Compact Microstrip Line to Rectangular Waveguide Transition Using Corrugated Substrate Integrated Waveguide

To meet the packaging requirements of terahertz (THz) communication systems, a microstrip line (MSL) to rectangular waveguide (RWG) transition is proposed in this paper. In transition, MSL connected corrugated substrate integrated (CSIW) by tapered for quasi-TEM TE10-like mode conversion on substrate, which requires no via holes or shaped dielectric, and easy process THz bands. Then, CSIW straightly RWG transformer converted standard RWG, resulting compact structure. The working principle analyzed, influence several important parameters S-parameters discussed. A single designed 325–500 GHz operation, S11 better than −14.5 dB S21 −1.03 have been achieved entire frequency band.