Design of Planar Filtering Quasi-Yagi Antenna

A design of planar filtering quasi-Yagi antenna is investigated in this paper. The antenna is designed using the codesign of bandpass filter (BPF) and antenna. Two halfwavelength resonators are utilized to feed the half-wavelength driven dipole. Three parasitic strips are utilized as the director, and the ground plane acts as the reflector of the Yagi antenna. The simulated results show a good filtering gain response, with a wide bandwidth of 14% (from 3.07 GHz to 3.53 GHz), and a peak gain of 6 dBi. This antenna has a radiation null on the lower side of the passband, improving the frequency selectivity. Compared with other quasi-Yagi antennas, this structure can achieve compact size and high selectivity.