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.

Notch filter network

Abstract: A duplex arrangement of filter networks has, on the transmitter side, a quarter wave cavity resonator tuned to the transmitter carrier frequency and coupled to the coaxial transmission line in quarter wave spaced relation. A variable quarter wave reactance section is similarly coupled to the line and coacts with the resonator to create a condition of anti-resonance at the receiver frequency. On the receiver side, a quarter wave resonator and a variable quarter wave section are similarly coupled to the transmission line a quarter wave from the antenna connection, the resonator being tuned to the receiver frequency, and the reactance section coacting with the resonator reactance to create a condition of anti-resonance at the transmitter carrier frequency. A line connecting the resonator to the transmission line can be of the same characteristic impedance or, if greater attenuation at a greater frequency separation is desired, of a lower characteristic impedance than that of said transmission line.

Dielectric resonator antenna, a candidate for radar applications

Abstract: Dielectric resonator antennas (DRA) are newly developed antennas that are wideband, small size and have high radiation efficiency. An overview of the DRA is presented to show some of their characteristics, such as geometry, matching bandwidth, radiation patterns, etc. Radiation patterns for some arrays are presented for a linearly polarized linear phased array. The circularly polarized DRA in the array environment is discussed. Advantages of using DRA in the radar system are highlighted indicating that the DRA is an appropriate candidate for radar applications mainly because of high efficiency and wideband performance.

Bandwidth Enhancement and Radiation Characteristics Improvement of Rectangular Dielectric Resonator Antenna

Abstract: -A simple, compact, wideband rectangular dielectric resonator antenna (RDRA) is presented. The bandwidth is enhanced using a proper tapered strip excitation from one side of the DR. The radiation characteristics are improved by adding a shorted narrow strip to the opposite side of the excitation. In addition, by using this shorted strip, further improvement of the bandwidth is obtained. A parametric study on the strip dimension is carried out. The proposed DRA with good radiation characteristics offers a measured bandwidth of 96% between 2.13 and 6.08 GHz for VSWR <; 2.

An Accurate Solution of the Cylindrical Dielectric Resonator Problem

Abstract: A cylindrical sample of low-loss high-epsilon/sub r/, dielectric placed between two parallel conducting plates perpendicular to the sample axis forms a microwave resonator. A new method of determining the field distribution and resonant frequency of this resonator is presented. By this method the solution is obtained in a form of successive approximations converging to the exact solution. The analysis is outlined in detail for the TE/sub 01delta/ mode and compared with previously published approximate calculations and experimental data.

Micro-machined resonator oscillator

Abstract: A micro-miniature resonator-oscillator is disclosed. Due to the miniaturization of the resonator-oscillator, oscillation frequencies of one MHz and higher are utilized. A thickness-mode quartz resonator housed in a micro-machined silicon package and operated as a "telemetered sensor beacon" that is, a digital, self-powered, remote, parameter measuring-transmitter in the FM-band. The resonator design uses trapped energy principles and temperature dependence methodology through crystal orientation control, with operation in the 20-100 MHz range. High volume batch-processing manufacturing is utilized, with package and resonator assembly at the wafer level. Unique design features include squeeze-film damping for robust vibration and shock performance, capacitive coupling through micro-machined diaphragms allowing resonator excitation at the package exterior, circuit integration and extremely small (0.1 in. square) dimensioning. A family of micro-miniature sensor beacons is also disclosed with widespread applications as bio-medical sensors, vehicle status monitors and high-volume animal identification and health sensors. The sensor family allows measurement of temperatures, chemicals, acceleration and pressure. A microphone and clock realization is also available.