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In this work, a graphene-based single-stage high-order subharmonic mixer is presented. The device is able to up- and downconvert a signal in the 330–500 GHz frequency range, using a local oscillator signal with frequency located in the 26–40 GHz band. It exploits the strong nonlinear electromagnetic behavior exhibited by macroscopic graphene sheets when they are exposed to an incident electromagnetic wave to generate the output signal as a mixing product between the input signal and a high-order harmonic component of the local oscillator, which is internally generated without requiring additional circuitry. A prototype was implemented and its performance was experimentally characterized considering several different local oscillator multiplication orders. The maximum measured downconversion gain is around −50 dB, whereas the maximum output signal reached when working as upconverter is −43 dBm at 340 GHz and −63 dBm at 480 GHz. These values are good enough to be used in practical short-range applications. Furthermore, the measurement results are in good agreement with the theoretical predictions about graphene behavior.

330-500 GHz Graphene-Based Single-Stage High-Order Subharmonic Mixer