Narrow-beam azimuthally omni-directional millimetre-wave antenna using freeformed cylindrical woodpile cavity

摘要

A freeformed cylindrical electromagnetic bandgap (EBG) structure and its application for millimetrewave antennas are presented. The cylindrical EBG structure is fabricated using the extrusion freeforming technique in which the design is downloaded directly to a building platform. The fabricated cylindrical woodpile exhibits bandgap characteristics around 95 GHz and is used for realising a resonant cavity antenna. The fabricated antenna achieves a narrow beam with 6.5u000b0; measured half-power beam-width in the elevation plane without using an array configuration. The overall antenna gain is approximately 5 dBi at 94.2 GHz, suitable for future short-range gigabit wireless communications