Design and Fabrication of W-Band Waveguide Slotted Array Antenna Based on Milling Process

摘要

A single-layer waveguide slotted array antenna is proposed for W-band applications. To eliminate the alignment errors, all structures including the radiation slots, radiation waveguides, and power divider network are realized in one layer based on the milling process, and a planar metal plate is employed to cover the bottom. For example, an 8?×?9 array is designed with 1-to-8 power divider network to validate the proposed technology. The effective radiation aperture size of the array is 24?mm?×?21?mm, and the height is only 8?mm. The measured reflection coefficient of the antenna is larger than 3?GHz for S11???10?dB. The peak gain is 25.9?dBi, and the corresponding antenna efficiency is about 65%. All cross-polarization of the antenna array is less than ?35?dB. The proposed array antenna features a simple structure, low cost, and easy implementation for W-band applications.