A Wideband Phased Antenna Array Based on Tapered Cavities in Triangular Lattice Arrangement

Abstract

In this paper, a wideband phased antenna array based on tapered cavities in a triangular lattice is investigated. The antenna consists of a tapered cavity, a metal feeding patch and four parasitic strips. The open ending of the feeding patch is put on top of the tapered cavity and the other ending is connected to a coaxial connector. Four strips are etched on the upper substrate for wide-angle impedance matching. For the triangular lattice arrangement, a large element spacing is allowed. The element spacing is $0.52\lambda_{0}$ in E-plane and $0.53\lambda_{0}$ in H-plane, where $\lambda_{0}$ , is the free-space wavelength at the center frequency. The overall height of the unit cell is $0.19\lambda_{0}$ . The simulation results of the infinite antenna array show that it can achieve 55.4% bandwidth with active VSWR $ for the broadside radiation case. The antenna array can scan up to $\pm 60^{\circ}$ in E-plane and $\pm 20^{\circ}$ in H-plane limited by the condition of active VSWR $ .