350-GHz-Band 4 by 4 RTD Monostatic Radar Array for Sequential Multidirectional Ranging
Abstract
Terahertz (THz) sensing offers significant potential for nondestructive evaluation, imaging, and metrology, but the cost and complexity of existing systems remain barriers to practical deployment. This letter presents a compact 4 by 4 monostatic radar array based on a single-RTD-per-pixel architecture, in which each resonant tunneling diode (RTD) functions as both a bias-tunable oscillator and a self-mixing detector. The RTD elements are sequentially addressed through a low-frequency switching network and share the same baseband control and readout electronics. A shared 3D-printed dielectric lens maps the RTD elements to spatially separated sensing directions. We experimentally verify the operation of all array elements and demonstrate sequential multidirectional ranging using four selected elements, followed by preliminary 16-pixel THz imaging. By combining self-mixing at each pixel with low-frequency selection and shared optics, the array avoids a separate THz receiver chain for each pixel and provides a compact architecture for electronically addressable THz sensing and imaging.
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BibTeX
@misc{yi2026350ghzband,
title = {{350-GHz-Band 4 by 4 RTD Monostatic Radar Array for Sequential Multidirectional Ranging}},
author = {Li Yi and Ryoma Nakamura and Shota Ito and Yousuke Nishida and Koji Terumoto and Toshihisa Maeda and Bryce Chung and Yunbin Jiang and Daniel Headland},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.18478},
eprint = {2609.18478},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.18478},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - 350-GHz-Band 4 by 4 RTD Monostatic Radar Array for Sequential Multidirectional Ranging
AU - Li Yi
AU - Ryoma Nakamura
AU - Shota Ito
AU - Yousuke Nishida
AU - Koji Terumoto
AU - Toshihisa Maeda
AU - Bryce Chung
AU - Yunbin Jiang
AU - Daniel Headland
PY - 2026
DA - 2026/09/16
PB - arXiv
DO - 10.48550/arxiv.2609.18478
UR - https://arxiv.org/abs/2609.18478
AB - Terahertz (THz) sensing offers significant potential for nondestructive evaluation, imaging, and metrology, but the cost and complexity of existing systems remain barriers to practical deployment. This letter presents a compact 4 by 4 monostatic radar array based on a single-RTD-per-pixel architecture, in which each resonant tunneling diode (RTD) functions as both a bias-tunable oscillator and a self-mixing detector. The RTD elements are sequentially addressed through a low-frequency switching network and share the same baseband control and readout electronics. A shared 3D-printed dielectric lens maps the RTD elements to spatially separated sensing directions. We experimentally verify the operation of all array elements and demonstrate sequential multidirectional ranging using four selected elements, followed by preliminary 16-pixel THz imaging. By combining self-mixing at each pixel with low-frequency selection and shared optics, the array avoids a separate THz receiver chain for each pixel and provides a compact architecture for electronically addressable THz sensing and imaging.
ER -