New Resonant Probes With High Detection Sensitivity and Measurement Characteristic of Two Orthogonal Magnetic-Field Components

In this article, two new magnetic-field resonant probes, which have high detection sensitivity and measurement characteristic of two orthogonal magnetic-field components, are developed and fabricated on a four-layer printed circuit boards (PCBs). Designed probes are composed of a U-shaped loop with a shorted strip (Probe A), two orthogonal shorted loops (Probe B), two 50-
$\Omega $
strip lines, and a pair of inductor–capacitor (LC) resonant strips. In order to prevent unwanted electromagnetic modes, several rows of via fences are inserted into these probes. First, two different detection structures are utilized to test two magnetic-field components. Second, a pair of LC resonant strips are used to enhance the detection sensitivity by exciting the resonant point at 1.575 GHz. Finally, the proposed probes are simulated, manufactured, and measured experimentally to evaluate the accuracy of design. Experimental results demonstrate that these new resonant probes can not only simultaneously test two orthogonal magnetic-field components but also exhibit high detection sensitivity at 1.575 GHz.