Design of a Novel D-Band Frequency Doubler

A D-band frequency doubler with resistive diodes is presented.A novel double finline input transition is designed to get better match of input waveguide with diodes,which has been successfully applied to this doubler.Commercial GaAs Schottky diodes MA4E2038 are employed.The doubler circuit is fabricated on 0.05mm thick quartz.Simulated results show that the highest conversions efficiency of 10.3% is obtained at 146.8 GHz.Practical highest conversion efficiency of 2.3% is measured at 148GHz when circuit is self-biased and maximum measured output power of 1.1mW at 154GHz when biased at 0.7V.The output power is high enough for most application,and the novel doubler could provide reference for communication system at 140GHz.