A Wide-Angle Scanning Array Antenna Based On a Shared-Aperture Element

In this paper, a dual band shared-aperture antenna is proposed. The proposed element is composed of a stacked microstrip antenna and a corner_cut microstrip antenna. The stacked microstrip antenna operates at lower band and a metal cavity is loaded around the antenna to improve the scanning capacity. The corner_cut microstrip antenna operates at higher band and a SIW-cavity is established by the surrounding metallized plated-through holes to obstruct the surface waves and achieve beam steering in a wide-angle coverage. The simulated results show that the proposed array antenna can achieve a
$\pm 70^{\circ}$
beam scanning and a
$\pm 60^{\circ}$
beam scanning for lower band and higher band respectively.