Printed magnetic field probe with enhanced performances

A novel circular magnetic field probe is proposed, and measured results are presented. The proposed probe is easily fabricated by printing technology. A set of quasi-periodic notches was embedded into the connecting portion and acted as a microstrip filter. The experimental results indicate that the proposed probe effectively suppresses the inherent resonances of the circular loop, and the usable frequency range of the probe is broadened. In addition, measured magnetic field up to 9 GHz with the probe is presented to verify the performance of the probe. The measured magnetic and electric near-field in isolation and spatial resolution indicate that the proposed probe has advanced performance for near-field magnetic field detection compared with the conventional probe.