Abstract
In this paper, we have achieved two ultra wideband antennas by applying fractal geometry with co-planar waveguide (CPW) feeding technique. These antennasare designed on dielectric substrate εr= 4.3 and thickness h = 1.53 mm. The return loss of first antenna design is achieved a good input impedance matching throughout the pass band from 2.5 GHz to 11GHz. The second antenna offers the impedance matching from frequency range 2.1GHz to 12GHz. The proposed antennas can provide an impedance bandwidth more than100% at VSWR<2. Second antenna helps to increase impedance bandwidth by reducing the ground plane. The simulated radiation pattern of antenna is nearly omni-directional. Such type of antenna can be useful for mobile and wireless communication. Keywords: Microstrip antenna, monopole antenna, CPW-feed and UWB antenna.
Highlights
Modified ground plane with curves Initially, the monopole fractal antenna is simulated with the simple rectangular ground plane
As the length of the ground plane increases, the return loss curve is shifted to the lower frequency side
As the width of the ground plane increases, the return loss curve is shifted to lower frequency side
Summary
To make the structure of Apollo fractal antenna, first three circles of diameter 75mm are arranged in such a Research article “UWB antenna”. Modified ground plane with curves Initially, the monopole fractal antenna is simulated with the simple rectangular ground plane. The ground plane length and width are taken to be 35.39 mm x 24.0 mm With this rectangular ground plane required UWB impedance bandwidth has not achieved. Return loss is not less than -10dB throughout the band with rectangular shaped ground plane as shown in Fig. 5.A parametric study and some modification of ground is required to achieve the impedance bandwidth throughout the band. As the length of the ground plane increases, the return loss curve is shifted to the lower frequency side.
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