Half-mode dielectric waveguide antenna fed by a micro-strip line with air media for endfire radiation

摘要

A half-mode dielectric waveguide antenna fed by a micro-strip line with air media is presented. The proposed antenna consists of two dielectric cuboids and an air-substrate micro-strip line. Due to similar modal field configurations, the dielectric cuboids are excited effectively by the micro-strip line, and they work as two half-mode waveguide antennas working on the TM0 mode. With the length of 6.5 wavelength at the centre frequency of 5 GHz, a measured endfire gain of 12.2 dBi is achieved. The measured 1 and 3-dB gain bandwidths could reach 17 and 46%, respectively. Good matching is obtained over the entire operating band from 3.5 to 6.5 GHz. Compared with the antennas mounted on a large conducting plane, the proposed antenna has the advantages of a high endfire gain, a wide endfire gain bandwidth, and a stable endfire radiation pattern.