Aperture-coupled cylindrical dielectric resonator antenna

Abstract

An aperture‐coupled CDRA is theoretically and experimentally investigated. The effects of: 1) the aperture size and 2) the air gap between the CDRA and the aperture on the resonant frequency, return loss, radiation pattern, directivity, unloaded Q‐factor, and impedance bandwidth are numerically simulated. Based on the numerical results obtained, simple closed‐form expressions are obtained enabling an antenna engineer to incorporate these effects into the design of an aperture‐coupled CDRA. The predicted results were experimentally verified for several aperture sizes, and good agreement was obtained. Results showed that the feeding scheme and the fabrication imperfections have a significant effect on the performance of CDRAs. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 20: 407–414, 1999.

Compact slot and dielectric resonator antenna with dual-resonance, broadband characteristics

“…The lack of agreement between the return losses of the simulated and measured designs may be due to an air gap between the ground plane and the resonator which is absent in simulations. The effect of such an air gap is studied extensively in [21]- [23]. Also, the simulation parameters and lengths are limited by the resolution of the FDTD grid.…”

Rectangular Dielectric Resonator Antenna With Corrugated Walls

“…This value for the air gap is chosen based on the measurement results, so that by considering it a good agreement between the simulation and measurement results is attained. Different values of the air gap thickness between the bottom layer of the DRA and the ground plane [22]- [24] and also between the layers of the DRA [27] have been reported. It ranges from 0.02 mm to 0.152 mm.…”

“…Note that the air gap between the layers and also between the bottom layer and the ground plane is inevitable. The effect of such an air gap is studied extensively in [22]- [24]. So, its effect on the antenna performance should be studied and quantified.…”

Magnetic quadrupole mode excitation of a cylindrical dielectric resonator antenna using planar feed

“…The most explored mode of a cylindrical dielectric resonator antenna (CDRA) is the broadside radiating magnetic dipole mode HEM 11δ . [3][4][5][6] Certain higher order modes (HOMs) of the DRA with low Q-factors also radiate efficiently giving unique radiation patterns, for example, the electric monopole or TM 01δ mode of a cylindrical ring DRA gives broadside-null pattern 7 and the HEM 12δ mode of a CDRA gives highly directive broadside pattern. 8 HOMs are excited in combination also to enhance the gain 9 and bandwidth.…”

“…The last feature implies the capability of the DRA to support different types of radiation patterns through the excitation of different radiating modes with most of the feeding techniques. The most explored mode of a cylindrical dielectric resonator antenna (CDRA) is the broadside radiating magnetic dipole mode HEM 11δ . Certain higher order modes (HOMs) of the DRA with low Q‐factors also radiate efficiently giving unique radiation patterns, for example, the electric monopole or TM 01δ mode of a cylindrical ring DRA gives broadside‐null pattern and the HEM 12δ mode of a CDRA gives highly directive broadside pattern .…”