A compact wideband filtering quasi-yagi antenna

A compact wideband filtering quasi-Yagi antenna is presented. To realize differential driven on the dipole, exciting signals are transited from the microstrip to the coplanar stripline by utilizing the truncated ground plane and the shorting via hole. Next, for the implementation of the filtering response, a compact resonator is introduced. To validate our proposal, a quasi-Yagi antenna operating at 6.0 GHz with a bandwidth of 26.7% is designed, fabricated, and measured. Results indicate that the proposed antenna operates from 5.5 to 7.1 GHz, and the measured average gain in the passband is about 4.0 dBi at end-fire direction with high selectivity in the passband edge. In addition, the range of suppression on harmonics is more than the second harmonic.