This paper reports magnetic near-field probe for high frequency band up to 10 GHz and novel measurement technique for improvement of spatial resolution. We fabricated two types of magnetic near-field probe and evaluated frequency characteristics for magnetic and electric near-field in isolation. For the measurement results, we proposed accurate equivalent circuit of probes and evaluated each value of lumped parameter to study the difference of probes. Theoretical results accorded with measurement results. With use of fabricated probe, measurement technique for improvement of spatial resolution was proposed. This technique allows improving and easy modification of spatial resolution without redesign of probe.
A position/signal difference method for electric nearfield measurements has been investigated and extended to a double position/signal difference method in order to independently extract the normal and tangential electric nearfield components using two measurements at slightly different heights above the test object. A printed monopole probe was fabricated and used for electric near-field measurements above a microstrip line using the proposed method. In addition, full-wave electromagnetic simulations were carried out and the measured normal and tangential components were found to be in good agreement with the simulation results at 1 GHz.
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