Size Of Dielectric Resonator Antenna Research Articles

A High-Permittivity Dielectric Material-Filled SISL Antenna With Cavity Backing

A high-permittivity dielectric material-filled substrate integrated suspended line (SISL) antenna with size reduction is proposed, which provides a novel fixing method for dielectric resonator antenna (DRA). The proposed antenna is based on five substrate layers with two air cavities while the high-permittivity dielectric material is filled with the upper air cavity of the hollowed substrate. So the antenna is self-packaging. The feeding line is on M5 layer and the bottom air cavity affects the resonant frequency much. The expression about the resonant frequencies, the height of the bottom air cavities, and the size of DRA is given. The operating frequency band is from 6.2 to 6.5 GHz and the maximum antenna gain is 6 dBi. In order to reduce the resonant frequency further, a cross strip is added to M2 layer. At last, the impedance bandwidth for |S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> | <; -10 dB is from 5.7 to 6 GHz and the maximum antenna gain is 5.2 dBi.

DESIGN AND SIMULATION OF DIELECTRIC RESONATOR ANTENNA (DRA) WITH CO-AXIAL PROBE FOR WIRELESS APPLICATION

In this paper a Dielectric resonator antenna (DRA) consists of a rectangular geometry and a printed rectangular patch on top of it in order to achieve better performance and operation without significant increase in antenna size. DRA structure is proposed at a height of 2 mm from the ground plane and patch incorporated at the height of 3.638 mm. This work is mainly focused on increasing the potential parameters of DRA and analyze high frequency band. The proposed antenna is designed to resonate at 25 GHz and by varying the DRA size ‘a, then the simulated results shows variation in Return Loss. The impedance bandwidth of the DRA (23.417 GHz-26.961 GHz) and return loss is 26.543951dB.The proposed DRA is analyzed and design using CST-MSW (2010). The simulated result shows the Far field, smith chart. We have estimated the wavelength, frequency, bandwidth, Return loss and directivity.&#x0D;

Millimeter-Wave Rectangular Dielectric Resonator Antenna Array With Enlarged DRA Dimensions, Wideband Capability, and High-Gain Performance

In this communication, a rectangular dielectric resonator antenna (DRA) is integrated with a backed cavity to enlarge the DRA side length by 1.8 times. The backed cavity also reduces the sensitivity of the DRA resonance to the DRA size, resulting in a relaxed fabrication tolerance. Based on the enlarged DRA design, a stacked DRA (sDRA) is proposed to improve the bandwidth from 8.7% to 15% and enhance the realized gain by an average of 1.5 dB. The proposed mechanisms are verified by fabricating a $4\times4$ sDRA array with an enlarged DRA side length of 1.8 mm ( $0.40 {\lambda }$ ), an improved bandwidth of 62.7–73.9 GHz (16.4%), and an enhanced measured gain of up to 17.2 dBi. The enlarged DRA dimension permits a higher DRA operating frequency without reducing the DRA size. The proposed millimeter-wave (mmW) sDRA array provides a wide bandwidth and high-gain solution for 67 GHz unlicensed band communications.

Wideband circularly polarized sectored conical dielectric resonator antenna excited by S‐shaped slot

AbstractA conical sectored dielectric resonator antenna (DRA) loaded on S‐shaped slot square patch for wideband circular polarization is investigated. Wideband circular polarization (CP) is achieved by single tab extended at right top corner of the square patch along with the introduction of sectors on the top of DRA and S‐shaped slot on the patch. Calculated size of slot along with optimized height and size of DRA through parametric study helps to get wide impedance bandwidth. In addition, optimized size of single tab gives the wide axial ratio bandwidth. The −10 dB impedance bandwidth is 100.18% (2.1–6.0 GHz) and 3‐dB axial ratio (AR) bandwidth is 69.52% (3.0–6.2 GHz). The gain variation is around 3 dBi and radiation efficiency is around 80%–95% within the AR bandwidth. The proposed model is fabricated and measured which agree well with the simulated results.

Wideband Aperture-Coupled Dielectric Resonator Antenna at 5.8 GHz

In this paper, a wideband aperture coupled dielectric resonator antenna (DRA) is presented using a rectangular dielectric resonator to increase operational bandwidth. By choosing a suitable combination of the DRA shape and slot, the resonance frequency from the aperture and DRA can be merged to achieve wideband frequency response without comprising antenna radiation efficiency and polarization. Effects of varying parameter in DRA size, slot dimension and feedline length on return-loss bandwidth are analysed. The proposed technique yields 43% bandwidth in simulation and 21% bandwidth in measurement.

A WIDEBAND TRAPEZOIDAL DIELECTRIC RESONATOR ANTENNA WITH CIRCULAR POLARIZATION

A new design of a circularly-polarized (CP) trapezoidal dielectric resonator antenna (DRA) for wideband wireless application is presented. A single-layered feed is used to excite the trapezoidal shaped dielectric resonator to increase resonant frequency and axial ratio. Besides its structure simplicity, ease of fabrication and low-cost, the proposed antenna features good measured impedance bandwidth, 87.3% at 4.21GHz to 10.72 GHz frequency bands. Moreover, the antenna also produces 3-dB axial ratio bandwidth of about 850 MHz from 5.13 GHz to 6 GHz. The overall size of DRA is 21 mm × 35 mm, which is suitable for mobile devices. Parametric study and measurement results are presented and discussed. Very good agreement is demonstrated between simulated and measured results.

Size-Reduction Method for Dielectric-Resonator Antennas

Size reduction for a single antenna element is desirable for wireless personal communications. Here, a 750/0 size reduction of the dielectric-resonator antenna (DRA) is achieved while maintaining the antenna's bandwidth at the same time by incorporating the concepts of an electric conductor and a magnetic conductor. To validate this concept, infinite perfect electric conductor (PEC) and infinite perfect magnetic conductor (PMC) planes with the presence of the source are used in an ideal situation. A finite electric conductor and a high-dielectric-constant interface are then applied to reduce the dielectric-resonator antenna's size in a realistic situation. The antenna's size is reduced while keeping its frequency band within the original band of the full-size case. For wideband elements, the feed probe in a low-dielectric interface is used to support the concept of magnetic walls. The concept was first confirmed by the examples of full-size and reduce-sized cylindrical dielectric-resonator antennas. It was then applied to rectangular-cup dielectric-resonator antennas, simulated numerically, and confirmed experimentally. More than a 30% impedance bandwidth was achieved by a quarter-size case with a 50 ohm hook-shaped coaxial probe placed off the antenna's axis. Results indicated that a 750/0 size reduction could easily be achieved for the dielectric-resonator antenna.