Abstract
A compact wideband planar double-sided printed quasi-Yagi antenna is presented. This paper focuses on the feasibility of substituting conventional balun for microstrip-to-slotline transition balun to achieve wider bandwidth and relatively smaller size. The proposed antenna, consisting of a feeding balun, a concave arc-shaped reflector, a modified driver with stacked structure and two directors, is designed and fabricated. Good agreement between simulated and measured results is observed. Simulation and measurement results reveal that the proposed antenna can provide an impedance bandwidth of nearly 100% (2.02-6.05 GHz). Additionally, within the impedance bandwidth, the radiation pattern of the proposed antenna has front-to-back (F/B) ratios ranging from 10.1 dB to 19.1 dB, cross-polarization levels in the main radiation direction from 19.8 dB to 36.2 dB and gains from 3.4 dBi to 7.4 dBi.
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