60-GHz wideband branchline coupler and patch antenna with dielectric rod for full-duplex gigabit wireless communication

Abstract

An improved design of the patch antenna with the dielectric rod is proposed. The wideband branchline coupler and wideband patch antenna are designed and optimized to realize a high port-to-port isolation for the whole 60-GHz ISM frequency band. In this paper, the design of the improved dielectric rod antenna is explained. The achieved gain of the antenna system is around 13.5 dBi, and the antenna supports dual circular polarization for bi-directional communication while promotes rotational freedom. The achieved port-to-port isolation larger than 20 dB is obtained for the bandwidth of 7 GHz, which is a significant improvement from the author's previous design. The measured axial ratio in the bandwidth of interest is below 3 dB.

Dielectric Rod Antenna Array With Planar Folded Slot Antenna Excitation

“…The individual element gain simulated in HFSS is 16.5 dBi. According to (6), the theoretical array gain for this 4 element array is 22 dBi. When calculated from array theory by pattern multiplication of the simulated individual element pattern with the array factor, the gain is 21 dBi.…”

“…DRAs have been used in radar antenna arrays [1] - [3], millimeter-wave imaging [4], and other applications [5], [6]. The feed mechanisms for the dielectric rods typically include some form of a metallic waveguide for support or for setting up the modes necessary for launching a surface wave along the rod.…”

“…A DRA to DRA, on-chip communication system uses dielectric rod waveguide-fed DRAs [25]. Other planar-integrated DRAs have been fed without hollow metallic waveguides including those fed with an edge-fed design using antipodal Vivaldi antennas [5], a stacked patch [6], and direct contact between the DRA and a ring-slot [26]. Rivera-Lavado et al [27], [28] demonstrate THz DRAs fed by integration of the dielectric rod with a planar, linearly polarized log-periodic radiator.…”