Increment in output power of resonant-tunneling-diode terahertz oscillator with long-cavity resonator

We theoretically investigated the cavity-length dependence on the output power in the resonant-tunneling-diode terahertz oscillator integrated with rectangular cavity resonator. We utilized an electromagnetic simulation for estimation of antenna and resonator admittances. High output powers of around 2 mW at 1 THz and 3 mW at 0.7 THz are expected from a single resonant-tunneling-diode oscillator with 20-μm-long cavity resonator.