We propose a two-dimensional (2D) resonant-tunneling-diode (RTD) oscillator array to generate quasi-plane terahertz (THz) waves. Dual-RTD slot antennas are employed to form the 2D array meshes, where adjacent RTDs are arranged in a reverse configuration to enhance power-combination through anti-phase coupling. Expansive metal pads are introduced to redirect the electric fields, mitigating electric field cancellation and leading to improved radiation efficiency. The 2×2 2D RTD array achieves milliwatt level output power terahertz radiation, exhibiting improved directivity. Moreover, this work demonstrates that further expansion of array elements holds the potential to enable high-power terahertz radiation with a quasi-plane wavefront.
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Tang et al. (2024) studied this question.
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