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.

Dual-Fed Hollow Dielectric Antenna for Dual-Frequency Operation With Large Frequency Ratio

Abstract: A new dual-fed dual-frequency antenna that integrates a microwave hollow dielectric resonator antenna (DRA) with a high-gain millimeter-wave dielectric Fabry–Perot resonator antenna (FPRA) is investigated. To obtain the dual-frequency operation, the dielectric and air regions of the hollow DRA are designed to satisfy the resonance condition of the FPRA. The DRA and FPRA are excited by a strip and a WR-34 waveguide, respectively. For demonstration, a prototype that covers both 2.4- and 24-GHz ISM bands was fabricated and tested. The S-parameters, radiation pattern, antenna gain, and antenna efficiency are studied, and reasonable agreement between the measured and simulated results is found.

A Three-Port MIMO Dielectric Resonator Antenna Using Decoupled Modes

Abstract: In this letter, we propose a three-port multiple-input–multiple-output (MIMO) dielectric resonator antenna using three mutually decoupled and near-degenerate modes for X -band applications. To achieve decoupling, two of the three excited modes are chosen such that there is low mutual spatial overlapping between their field magnitudes; then, a third mode is imposed such that its field components are perpendicular to the other two modes. The impedance bandwidths of the three ports are 880 MHz, 870 MHz, and 2.61 GHZ, respectively, where contiguous bandwidth for the third port is achieved by utilizing the overlap of two resonances of $TE_{2 \delta 1}^{y}$ mode. The proposed antenna could be used either as a three-port MIMO antenna with operating bandwidth of 720 MHz, or as a two-port MIMO antenna with operating bandwidth of 880 MHz, at center frequency of 9.48 GHz. The gains of the three patterns at center frequency are 8.1 dB, 7.5 dB, and 7.4 dB, respectively.

Single-port multi-resonator acoustic resonator device

Abstract: A single port multi-resonator acoustic resonator device ( 200, 300, 400, 490 ) possesses an input impedance that exhibits precisely designed electrical resonances. The device contains at least three parts: a transducer/resonator ( 201, 301, 401. 491 ) used both to interface to an external electrical circuit and to transform electrical energy into mechanical (i.e. acoustic) vibrations (and vice versa), and also function as a resonator; a mechanical (i.e. acoustic) resonator ( 203, 303, 460, 480 ) and an acoustic coupler ( 202, 302, 404, 494 ) that controls the acoustic interaction between the transducer/resonator and the mechanical resonator.

System and method for electron spin resonance

Abstract: A resonator system for electron spin resonance (ESR) is disclosed. The resonator system comprises: a generally planar resonator layer defining an open-loop gapped by a non-conductive gap in the layer, and a microwave feed, positioned configured for transmitting microwave to the resonator layer such as to concentrate, with a quality factor of at least 100, a magnetic field within an effective volume of less than 1 nL above the layer.

A Transmission Line Method to Compute the Far-Field Radiation of Arbitrarily Directed Hertzian Dipoles in a Multilayer Dielectric Structure: Theory and Applications

Abstract: A transmission line method is proposed to compute the far-field radiation patterns of arbitrarily directed Hertzian dipoles that are embedded in a multilayer dielectric structure. The evaluation of the field in the far-zone region is transformed into the evaluation of the field inside the multilayer structure by applying the reciprocity theorem. The horizontal field component inside the structure is derived by analyzing a transmission line circuit, and the vertical component is obtained from the horizontal component by separating the forward and backward waves. This method is implemented and verified by IE3D for the case of a three-layer structure excited by either electric Hertzian dipoles, magnetic Hertzian dipoles, or their combination. The radiation patterns of any antenna embedded in a multilayer dielectric structure can be computed with this method after replacing the physical antenna with a set of Hertzian dipoles. As examples, a quarter wavelength thin wire monopole antenna and a dielectric resonator antenna, both embedded in a multilayer structure, are investigated. Furthermore, the arrangement of the structure is optimized to maximize the antenna directivity. The results are also verified by the simulation of the entire structure with IE3D