Multiband CPW-fed Circular Microstrip Antenna with Modified Cantor Fractal Slot for DCS/GPS/WiMAX/WLAN/HiPERLAN2 Applications

Abstract

In this paper, a compact triple band circular microstrip antenna with modified Cantor fractal slot for DCS (1.71–1.85 GHz), GPS (1.575 GHz), WiMAX (3.3–3.5 GHz), WLAN (5.15–5.35/5.725–5.825 GHz), HiPERLAN2 (5.15–5.35/5.47–5.725 GHz) applications is designed and discussed. The proposed antenna consists of a circular microstrip antenna loaded with a Cantor fractal slot. The branch length of the Cantor fractal slot is varied asymmetrically according to Hamming window function to obtain the triple band operation. Simulation results demonstrate that the proposed antenna resonates in three distinct frequency bands i.e. 1.5–1.8 GHz, 3.3–3.6 GHz, and 4.7–6 GHz centered around 1.66, 3.48, and 5.54 GHz respectively. A peak gain varies from 0.4 to 8.6 dB across the operating bands. An omnidirectional radiation pattern with good isolation level also obtained at all three resonating frequencies. The proposed antenna incorporates three different wireless standards in itself and offers a compact size of $31\times 30\times 1.6$ mm3 compared to earlier reported antenna structures.