Microwave Interferometric on-chip Measurement of the Collagen Gel

A highly sensitive microwave interferometric sensor system for on-chip measurement of biogenic materials is presented in this paper. Based on the proposed wave-tracing method for signal analysis, we provided suggestions on optimization of the system and sensitivity improvement. The validation measurements on the collagen gel show that the proposed tapered CPW sensor has relatively smaller electrical double layer effects than the dielectric probe, which enables it to monitor the permittivity change caused by collagen gel polymerization.