Triple-band Hexagonal Loop Antenna with Capability of Beam Switching

There is an ever-increasing demand for multibeam and multi-band antenna systems. In this paper, a novel triple-band hexagonal loop antenna with capability of beam switching is designed. By properly designing the length and width of the hexagonal patch and the positions of the four feeding ports, the hexagonal loop antenna can work in three frequency bands with bandwidths of 3.80% (2.33-2.42 GHz), 3.32% (3.26-3.37 GHz) and 8.71% (4.25 - 4.64 GHz) respectively. The measured gains at resonant frequencies of 2.37, 3.31, and 4.48 GHz are about 6.08, 6.77 and 5.81 dBi, respectively. Furthermore, the hexagonal loop antenna can switch the beam in four quadrants by exciting different ports individually when working in the third band, which is applicable to smart communication systems.