Abstract
A miniaturized butterfly-shaped microstrip patch antenna is proposed for unlicensed millimeter wave band applications. The overall dimensions of the proposed antenna are (20 × 18 × 1.6) mm3 or (3.93 × 3.54 × 0.314)λ0 3 with rectangular defected ground structure, which is etched on the ground plane to improve its performances. This configuration achieved an ultra-wide bandwidth (UWB) of 7 GHz (26%) and 22 GHz (37.9%) with radiation efficiencies of 92% and 61%, covering the frequency range from 19.3–25.2 GHz to 48–70 GHz, respectively. The reflection coefficient of the antenna is −41.2 dB with a peak gain of 12.4 dBi at the 56.6 GHz and 10 dBi at 61.4 GHz resonating frequency. Further, the analysis of the proposed antenna is done by different feeding techniques like coaxial, inset feed, gap coupled, aperture coupled and proximity coupled. Considering the size, bandwidth and gain, the microstrip antenna is applicable for unlicensed 57–64 GHz wireless applications for the short-range and high-speed communications like WPAN, WLAN, Intelligent Transport System, Smart Automobiles and Gi-fi. All the simulation results have been performed on Ansys HFSS v.13.1. Proposed antenna has been fabricated on the PCB board.
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