Microstrip slot antenna array in LTCC technology for a 122 GHz system-in-package

A 2×2 array of microstrip slot antennas with a resonating cavity created by a via-fence is presented. The array is manufactured in Low Temperature Co-fired Ceramic (LTCC) technology using Ferro A6-S tapes. Measurement results of a prototype are given and compared to simulations. The antenna can be integrated into a Ball-Grid-Array Package with a MMIC.