Surface micro-machined wideband circularly polarized antenna array for 60GHz radios

A 60GHz wideband circularly polarized E-shaped patch antenna array is designed using surface micromachining. The E-shaped patch is fully utilized to obtain good circular polarization performance. The antenna array is excited by four-way power divider. The four-way power divider is designed using rectangular micro-coaxial transmission line. The antenna array with the specified size of 12.5mm×5.7mm×0.62mm and bandwidth shows around 8GHz (59~67GHz) under the condition of voltage standing wave ratio (VSWR) less than 2, axial-ratio bandwidth was 11.1% (58.6~65.5 GHz), respectively. Gain of the antenna array is up to 13.3 dBi gain at 63GHz, and the efficiency is 90%.