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Design And Analysis of Koch Fractal Antenna for Wlan Applications


Affiliations
1 Department of Electronics and Communication Engineering, Rajiv Gandhi College of Engineering College, India
     

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In this paper, a Koch fractal antenna is designed for Wireless Local Area Network (WLAN) applications. Koch snowflake design is symmetrical and self-similar structure that induces space filling capability and improves the surface current on the antenna. The overall fractal antenna structure consist of a copper foils (Patch and Ground Plane) mounted on either sides of the dielectric material (Flame Retardant-4 (FR-4) with permittivity εr =4.4 and loss tangent δ=0.02). The antenna is fed using a microstrip line feed. The dimensions of the Koch fractal antenna are 30x30x1.6mm3 which is compact sized design made on High Frequency Structure Simulator (HFSS) platform. The simulation outputs are internally compared with different iterations implemented on the patch using Iterated Function System (IFS) and the difference in the radiating frequency, return loss, bandwidth, gain and directivity of all three different iterations. The resonating frequency for three iterations ranges from 5.8GHz to 7.47GHz which can be used in WLAN applications. Thus, the proposed Koch snowflake fractal antenna design provides improvements in the antenna parameters on increasing scale of iteration such as S11 from -21.35dB to -36.32dB, average gain of 3dB and Impedance Bandwidth of 25.90%.

Keywords

Antenna Design, FR-4, Ground Plane, Koch Snowflake, Patch, WLAN Application.
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  • Design And Analysis of Koch Fractal Antenna for Wlan Applications

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Authors

S. Mythili
Department of Electronics and Communication Engineering, Rajiv Gandhi College of Engineering College, India
K. Akshaya
Department of Electronics and Communication Engineering, Rajiv Gandhi College of Engineering College, India
B. Charanya
Department of Electronics and Communication Engineering, Rajiv Gandhi College of Engineering College, India
K. Ayyappan
Department of Electronics and Communication Engineering, Rajiv Gandhi College of Engineering College, India

Abstract


In this paper, a Koch fractal antenna is designed for Wireless Local Area Network (WLAN) applications. Koch snowflake design is symmetrical and self-similar structure that induces space filling capability and improves the surface current on the antenna. The overall fractal antenna structure consist of a copper foils (Patch and Ground Plane) mounted on either sides of the dielectric material (Flame Retardant-4 (FR-4) with permittivity εr =4.4 and loss tangent δ=0.02). The antenna is fed using a microstrip line feed. The dimensions of the Koch fractal antenna are 30x30x1.6mm3 which is compact sized design made on High Frequency Structure Simulator (HFSS) platform. The simulation outputs are internally compared with different iterations implemented on the patch using Iterated Function System (IFS) and the difference in the radiating frequency, return loss, bandwidth, gain and directivity of all three different iterations. The resonating frequency for three iterations ranges from 5.8GHz to 7.47GHz which can be used in WLAN applications. Thus, the proposed Koch snowflake fractal antenna design provides improvements in the antenna parameters on increasing scale of iteration such as S11 from -21.35dB to -36.32dB, average gain of 3dB and Impedance Bandwidth of 25.90%.

Keywords


Antenna Design, FR-4, Ground Plane, Koch Snowflake, Patch, WLAN Application.