are also derived through application of the above-mentioned methodology. The numerical results are finally validated by comparing them with the simulation results of the relevant configuration elicited using a commercial simulation FEM tool.

Rectangular Waveguide-Fed Hemispherical Dielectric Resonator Antenna

“…The real part is obtained by evaluating the integral given by (33) for k 2 x + k 2 y ≤ k 2 ,and the imaginary part by evaluating the integral for k 2 x + k 2 y ≥ k 2 . These two regions correspond to the visible region (radiation field) and the invisible region (evanescent field) respectively.…”

“…It has been shown that dielectric resonator antennas (DRA) can be used as effective radiators at microwave frequencies where ohmic losses become a serious problem for conventional metallic antennas [1][2][3][4]. DRAs offer several advantages such as small size, low cost, light weight, ease of excitation and ease of integration with active circuitry.…”

Adaptively Accelerated Gmres Fast Fourier Transform Method for Electromagnetic Scattering

“…However, the introduction of the inner GMRES method also consumes much computational costs. And the overall convergence improvement depends on the balance of the acceleration effect and the added computational cost [19][20][21][22][23][24][25][26][27][28].…”

A Novel Hybrid Design of Printed Hemi-Cylindrical Dielectric Resonator Monopole Antenna With Multibands Operation

“…Another MOM numerical study of split cylindrical dielectric resonator antennas on a conducting ground plane excited by a coaxial probe with a bandwidth of 35% is previously presented in [12]. In addition, the other analytical simulations on the various DRAs were presented in [13,14]. In these studies, not only, the analyses on the DRA with multiband operation have been not done, but also, the majority of the used dielectrics have low permittivity which simplifies the design.…”