A 0.28 THz Super-Harmonic Self-Injection-Locked Radar for Vibration Sensing and Phase Imaging

0 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE microwave and wireless technology letters Pub Date : 2025-02-21 DOI:10.1109/LMWT.2025.3542319

Wei Sun;Sidharth Thomas;Aydin Babakhani

引用次数: 0

Abstract

This letter presents a continuous-wave (CW) radar for micrometer-level phase and vibration detection based on super-harmonic self-injection locking in a free-running oscillator. The radar system consists of an oscillator that radiates a signal which gets reflected off a target. The reflected signal is re-injected into the oscillator. Due to super-harmoinc self-injection-locked (SSIL), this causes a frequency shift dependent on the target distance, enabling precise ranging. The proposed radar is implemented using a 140 GHz oscillator followed by an efficient medium-breakdown HBT-based doubler and on-chip antenna. The doubler achieves a peak EIRP of +25.3 and −0.1 dBm radiated power at 281 GHz and consumes 144 mW dc power (dc-to-THz efficiency of 0.68%). In SSIL radar operation, a frequency shift of 250 MHz is observed. Using the proposed radar, we demonstrate: 1) detection of sub-

$30~\mu $

m vibrations and 2) reflection-based phase imaging.

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用于振动传感和相位成像的0.28太赫兹超谐波自注入锁定雷达

这封信介绍了一种基于自由运行振荡器超谐波自注入锁定的连续波（CW）雷达，用于微米级相位和振动检测。该雷达系统由一个振荡器组成，振荡器辐射信号，信号被目标反射。反射信号被重新注入振荡器。由于超高频自注入锁定（SSIL），这会导致与目标距离相关的频率偏移，从而实现精确测距。拟议的雷达采用 140 GHz 振荡器，然后是基于 HBT 的高效中压倍增器和片上天线。倍增器在 281 GHz 频率下实现了 +25.3 和 -0.1 dBm 的峰值 EIRP 辐射功率，消耗 144 mW dc 功率（dc-to-THz 效率为 0.68%）。在 SSIL 雷达工作时，可观察到 250 MHz 的频率偏移。我们利用拟议的雷达演示了1) 亚 30~\mu $ m 振动的探测；2) 基于反射的相位成像。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE microwave and wireless technology letters

CiteScore

6.00

自引率

0.00%

发文量