A 13-GHz “3D” Near-field Imager employing Programmable Fringing Fields for Cancer Imaging

This paper presents a field-programming technique for 3D near-field medical imaging at microwave frequencies. The design employs a stacked electrode pair to control the fringing electric fields based on impedance modulation principle and images tissue permittivity using standing-wave oscillators. Implemented in 180-nm CMOS, the imager consists of 220 50um×50um pixels and consumes 6.2mW/pixel of power. 3D Imaging is demonstrated using microfluidics and phantom samples achieving ~1um depth resolution.