Broadband 60-GHz beam-steering vertical off-center dipole antennas in LTCC

Broadband 60-GHz vertical off-center dipole antenna and its arrays in low-temperature co-fired ceramic (LTCC) substrate are presented in this paper. The dipole antenna is designed using the off-center-fed technology to improve its bandwidth to cover the 60-GHz frequency band from 57 GHz to 66 GHz. A 4×4 planar array is optimized to achieve a maximum gain of 15.6 dBi at 60 GHz, while a beam-steering array using a low-cost Butler matrix is optimized to give a 5-dB measured beamwidth wider than 80° at 60 GHz. Measured results verified our prediction.