A High Efficiency 0.2THz Doubler

This paper proposes a high efficiency doubler with a frequency range of 210 GHz to 230 GHz. The frequency doubler uses ACST planar GaAs schottky diodes. The balanced circuit topology and 50um thick quartz substrate are used. On the basis of the traditional balanced doubler circuit topology, reduce the order of the dc bias low-pass filter, thereby greatly reducing the quartz substrate aspect ratio. This can effectively avoid substrate warpage caused by excessive substrate aspect ratio. The simulation results show that the efficiency is greater than 12% in the frequency range of 210GHz-230GHz with the input power of 100mW, and the peak efficiency at 221GHz is 31%. The doubler requires only small input power due to its high efficiency characteristic when used as one stage of local oscillator chain of terahertz subharmonic mixer.