Size Miniaturized Fractal Nested Circular Rings-Shaped Microstrip Antenna for Various Wireless Applications

Abstract

In this paper; a wideband fractal circular rings shapedmicrostrip antenna over partial rectangular ground plane is presented.Fractal geometry technique is used in order to take advantage of its selfsimilarproperty which lead to attain not only size miniaturization butalso wider bandwidth and iteration method is utilized that reach up tothird iteration. The proposed model is simulated by High FrequencyStructural Simulator (HFSS) package. Such model is designed on FR4substrate with a compact size of (20×18×1.5) mm3, 4.3 permittivity and0.02 loss tangent. The microstrip line feed is used to feed this antennawith a length of 4.65mm and width of 3mm, in order to increase theimpedance bandwidth of proposed model to 67.64%. This model isdesigned to operate at a range of frequency (4.5-9.1) GHz with tworesonant frequencies at 5.6GHz and 8GHz. The length of ground planeLg is optimized for enhance antenna parameters such as input reflectioncoefficient and Bandwidth. The simulation results show that the inputreflection coefficient values are -54.5 dB and -46.5 dB at two resonantfrequencies 5.6GHz and 8GHz. Also, radiation efficiency of proposedantenna is 97.29% with peak gain of 4.34dB. This antenna is appropriatefor various wireless Applications such as satellite communication,weather radar, (Industrial Scientific Medical) ISM band and (WirelessFidelity) Wi-Fi