Amplitude and Phase Measurements of Scattered Fields for Quantitative Imaging in the W-band

This communication investigates a bi-static scattering measurement system for mm-Wave imaging purposes in the W-band (75-110 GHz). The main benefit of using millimeter waves is the high resolution provided by short wavelengths (2.7 to 4 mm). The specific interest in the W-band stems from the increasing number of applications. The system provides multi-frequency, multi-view (multiple receiver positions) data at a single incidence, as the emitter is fixed. In the context of future imaging applications, we seek high accuracy in the measurements. For this, we compare the experimental results obtained from two PEC cylinders with the analytic solution. Raw measurement data have been calibrated during postprocessing in order to account for misalignment errors and noise of the measurement system. Therefore the large cylinder is used as the reference target for deriving the calibration coefficients and the small cylinder is used as a test object. Averaged values of the signal-to-noise ratio over the W-band are 15.5 dB and 10 dB for the large and the small cylinder, respectively. Measurement results are used for the first time in W-band for quantitative imaging.