Two-Dimensional Resonant-Tunneling - Diode Oscillator Array for Quasi-Plane Terahertz Radiation

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.