Switchable double-sensor integrated active probe for near-field scanner

A switchable double-sensor input single-output is designed, fabricated and characterized in OMMIC GaAs pHEMT technology. The realized differential amplifier shows a gain of 28 dB and a 3 dB bandwidth of above 5 GHz. Two different miniature sensors (loop and dipole) are integrated at the input of the designed amplifier. This double-sensor probe will be used to measure a magnetic and an electric field component for a single spatial positioning of the probe. A measurement technique is proposed to prove the operability of the designed switchable double-sensor probe and results are presented.