부산대학교 도서관

This research work presents analysis of the effect of micro-machining on the performance parameters of a wideband fractal patch antenna. Finite element method based High Frequency Structure Simulator (HFSS) has been used to design and analyze Micro-machined (MM) patch fractal antenna. An optimized air cavity in FR4 substrate has been created using milling process. The proposed design has shown improvement in reflection coefficient (S 11 ), gain. and efficiency as compared to conventional antenna design. The proposed MM antenna resonates at 2.63 GHz, 3.75 GHz and 5 GHz and has an impedance bandwidth of 104.8%. Micro-machining at all three resonance frequencies increased the antenna gain by 111.5%, 692.8% and 178% and the efficiency by 8.95%, 10.8% and 12.7%, respectively. The proposed antenna is cost effective, and useful for applications such as: Wi-Fi, WiMax, WLAN, radiolocation, sub-6 GHz 5G Communication, and telemetry. After prototyping the proposed design the antenna has been tested, and a good agreement between simulated and measured results have been found. Novelty-Micro-machining has been used successfully to improve the performance parameters of FR4 substrate based fractal patch antenna by overcoming the losses in substrate.