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Abstract
A metamaterial loaded circularly polarized fractal boundary patch antenna is investigated for applications at the ISM band. The suggested patch comprises of Minkowski fractal over metamaterial inspired reactive impedance substrate. Initially, asymmetrical Minkowski fractal curves are deployed at the edges of a square patch for generating the circular polarization (CP). Later, using metamaterial reactive impedance substrate as antenna loading, CP bandwidth is enhanced. The characteristics of the Minkowski fractals are adjusted to obtain the pure CP radiation. The metamaterial loaded Koch fractal antenna is also studied for CP emission. Minkowski antenna with fractal reactive impedance surface as metamaterial with iteration 1 is experimentally examined. The achieved 10-dB return loss and 3-dB axial ratio bandwidths are 40.7% and 7.47%, respectively.
ACKNOWLEDGEMENT
The author thanks Antenna Wing team, RCI Hyderabad, for permitting to take the measurement of the radiation pattern and the axial ratio.
Additional information
Notes on contributors
V. V. Reddy
V V Reddy received his BTech degree (2008) in electronics and communication engineering from Jawaharlal Nehru Technological University Hyderabad, Telangana India. He received MTech degree (2011) in advanced communication systems from National Institute of Technology, Warangal, India. He completed his doctorate degree (2016) from National Institute of Technology, Warangal. Currently, he is working as an associate professor in the Department of ECE, KITS Warangal. His field of study is microstrip fractal antennas and other areas of interest are antenna wave propagation. He has published more than 20 technical papers in various international journals and conferences.