volume | PIER Journals

Abstract

A triangle-shaped proximity-fed circularly polarized antenna with a modified fractal ground structure is introduced in this paper. The antenna's ground plane is employed with a fractal-shaped corporate feed type cut, which helps produce the circular polarization. The proximity feed is offset from the center to generate the orthogonal modes; furthermore, the fractal modified ground aids in enhancing the axial ratio bandwidth. Different iterations of the basic fractal unit improve the polarization purity and the axial ratio bandwidth. The designed antenna reflection coefficients below -10 dB at 2.45 GHz show an impedance bandwidth of 250 MHz (2.25 GHz to 2.50 GHz) and axial ratio bandwidth of 90 MHz (2.40 GHz to 2.49 GHz). The simulated and measured results show a good agreement.

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Dr. Ramya Radhakrishnan

Dr. Shilpi Gupta