8th International Conference on Microwaves, Antenna, Propagation & Remote Sensing ICMARS-2012, Jodhpur, INDIA, Dec. 11 – 15, 2012
Symmetrical T-Shaped DRA with Unique Microstrip Excitation for Wideband Applications Jitendra Kumar1 and Navneet Gupta2 1&2
Department of Electrical and Electronics Engineering, Birla Institute of Technology and Science, Pilani, Pilani, Rajasthan 333031, India 1
2
[email protected] [email protected]
Abstract— This paper investigates return loss, radiation pattern, impedance bandwidth and other radiation parameters of symmetrical T-shaped dielectric resonator antenna (DRA) and analyses these parameters within the frequency range of 3GHz to 9GHz. The goal of this study is to improve the radiation characteristics of the antenna. T-shaped DR is located at the center of the substrate with low dielectric constantε𝒓𝒓𝒓𝒓= 2.6. The proposed technique combines a unique Y-type microstrip excitation and T-shaped DRA to effectively double the conventional microstrip feed DRA bandwidth without compromising miniaturization and efficiency. This T shaped DRA achieves a -10-dB impedance bandwidth of about 81.1%, while covering the frequency range from 3.83 GHz to 8.21 GHz with improved radiation pattern. An average peak gain of 5dB over the bandis achieved.Ansoft HFSS is used to simulate the DRA performance and the results are also verified with 3-D EM solver CST-Microwave Studio. Both results are in close agreement with each other, which shows the validity of proposed design. Keywords—Dielectric Resonator Antenna, Y-Shaped microstrip patch, Wideband, Symmetrical T-shaped Dielectric Resonator and Compact.
I. INTRODUCTION In the past two decades, due to numerousinteractive features like high radiation efficiency, light weight, small size, low profile, low temperature coefficient of frequency, zero conductor losses and suitable scale in microwave band, the dielectric resonator antennas (DRAs) have attracted the antenna designers in microwave and millimeter wave band [1,2]. The shape of the DRA can be hemispherical, cylindrical, or rectangular. Among these shapes, the rectangular one has the largest number of design parameters (width, length, and height), facilitating theantenna design.Dielectric resonators (DRs) of low loss dielectric material, having medium dielectric constant of 10
