Triple Band Non-Linear Manipulated Sierpinski-Knopp Fractal Wide-Slot Microstrip Antenna with Inverted L-shaped Strip

In this paper, a compact open ended microstrip-line-fed antenna with Sierpinski Knopp wide-slot for triple band operation is designed and discussed. The proposed antenna consists of a 50 Omega microstrip-line on one side and a Sierpinski Knopp fractal wide-slot as a defected ground structure on the other side of the substrate. The effect of elongation, a non-linear manipulation on antenna characteristics is analyzed. An inverted L-shaped strip is placed inside the wide-slot form a different current path for obtaining the 2.4 GHz WLAN frequency band. Simulation results demonstrate that the proposed antennas resonates in three distinct frequency bands, i.e. 2.4-2.78 GHz, 332-4.03 GHz, and 4.58-5.8 GHz centered around 2.61, 3.56, and 5.03 GHz respectively. The peak gain varies from 1.73 to 6.86 dB across all operating bands. The proposed antenna incorporates three different wireless standards in itself and offers a compact size of 21 x 32 x 1.6 mm(3) as compared to earlier reported antenna structures.