Broadband terahertz time-domain spectroscopy and fast FMCW imaging: Principle and applications
Shen Yao-Chun, Yang Xing-Yu, Zhang Zi-Jian
       

(a) Photograph of the FMCW radar chip together with its transmitter antenna (TX) and receiver antenna (RX). (b) Schematic diagram of integrated THz and FMCW antennas. Note that the THz antenna and FMCW antennas are on the different sides of the GaAs substrate, thus minimizing possible interference between THz and FMCW measurements.