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http://dx.doi.org/10.4218/etrij.15.0114.0637

Bandwidth Enhancement of Circularly Polarized Dielectric Resonator Antenna  

Sun, Ru-Ying (Department of Electrical Engineering, the School of Automobile Engineering, Linyi University)
Publication Information
ETRI Journal / v.37, no.1, 2015 , pp. 26-31 More about this Journal
Abstract
Axial-ratio (AR) bandwidth enhancement is achieved for a circularly polarized (CP) cylindrical dielectric resonator antenna (DRA) using a wideband hybrid coupler (WHC) combined with dual probe feed. The presented WHC, comprised of a Wilkinson power divider and a wideband $90^{\circ}$ shifter, delivers good characteristics in terms of 3 dB power splitting and consistent $90^{\circ}$ (${\pm}5^{\circ}$) phase shifting over a wide bandwidth. In turn, the proposed CP DRA, for the employment of the WHC, in place of conventional designs, provides a significant enhancement on AR bandwidth and impedance matching. The antenna prototype with the WHC exhibits a 3 dB AR bandwidth of 48.66%, an impedance bandwidth of 52.5% for voltage standing wave ratio (VSWR) ${\leq}2$, and a bandwidth of 44.66% for a gain of no less than 3 dBi. Experiments demonstrate that the proposed WHC is suitable for broadband CP DRA design.
Keywords
Circularly polarized antenna; dielectric resonator antenna; wideband hybrid coupler; axial ratio bandwidth;
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Times Cited By KSCI : 1  (Citation Analysis)
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