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.

All-dielectric photonic-assisted radio front-end technology

Abstract: The threats to civil society posed by high-power electromagnetic weapons are viewed as a grim but real possibility in the world after 11 September 2001 (refs 1–3). These weapons produce a power surge capable of destroying or damaging sensitive circuitry in electronic systems. Unfortunately, the trend towards circuits with smaller sizes and voltages renders modern electronics highly susceptible to such damage. Radiofrequency communication systems are particularly vulnerable, because the antenna provides a direct port of entry for electromagnetic radiation. Here, we report a type of radiofrequency receiver front end featuring a complete absence of electronic circuitry and metal interconnects, the traditional ‘soft spots’ of a conventional radiofrequency receiver. The device exploits a dielectric resonator antenna to capture and deliver the radiofrequency signal onto an electro–optic field sensor. The dielectric approach has an added benefit in that it reduces the physical size of the front end, an important benefit in mobile applications.

Double resonant wideband patch antenna and method of forming same

Abstract: A double resonant wideband patch antenna (100) includes a planar resonator (101) forms a substantially trapezoidal shape having a non-parallel edge (103) for providing a substantially wide bandwidth. A feed line (107) extends parallel to the non-parallel edge (103) for coupling while a ground plane (111) extends beneath the planar resonator for increasing radiation efficiency.

A Novel Pattern-Reconfigurable Cylindrical Dielectric Resonator Antenna With Enhanced Gain

Abstract: A cylindrical dielectric resonator antenna with switchable beams is proposed in this letter. The high-order HEM 21(1 + δ) mode of cylindrical dielectric resonator is excited at 5.8 GHz for high gain and quasi-endfire radiation pattern for the first time. Eight switches, whose locations are carefully optimized, are used to control the beam directions. By turning on one of the eight PIN diodes, the proposed antenna can rotate the beam to the opposite direction of the switch. For each direction, the antenna exhibits high gain (7.27 dBi), high efficiency (86.1%), low cross-polarization level, and similar radiation patterns. With these advantages, the antenna can be widely applied in wireless communication systems, especially for multiple-input-multiple-output (MIMO) systems.

Alternative surface integral equation-based characteristic mode analysis of dielectric resonator antennas

Abstract: Dielectric resonator antennas are widely used in wireless communication systems. A theory of characteristic modes (CMs) for modal analysis of dielectric resonators is highly demanded. Although a few earlier studies had proposed CM theory for modelling scattering from dielectric bodies, the physical characteristics of these CMs and their eigenvalues are not as clear as that of those for conducting bodies. This study revisits the CM theory for dielectric resonators. Following the Poynting's theorem and the PMCHWT (Poggio, Miller, Chang, Harrington, Wu, and Tsai) equation, two generalised eigenvalue equations are formulated. The resultant eigenvalues possess clear physical meanings that are the same as those of perfectly electrically conducting problems. In addition, other possible CM formulations based on the PMCHWT equation are also discussed. Mathematical proofs are given in the Appendix to show how to formulate CM theory to physically describe the fundamental resonant modes of dielectric resonators. Numerical results are given to show the proposed CM formulations are effective in solving resonant frequencies and modal fields for dielectric resonators.

Optically detected magnetic resonance imaging with an electromagnetic field resonator

Abstract: Measuring a sample includes providing a magnetic field at the sample using an electromagnetic field resonator. The electromagnetic field resonator includes two or more resonant structures at least partially contained within dielectric material of a substrate, at least a first resonant structure configured to provide the magnetic field at the sample positioned in proximity to the first resonant structure. The sample is characterized by an electron spin resonance frequency. A size of an inner area of the first resonant structure and a number of resonant structures included in the electromagnetic field resonator at least partially determine a range of an operating resonance frequency of the electromagnetic field resonator that includes the electron spin resonance frequency. Measuring the sample also includes receiving an output optical signal from the sample generated based at least in part on a magnetic field generated by the electromagnetic field resonator.