A Composite Antenna Comprising Conical-Beam Slotted Cavity and Patch Antennas

Abstract

A composite antenna consisting of patch and slotted cavity antennas based on substrate integrated waveguide (SIW) is proposed in this paper. TM020 mode is simply excited by a coaxial probe located at the center of the cavity. Energy is coupled out of the cavity by six symmetric curved slots etched in the top metal layer. Thus, a conical-beam radiation pattern with horizontal linear polarization is obtained from 25.37 to 33.1 GHz $(\vert \mathrm{S}_{11}\vert < - {10}$ dB). In addition, a patch antenna operating from 5.06 to 5.30 GHz (VSWR < 2) is achieved when the slotted cavity is excited from the bottom metal layer. The reflector of the slotted cavity antenna is reused as the ground of the patch antenna. This composite antenna can be applied for future 5 G wireless communication.