We present optimisation results for the symmetrical-slot-antenna resonant-tunnelling-diode (RTD) oscillators with account of relevant antenna losses and RTD parasitics. The results are in good agreement with available experimental data. The frequency roll-off of the output power has a complicated dependence on the oscillator parameters and does not exhibit a distinct dominant mechanism responsible for it. However, the roll-off is much steeper for lower-current-density RTDs, with much better performance of high-current-density RTDs not only at THz but also at sub-THz frequencies. The required minimum RTD-mesa area for optimised oscillators remains in an acceptable range for common fabrication technology: <tex-math notation="LaTeX">≈ 0.1-0.2\,μ</tex-math> m <tex-math notation="LaTeX">²</tex-math> .
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Picco et al. (2024) studied this question.
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