A High-Sensitivity Electric Probe Based on Board-Level Edge Plating and LC Resonance

A near-field probe fabricated on a printed circuit board (PCB) with a high sensitivity to electric fields is proposed. To achieve high sensitivity, board-level edge plating technology is employed to realize a copper patch replacing conventional pin-type electrodes. In addition, the sensitivity is further enhanced at a specific frequency band based on LC resonance. The proposed electric probe has been experimentally validated by near-field measurements on an application processor (AP) used in latest mobile phones with a sensitivity enhancement of around 20 dB in the Global Positional System (GPS) band compared to a commercial electric probe.