Abstract
A new ultawideband circular fractal antenna with notched-band characteristics is presented. A notched-band characteristic is achieved by employing a U-shape slot in 50 Ω feed lines. The ultra-wideband impedance matching and compact size have been obtained by using CPW-feed technique and the fractal concept. The measured result of proposed fractal antenna exhibits the ultra wideband characteristics from 3.0 to 18.0 GHz at VSWR 2:1 except notched-band frequency. The proposed antenna has been analyzed theoretically and experimentally with respect to design parameters. The measured radiation pattern of fractal antenna is nearly omnidirectional in azimuth plane throughout the operating frequency. This antenna is useful for UBW communication system.
Highlights
Ultra-wideband (UWB: 3.1-10.6 GHz) communication system has become more and more popular because of its advantages such as small size, high transmission rate, and low power consumption comparing with current wireless communication system [1]
It is noticed in simulation that the operating bandwidth of the proposed antenna is heavily dependent on the gap between patch and ground, iteration number and notched-band depends on length of slot and width of slot
The experimental results of proposed fractal antenna without slot acquired from the Vector Network Analyzer exhibits the excellent ultra wide impedance bandwidth of 11.99 GHz corresponds to 132.49% impedance bandwidth for VSWR 2:1
Summary
Ultra-wideband (UWB: 3.1-10.6 GHz) communication system has become more and more popular because of its advantages such as small size, high transmission rate, and low power consumption comparing with current wireless communication system [1]. Because of these advantages of an UWB system, significant research in the UWB antennas has been aroused in academic and industrial fields recently. The UWB antenna with notched-band performance is required. This work proposed the UWB fractal antenna band-notched characteristics with detail study. A new circular fractal antenna with bandnotched is proposed for the UWB system applications. The performance of the proposed antenna is characterized in term of impedance bandwidth, band-notched and radiation pattern
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