Flip-Chip Interconnection Effects on 60-GHz Microstrip Antenna Performance

In this letter, we investigate the effects of flip-chip interconnection on microstrip antenna performance. In particular, we explore the relationship of the flip-chip interconnection parameters to the bandwidth, radiation efficiency, and gain. It is shown that microstrip antenna bandwidths of 15% can be achieved with careful flip-chip interconnection design and fabrication. This study is of particular importance at 60 GHz for the integration of millimeter-wave antennas into the package.