Abstract
Magnetic-field probes can be used for electromagnetic interference (EMI) measurement of high-speed circuits. The main probe performances include sensitivity, spatial resolution and bandwidth. To improve the spatial resolution and bandwidth, the size of probe loop must be made small. However, small loop size will result in low sensitivity. In this paper, a pair of differential magnetic-field probes is proposed to improve spatial resolution without reducing sensitivity. The proposed differential probes consist of two asymmetric loop probes, which are designed in the same plane and separated by a row of periodic vias. High spatial resolution can be achieved by measuring difference between the outputs of the two probes. The differential probes are designed under low temperature co-fired ceramic (LTCC) process. The simulation results show that the maximum operating frequency is 15GHz and the spatial resolution is 0.36mm.
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