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A compact microstrip-fed quasi-Yagi antenna using stepped-width resonator is investigated. Analysis for the stepped-width dipole is outlined. In comparison to the conventional one using a uniform-width dipole, the proposed antenna shows a 20% size reduction. Furthermore, the proposed antenna has a lower mutual coupling. The proposed antenna achieves a measured 28% fractional bandwidth with a return...
A planar microstrip-coplanar stripline-fed Yagi-Uda antenna is presented. The antenna consists of a microstrip line to coplanar stripline transition, a reflector, a coplanar stripline-fed driver dipole, and three directors. The measured 10-dB bandwidth is 1% at the center frequency of 10 GHz. The antenna achieves a high 10.5 dBi gain and a 15-dB front-to-back ratio. Furthermore, the cross-polarization...
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