Numerical Analysis and Design of a New Simple Compact Ultra-Wideband Dielectric Resonator Antenna with Enhanced Bandwidth and Improved Radiation Pattern
关键词:
Dielectric resonator antenna (DRA), finite difference time domain (FDTD), omnidirectional pattern, ultra-wideband (UWB) antenna摘要
A new simple compact ultra-wideband (UWB) dielectric resonator antenna (DRA) is presented. The finite-difference time-domain (FDTD) method is used to the full-wave analysis of this structure. The antenna consists of a modified stepped microstrip fed monopole printed antenna loaded with a rectangular dielectric resonator, truncated ground plane and a parasitic strip underneath the dielectric resonator (DR). By using an optimized truncated ground plane and a combination of stepped feed line with dielectric resonator, an ultra-wide impedance bandwidth of 153% for (S11 ? -10 dB), covering the frequency range of (3.7–28 GHz) is achieved. The added parasitic strip can improve the radiation pattern, especially at high frequencies. The proposed antenna covers almost the entire UWB (3.1–10.6 GHz), Ku (12.4–18 GHz) and K (18–26.6 GHz) frequency bands. Also, this antenna has an omnidirectional and stable radiation pattern over the whole operating frequency range and a compact size of (15×20×5.8 mm3 ) that make it suitable for wideband wireless system applications. This structure is light weight and can be easily fabricated. A prototype is built and measured. The simulated and measured results are in good agreement with the computed FDTD result.
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