60-GHz broadband folded dipole array

Nowadays antennas operated in V-band receive more and more attention as communication technology develops. Progress in material engineering opens a wide window for high frequency applications. In this paper, a broadband folded dipole antenna array is first presented, which has a magnitude of S11 lower than -10 dB over the range between 48 GHz and 64 GHz, an efficiency of 90 percent and a gain of 10 dBi. A novel configuration with a superstrate and two separate grounds is taken for improving the performance. Flip-chip connection is used between the integrated circuit carrier and the antenna attached to the superstrate.