Integrated Butler Matrix and $1\times 4$ Antenna Array for Board-to-Board Communication in the mmWave-range

An integrated butler matrix with a 1×4 antenna array consisting of log-spiral antenna elements is presented. The design is taped-out in a state-of-the-art indium phosphide technology of Teledyne. By the implementation of the butler matrix as a passive phase shifting element, the whole system enables beam-steering capabilities in the frequency range from 165 GHz to 195 GHz. Therefore, this system allows the design of adaptive and energy-efficient wireless links for board-to-board communication in the mmW-range.