Abstract
This paper presents verification of multiband characteristics of a circularly shaped iterative fractal antenna with increasing number of fractal iterations. The four numbers of iterations are considered for this study. Also, the miniaturization characteristics of the fractal antenna with increasing number of fractal iterations have been studied. The proposed 4 th iterated fractal antenna is designed on FR4 substrate (h = 1.56 mm and er = 4.3). The antenna is coaxially fed using surface mount adapter. The proposed circularly shaped fractal antenna is found to resonate at four centre frequencies such as 0.683 GHz, 0.97 GHz, 1.29 GHz, and 1.68 GHz. The antenna finds applications in various compact multiband wireless communications due its smaller size , low cross polarization and multiband behaviour.
Highlights
Multiband antennas have wide-spread its importance in wireless communication due to increasing demands for multichannel communication
The simulated and the measured results for fourth iterated fractal antenna shown in Fig. 4 and table 1 are in close agreement with small differences due to fabrication tolerance
The proposed fractal antenna can be fabricated on low cost FR4 substrate material
Summary
Multiband antennas have wide-spread its importance in wireless communication due to increasing demands for multichannel communication. Fractal patch antennas are capable of providing multiband characteristics as well as compactness. A fractal is an integral part of nature and has applications in antennas for multiband wireless communication. Several fractal antennas have been reported for compact and multiband applications [1]-[16]. Bandwidth in multiband needs to be appropriate to exploit the available data rate in various generations. There are many known methods reported in the literatures [5], [8]-[9] to enhance the antenna bandwidth those include design of the antenna with log-periodic profile, use of a low dielectric substrate, increase of the substrate thickness, use of travellingwave topologies, use of efficient impedance matching and feeding techniques, use of multiple resonators and slot antenna geometry.
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