Phase Cancellation for Signal Decoupling Between Overlapped RF Paths

This paper explains the method to reduce the signal coupling between two overlapped RF paths by applying phase cancellation. When two RF paths cross over each other, how the signal transmits in the decoupling circuit is described, and the phase variation of the E-field vectors at different stages is presented with relevant amplitudes. For demonstration, a prototype in K-band is constructed based on rectangular waveguides, and fabrication is conducted by using additive manufacturing and electroplating technologies. The measurement is consistent with the simulation.