P. Prajapati, G. G. K. Murthy, A. Patnaik, M. V. Kartikeyan
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Asymmetrical plus shaped fractal slotted multilayered Yagi-Uda circularly polarized microstrip antenna with DGS
A novel asymmetric plus shaped fractal slotted microstrip antenna with a Yagi-Uda concept for circularly polarized radiation and high gain has been proposed for radio frequency identification (RFID) applications. Four asymmetric plus shape slots are embedded symmetrically in the center of all four quadrants of square patch. To increase the gain, Yagi-Uda concept has been proposed. To suppress undesirable higher harmonics, dumbbell shape defected ground structure (DGS) has been introduced at the ground layer of the antenna. To compensate the reduction of the gain due to DGS, self-similar structure (fractal) of plus shape is integrated with all four plus shape slots. The 3 dB axial ratio (AR) bandwidth of 4 MHz at center frequency of 862 MHz, 10 dB impedance bandwidth of 13.20 MHz and a gain of 4.25 dB have been achieved with the proposed antenna.
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