Dielectric resonator antenna

About: Dielectric resonator antenna is a research topic. Over the lifetime, 8199 publications have been published within this topic receiving 111090 citations. The topic is also known as: DRA.

Excitation of dielectric resonator antenna using a soldered-through probe

Abstract: A soldered-through probe is used to excite the dielectric resonator antenna (DRA) A cylindrical ring DRA is used to demonstrate the feasibility of this excitation method The return loss, radiation pattern, and antenna gain of the new configuration are studied

Dielectric resonator for a microwave filter, and a filter including such a resonator

Abstract: A multimode composite resonator, in particular for a microwave filter, includes a resonant cavity, a dielectric resonator element disposed inside the cavity, a tuning element for each mode and a coupling element for coupling between modes. The resonator element is shaped to have plural vertices which are short-circuited together by the conductive walls of the cavity via direct or RF electrical contact between the vertices and the walls. Various geometrical resonator shapes are possible.

Mechanically tunable optical devices such as interferometers

Abstract: An optical device has at least one waveguide with at least one adjacent resonator, where the distance between the resonator and the waveguide can be controllably adjusted to change the optical coupling between the resonator and the waveguide. When implemented as part of an interferometer, the ability to adjust the waveguide/resonator distance—and thereby the optical coupling between them—provides a mechanically tunable interferometer.

On the design of a re-entrant square cavity as resonator for low-frequency ESR spectroscopy

Abstract: The construction and the design equations of a microwave resonator which can be used as sample cavity in a low-frequency ESR spectrometer are described. The resonator, which has the form of a re-entrant square cavity, has a Q factor of the order of 1000 and a maximum filling factor of 0.25. The resonant frequency can be conveniently evaluated using a very simple equivalent circuit which can be adapted to any shape of resonator. Four prototypes have been built and a good match has been found between the experimental values of the resonant frequencies and the theoretical ones. This agreement has been found to be particularly good for low values of the gap thickness.

Dual-Polarized, Broadside, Thin Dielectric Resonator Antenna for Microwave Imaging

Abstract: We present a design for a dielectric resonator antenna (DRA) with dual-polarization characteristics. This antenna is designed for use in a three-dimensional (3-D) microwave tomography system to collect copolar and cross-polar responses. The broadside radiation and dual polarization are achieved by exciting the fundamental mode of the DRA as well as by using two elements of the DRA that are perpendicular to each other. Compared to the conventional rectangular DRA, the proposed antenna is reduced in size by a factor of 6.7. The proposed DRA offers a measured bandwidth of 72% (2.6-5.52 GHz). The performance and radiation characteristics of the antenna are verified experimentally.