Figure 6: Block diagram of the measurement set-up.
From: In-vivo, non-invasive detection of hyperglycemic states in animal models using mm-wave spectroscopy

SG, Signal Generator; Atenn, Variable Attenuator; PD, Power Divider; AFM, Active Frequency Multiplier; DC, Directional Coupler; Sample; Skin sample (animal); HMR, W-Band Receiver; HS4, Acquisition Hardware. The blue wires represent base band signals (12.5–18.5 GHz), the red wires high frequency signals (75–111 GHz) and the green wires represent intermediate frequency signals (9 MHz).