A planar antenna array with wide frequency band and wide end-fire beam

A planar antenna array with wide frequency band and wide end-fire radiation beam is proposed in this letter. The antenna element is composed of periodic structure, and its feeding position deviates from the center of symmetry, so end-fire radiation is obtained. The measurement results show that the antenna array operates in the frequency range of 6.11-10.38 GHz with voltage standing wave ratio less than 2, and the corresponding impedance bandwidth is 51.7%. It exhibits a wide radiation beam of more than 80 degrees at end-fire direction and achieves realized gain of more than 8 dB in measured band.