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A NOVEL DESIGN OF FOLDED DIPOLE FOR BROADBAND PRINTED YAGI-UDA ANTENNA

By Z. Wang, X. L. Liu, Y.-Z. Yin, J. H. Wang, and Z. Li

Full Article PDF (648 KB)

Abstract:
In this paper, a printed wideband Yagi-Uda antenna with a novel folded dipole driver is proposed. The folded dipole driver is comprised of a folded dipole and a microstrip feedline which functions as an internal balun to mainly determine its wide impedance bandwidth. With the optimized parameters, an operating band of 1.69 GHz~2.72 GHz can be obtained. Besides the folded dipole driver, the broadband printed Yagi-Uda antenna also consists of three directors and a reflector. Its wideband performance is mainly determined by the folded dipole driver, while the reflector and directors improve its performance slightly. By optimizing the geometrical parameters of the folded dipole driver, a bandwidth of 61.8% (1.53 GHz~2.93 GHz) for return loss being higher than 10 dB is achieved. The proposed printed Yagi-Uda antenna is realized on FR4 substrate with a measured operating bandwidth of 62% (1.51 GHz~2.94 GHz), a flat gain (5.6 dB~7.3 dB), more than 10dB front-to-back ratio and lower than -15 dB cross-polarization level.

Citation:
Z. Wang, X. L. Liu, Y.-Z. Yin, J. H. Wang, and Z. Li, "A Novel Design of Folded Dipole for Broadband Printed Yagi-Uda Antenna," Progress In Electromagnetics Research C, Vol. 46, 23-30, 2014.
doi:10.2528/PIERC13111803

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