Design of Ultra-Wide Bandwidth Printed Quasi-Yagi Antenna with Semi-Elliptical Monopole Driver

This paper presents a new configuration of printed quasi-Yagi antenna fed by semi-elliptical monopole for ultra-wide bandwidth. The elements of PQYA are modified using a semielliptical monopole as a driven element, a half bow-tie shaped truncated ground reflector, and elliptical director elements. Consequently, the operating band of 1.65-6 GHz is achieved with a simple feed structure. The proposed PQYA possesses not only the advantage of 114% ultra-wide bandwidth but also a compact size of 55 × 55 × 1.6 mm
₃
. The prototype is fabricated on a low-cost FR4 substrate and tested. The measurement results show that it has a peak gain of 6.9 dBi and a stable end-fire radiation pattern over entire impedance bandwidth with the front-to-back ratio, and cross-polarization levels better than 9.2 dB and 20 dB, respectively.