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Miniaturization and dual-banding of an elevated slotted patch antenna using the novel dual-reverse-arrow fractal

Research paper by Hadi Soleimani, Homayoon Oraizi

Indexed on: 25 Jan '17Published on: 24 Jan '17Published in: International Journal of RF and Microwave Computer-Aided Engineering



Abstract

A novel fractal geometry called dual-reverse-arrow fractal (DRAF) is introduced and compared with various versions of Koch fractals for application to triangular patch antennas. It is shown that DRAF results in the reduction of antenna size and tends to maintain its bandwidth. The presented DRAF is applied for the reduction of size of an elevated triangular patch antenna for the dual band operation in WLAN. This DRAF antenna has achieved 40% size reduction compared to a simple triangular patch antenna. For the provision of required bandwidth in the second frequency band (4.9-5.9 GHz), a stepped U-shaped slot is cut in the triangular patch. This antenna is more compact than similar antennas reported in the literature but maintains its fractional bandwidth (%25). The optimized design of the proposed DRAF antenna with air gap and slot is fabricated and tested, which verifies its expected specifications.