Design of a Planar Frequency Doubler with Schottky Diodes at Terahertz Band

We present a design method of planar terahertz frequency doubler in this paper. The frequency doubler includes a single compact micro-strip resonant cell, a diode chipset, two output open stubs, a bias circuit, the input matching circuit and the output matching circuit. The matching circuits are optimized to achieve maximum output power. Finally, a 124 GHz frequency doubler is designed according to the presented method. The output power is higher than 10 d Bm with 15% to 17.8% conversion efficiency.