A New type of 0.34THz Sine Waveguide Slow Wave Structure

A new type sine waveguide slow wave structure (SWS) is proposed in this paper considering fabrication feasibility. Unlike the conventional sine waveguide SWS, a round beam tunnel is adopted in this modified structure. The simulation results show that the new structure have the advantages of wide bandwidth and low loss which are important in millimeter-wave and THz TWT. A 3dB bandwidth of 25 GHz and a maximum gain of 27 dB were predicted by PIC simulation for a 40 mm-long slow wave circuit.