Limit of oscillation frequency in two-element slot-ring type RTD oscillator array

We proposed and analyzed a two-element RTD oscillator array with a simplified structure. The device comprises two RTD mesas integrated with a slot-ring antenna and coupled by a resistor. Our analysis shows that the limit of oscillation frequency is equivalent to that of conventional oscillators. Furthermore, we successfully fabricated the RTD oscillator array and achieved an oscillation frequency of up to 1.36 THz.