WIDEBAND QUASI-YAGI ANTENNA FED BY MICROSTRIP-TO-SLOTLINE TRANSITION

摘要

This letter presents a wideband quasi-Yagi antenna fed by a microstrip-to-slotline transition. The transition consists of a microstrip radial stub and slot radial stub, both at 90° but with different radii, to achieve wideband impedance matching. The antenna has a measured fractional bandwidth of approximately 46% (4.64-7.42 GHz) for a -10 dB reflection coefficient and a flat gain of 6.0-6.75 dBi with a front-to-back ratio and cross-polarization level better than 17 and -15 dB, respectively, across the bandwidth.