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.

Ceramic multilayer helical antenna for portable radio or microwave communication apparatus

Abstract: A small and durable antenna for use with radio and microwave communications is formed as a helical conductor contained in a multilayered non-ferrite ceramic chip. The dielectric constant of the ceramic is selected to match the antenna to its operating frequency, which may be in the range of 0.5 to 10.0 Gigahertz. A process for making such antennas is also disclosed. The antenna may be used in portable terminals and other devices requiring small, durable and inexpensive antennae.

A Novel Small Triple Band Rectangular Dielectric Resonator Antenna for WLAN and WiMAX Applications

Abstract: A novel triple band rectangular dielectric resonator antenna is presented for satisfying wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) applications simultaneously. The proposed triple-band antenna operates at 2.4 GHz/3.5 GHz/5.8 GHz. By using three plexiglass dielectrics on FR4 board, a very low cost antenna is designed. In addition, a modified version of the rectangular dielectric resonator antenna, which has three-segment thin dielectrics with different sizes, provides omnidirectional radiation over the frequency bands. The antenna is fabricated, and a good agreement is achieved between the simulated and measured results. The designed triple-band antenna with extremely low cost and low profile is very suitable for multiband mobile communication systems. To the authors' knowledge, this is the first triple band dielectric resonator antennas (DRAs) presented with stable radiation patterns (nearly omnidirectional pattern) for each operating band.

Reducing Anchor Loss in MEMS Resonators Using Mesa Isolation

Abstract: In microelectromechanical systems resonators, dissipation of energy through anchor points into the substrate adds to resonator energy loss, contributing to low values of Q. A design for improving Q based on the reflection of anchor-generated surface acoustic waves is presented here. In this design, the resonator is surrounded by a trench, or a mesa, that partially reflects the wave energy back to the resonator. Depending on the distance from the resonator to the mesa, the reflected wave interferes either constructively or destructively with the resonator, increasing or decreasing Q. The proposed design is experimentally tested using a dome-shaped flexural mode resonator for a range of distances of the mesa from the resonator. Improvements in Q of up to 400% are observed. The resonator/mesa system is modeled using a commercially available finite-element code. Experiments and simulations compare well, suggesting that a finite-element-method analysis can be used in the preliminary design of mesas for the optimization of Q. The concept of using mesas to improve Q is simulated for both flexural and in-plane modes of vibration.

Dielectric resonator antenna

Abstract: This article is focused on using a dielectric resonator as a radiating element of a antenna with the aim to reduce dimensions of such antennas compared to classical microstrip antennas. Such antenna was build and its parameters tested in frequency band of 2.9 to 3.1 GHz.

Laser Stabilization on a Fiber Ring Resonator and Application to RF Filtering

Abstract: The potential of optical fiber ring resonators for radio frequency (RF) or microwave signals filtering on optical carriers is demonstrated on a short length high Q resonator. The problem of the frequency shift due to the resonator self heating with the optical power is solved thanks to a Pound-Drever feedback loop. A multifrequency RF filter is obtained, with a frequency step of 205 MHz between resonances, and a 3-dB bandwidth of 2.4 MHz. This corresponds to the computed optical resonator 3-dB bandwidth, and thus represents an efficient technique for the measurement of ultrahigh Q optical resonators. In the field of microwave applications, the equivalent Q -factor obtained is particularly interesting in the upper microwave range.