Multilayer Rotman lens fed antenna array for system packaging

The millimeter-wave applications attract more research due to the advance of microelectronics at higher frequencies. They have beneficial aspects such as compact size and wide bandwidth, which are favorable for both communications and radars. In many applications, a beamformer is required to generate beams that are manipulated. At the system level, electronic packaging technology is driving towards packing more components in limited space to facilitate the design of compact systems. The packaging technology is focused on MMIC package, system-inpackage (SiP), and system-on-package (SoP) [1]. Of particular interest in this research is how to design the lens to pack into system package. In this paper, two types of multilayer lenses have been presented. One is a two layer Rotman lens antennas and the other is a three layer asymmetrical feeding Rotman lens.