Broadband cavity-backed antenna arrays on glass substrate for 60 GHz application

In this paper design concepts for compact broadband printed V-Band 2×1 bowtie, 2×1 and 2×2 dipole array antennas, suitable for millimeter wave (mm-Wave) applications, are presented. The antennas are designed on a planar quartz glass substrate. The center frequencies of the array antennas are set to 60 GHz. Optimization techniques for improving antennas impedance matching and overall gain are also presented. Simulated and measured impedance matching and far field radiation patterns for all three antenna arrays are shown and discussed. An air cavity has been embedded in the quartz glass stack to improve antenna bandwidth and radiation efficiency. Both dipole structures have about 8.5 dBi measured gain, while the bowtie antenna shows 7 dBi. Their bandwidth is about 10 GHz. All three designs achieve over 10 % bandwidth while maintaining better than 90 % efficiency. A prototype of the antennas was successfully manufactured and tested.