Millimeter-wave microstrip antenna arrays with waveguide feed network

A major restriction of high gain microstrip antenna arrays is found in thei r high losses, mainly due to the feeding network. In this contribution, des ign and results of three different microstrip array antennas with a low-los s waveguide feed network are presented, Interconnects between planar struct ures and waveguide network are done by slot coupling. The waveguide network for these test antennas was machined from aluminum, but in a later phase, it might be fabricated using plastic injection molding and electroplating t o realize low-loss, low-cost planar mm-wave antennas.