[12a-B414-1~10] 3.9 Terahertz technologies

▲ [12a-B414-9] Impedance matching method in high-power RTD THz oscillator integrated with rectangular-cavity resonator

〇(M2)Feifan Han¹, Kazunori Kobayashi¹, Hiroki Tanaka¹, Safumi Suzuki¹, Masahiro Asada¹ (1.Tokyo Tech)

Keywords:Terahertz, Resonant tunneling diode

Oscillators using resonant tunneling diodes (RTDs) are major candidates for THz wave sources, because of their operation at room temperature and compactness. Although we achieved a high power oscillation of around 0.7 mW by an arrayed RTD oscillator, the output power of single RTD oscillator is relatively small, in the order of 10 μW around 1 THz. For higher output power, novel RTD THz oscillators with cavity resonators and bow-tie antennas was proposed. In this work, we propose and simulate an impedance matching method between RTD and antenna in the novel oscillator to extract maximum output power from RTD. We analyzed the admittance of cavity resonator and antenna using 3D electromagnetic simulation, and established an equivalent circuit model for this structure. The radiated output power can be estimated by calculating power consumption at the antenna. According to the experiment result, a control of antenna impedance is required to extract the maximum output power from RTD with an impedance matching between antenna and RTD through the MIM capacitor. As a result, a relatively high output power of ~2 mW can be achieved at around 1 THz with an optimum MIM capacitor of ~50 fF.