Design of single-ended CPW to rectangular waveguide transition on InP at 300 GHz for 5G applications

Abstract In this paper, we present the development of coplanar waveguide to rectangular waveguide (CPW-WG) transition for broadband millimetre wave applications. The traditional approach for interfacing of components in pure electronics is not possible to implement in micorwave photonics at high frequency range due to some limitations like rigidity and increased loss. In order to overcome this problem, transition structures are usually designed within the waveguide model through split block mechanism. The models developed so far are complex with minimum space of interconnects and less stable due to vertical placement of waveguide. The waveguide structure proposed in this paper is placed along horizontal direction due to which stability of structure is increased and has more space for interconnects. The transition model is designed using indium phosphide (InP) to increase the efficiency and reduce the propagation loss at high frequency range. The simulated design can operate over a bandwidth of 14 GHz with a return loss of 10 dB.