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Circularly Polarized Bandwidth-Enhanced Crossed Dipole Antenna with a Simple Single Parasitic Element


Huy Hung Tran, Ikmo Park and Truong Khang Nguyen*

Source title: 
IEEE Antennas and Wireless Propagation Letters, 16(1): 1776-1779, 2017 (ISI)
Academic year of acceptance: 

A method of using a simple single parasitic element to significantly enhance a 3-dB axial-ratio (AR) bandwidth of a crossed dipole antenna is presented. This approach is verified by introducing one bowtie-shaped parasitic element between two arms of crossed bowtie dipoles to generate additional resonance and thereby significantly broadening AR bandwidth. The final design, with an overall size of 0.79 λo × 0.79 λo × 0.27 λoo is the free-space wavelength of circular polarized center frequency), resulted in very large measured -10-dB impedance and 3-dB AR bandwidths ranging from 1.9 to 3.9 GHz (~68.9%) and from 2.05 to 3.75 GHz (~58.6%), respectively. In addition, the antenna also yielded a right-hand circular polarization with stable far-field radiation patterns and an average broadside gain of approximately 8.2 dBic.