Design of Sub-Millimeter Wave Integrated Planar Diplexer

High speed and large bandwidth with carrier frequencies higher than 100GHz are attractive for next-generation satellite communication and radar payload applications. The abundant spectrum resources in D-band could be leveraged for high-resolution sensing and high data rate transmission. In this paper, a novel design of a D-band integrated low-loss planar duplexer is proposed, which overcomes the problem of the sharp increase of plane circuit loss caused by a high-frequency band. Furthermore, compared with CNC machined waveguide devices, the volume, and weight are reduced by tens of times. Simulation results show that using the micro-machined or micro-3D printing technology, the D-band duplexer could be integrated into the sub-millimeter system, which presents a good application prospect in the space industry.