Title :
Asymmetrical plus shaped fractal slotted multilayered Yagi-Uda circularly polarized microstrip antenna with DGS
Author :
Prajapati, P.R. ; Murthy, G.G.K. ; Patnaik, A. ; Kartikeyan, M.V.
Author_Institution :
Dept. of Electron. & Commun. Eng., Indian Inst. of Technol., Roorkee, Roorkee, India
Abstract :
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.
Keywords :
Yagi antenna arrays; antenna radiation patterns; microstrip antenna arrays; radiofrequency identification; slot antenna arrays; DGS; RFID applications; bandwidth 4 MHz; dumbbell shape defected ground structure; gain 4.25 dB; novel asymmetric plus shaped fractal slotted Yagi-Uda circularly polarized microstrip antenna; radio frequency identification applications; self-similar structure; Fractals; Gain; Microstrip; Microstrip antennas; Radiofrequency identification; Shape;
Conference_Titel :
Applied Electromagnetics Conference (AEMC), 2013 IEEE
Conference_Location :
Bhubaneswar
Print_ISBN :
978-1-4799-3266-5
DOI :
10.1109/AEMC.2013.7045093
