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Analysis and Design of a PCB Probe for Near Field Measurements

The paper presents the design and characterization of a magnetic field probe, fabricated using printed circuit board (PCB) technology. The frequency range and sensitivity of the probe were analysed using a Finite Element Method (FEM) simulation model developed in Ansoft Maxwell 3D and Ansoft HFSS. The probe is cheap and easily fabricated on a FR4 substrate with only 2 layers. A measurement setup is shown for generating a uniform magnetic field, which is used for calibrating the probe. The magnetic field is generated using Helmholtz coils and the probe is calibrated against Rohde&Schwarz HZ-10 pickup coil as a reference. A detailed comparison between the theoretical, simulated, and measured results is given and discussed, including sensitivity, inductance and frequency range of the probe. The probe’s intended use is for magnetic field measurements and pre-compliance EMC measurements.

Near field probe, Planar PCB coil, FEM, Magnetic field measurements, Electromagnetic compatibility

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