70-GHz band corporate-feed array antenna with multi-layered glass substrate

In this paper, a corporate-feed array antenna with multi-layered glass substrate operating at 70-GHz band is proposed. The array antenna has slot and microstrip radiation elements with post-wall waveguide corporate-feeding circuit. The feeding circuit and radiation elements are fabricated on separated glass substrates which are connected by diffusion bonding for Cu. Reasonable agreement in both reflection and radiation characteristics between simulated and measured results is obtained. Frequency independent beam direction is also observed so that the proposed antenna is suitable for 70-GHz band applications.