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A planar Yagi-Uda antenna with a single director, a meandered driven dipole, and a concave parabolic reflector on a thin dielectric substrate is proposed. Through this design, the high directivity of 7.3 dBi, front-to-back ratio of 14.7 dB, cross-polarization level of -39.1 dB, bandwidth of 5.8%, and the radiation efficiency of 87.5%, which is better than -1 dBi in terms of the 3D average gain, can...
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