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.

Film bulk acoustic resonator having supports and manufacturing method therefore

Abstract: A film bulk acoustic resonator (FBAR) has a support structure, a piezoelectric resonator, and a signal line that is electrically connected, e.g., through a via, to the piezoelectric resonator, all on a semiconductor substrate. Support(s) and/or the via mount the piezoelectric resonator at a predetermined distance from the semiconductor substrate, allowing an ideal shape of the resonator to be realized. The signal line may include a patterned inductor. A capacitor can be formed between the via and the signal line. The resonance characteristics can be enhanced since the substrate loss caused by the driving of the resonator can be prevented due to an air gap formed by the predetermined distance. The resonance frequency can be adjusted by altering the pattern of the inductor, the capacitance of the capacitor and/or the thickness of the piezoelectric layer, also allowing Impedance matching to be readily realized.

Optical-coupled resonator structures based on loop-coupled cavities and loop coupling phase

Abstract: A resonator structure includes an input waveguide and an output waveguide. In one embodiment, the resonator structure also includes at least one resonator that couples the input waveguide to the output waveguide and a directional coupler that optically couples the input waveguide to the output waveguide. In another embodiment, the resonator structure includes a plurality of ring resonators that couple the input waveguide to the output waveguide. The plurality of ring resonators include a sequence of ring resonators that form a coupling loop. Each ring resonator in the sequence is coupled to at least two other ring resonators in the sequence and the first ring resonator in the sequence is coupled to the last ring resonator in the sequence so as to form the coupling loop.

Implementation of a Frequency-Agile MIMO Dielectric Resonator Antenna

Abstract: The design and implementation of a two-port frequency-reconfigurable multiple-input multiple-output (MIMO) dielectric resonator antenna is described in detail. The frequency agility is achieved by the addition of reconfigurable parasitic slot loadings in proximity to the dielectric resonator block. Because of the orthogonality between the two radiating ports, the operating frequency of each port can be individually tuned without significantly affecting the frequency response of the other port. Hence, the proposed antenna can have two modes of operation: multifrequency mode and MIMO mode. In the multifrequency mode, the antenna ports can independently sweep through the frequency band of interest and look for nearby potential users. On the other hand, the antenna ports can be reconfigured into an MIMO antenna to boost up the capacity whenever heavy data traffic is required and the channel condition is appropriate. These capabilities make the antenna suitable for dynamic spectrum-access applications in cognitive radios.

Multilayer metamaterial isolator

Abstract: A multilayer metamaterial isolator and method of fabricating the same A first layer or surface of a multilayer dielectric substrate includes a first leg of a first resonator loop A second layer or surface of the multilayer dielectric substrate includes a second leg of the first resonator loop A third leg of the first resonator loop extends through the multilayer dielectric substrate interconnecting the first and second legs of the first resonator loop

The air gap effect on a microstrip‐coupled cylindrical dielectric resonator antenna

Abstract: The effect of the air gap between a cylindrical dielectric resonator antenna and a microstrip line on the resonant frequency, directivity, unloaded Q-factor, and impedance bandwidth are studied. The antenna structure is numerically simulated with a software package based on the finite-element method. Appropriate correction factors are obtained, enabling an antenna engineer to incorporate the air-gap effect into the design of a microstrip-coupled cylindrical dielectric resonator antenna. The correction factors provide good agreement with the measured results in resonant frequency, unloaded Q-factor, and impedance bandwidth, but less accurate prediction in directivity for the specified range of parameters. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 20: 36–40, 1999.