A W ‐band monolithic broadwidth frequency multiplier on millimeter S chottky diode and metamaterial

A millimeter GaAs‐based planar Schottky varactor diode and corresponding equivalent large signal circuit model have been successfully developed to design and fabricate a W‐band broadwidth monolithic frequency multiplier based on 5‐unit composite left/right handed nonlinear transmission lines. The small signal and large signal characteristics of the frequency multiplier are numerically analyzed and discussed in detail. The frequency multiplier shows a large second harmonic bandwidth due to the anomalous dispersion determined by the structure parameters of the left‐handed nonlinear metamaterial. The measured maximum output power of the second harmonic of 77.6 GHz is 6.7 dBm in the frequency range from 75 to 80 GHz is obtained when a 20‐dBm fundamental signal of 38.8 GHz is fed to the frequency multiplier biased at 0 V. It is demonstrated experimentally and numerically, the possibility to apply composite left/right handed nonlinear transmission lines to generate W‐band or higher millimeter‐wave frequency signal source by frequency multiplication. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:525–530, 2015