Compact wideband Koch fractal printed slot antenna

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© The Institution of Engineering and Technology
Published 30/07/2012

Abstract

A compact wideband printed slot antenna, suitable for wireless local area network (WLAN) and satisfying the worldwide interoperability for microwave access (WiMAX) applications, is proposed here. The antenna is microstrip-fed and its structure is based on Koch fractal geometry where the resonance frequency of a conventional triangular slot antenna is lowered by applying Koch iterations. The antenna size inclusive of the ground plane is compact and has a wide operating bandwidth. The proposed second iteration Koch slot antenna operates from 2.33 to 6.19 GHz covering the 2.4/5.2/5.8 GHz WLAN bands and 2.5/3.5/5.5 GHz WiMAX bands. The antenna exhibits omnidirectional radiation coverage with a gain better than 2.0 dBi in the entire operating band. Design equations for the proposed antenna are developed and their validity is confirmed on different substrates and for different slot sizes.

Inspec keywords: WiMax; slot antennas; fractal antennas; microstrip antennas; wireless LAN; broadband antennas; geometry; antenna radiation patterns; antenna feeds

Other keywords: WLAN; WiMAX; microstrip-fed antenna; antenna radiation pattern; Koch fractal geometry; wideband Koch fractal printed slot antenna; worldwide interoperability for microwave access application; wireless local area network; frequency 2.33 GHz to 6.19 GHz

Subjects: Computer communications; Antenna accessories; Single antennas; Combinatorial mathematics; Local area networks; Combinatorial mathematics; Radio links and equipment; Metropolitan area networks

References

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      • Chen, W.-S.: `A novel broadband design of a printed rectangular slot antenna for wireless applications', Microw. J., 2006, 49, (1), p. 122-130
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      • Chen, W.-S., Hsieh, F.-M.: `A broadband design for a printed isosceles triangular slot antenna for wireless communications', Microw. J., 2005, 48, (7), p. 98-112
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