A reliable numerical modelling for shielding evaluation of on-package conformal shields based on the integrated circuit (IC)-stripline method is presented. As a pilot test, the effects of the number of grounding pads and the thickness of a conformal shield on the shielding performance are investigated. For validation, the conformal shield is fabricated and measured by both the IC-stripline method and TEM cell method.
Design and performance of a new type of Kerr microscope based on heterodyne cross-polarized technique is presented. Weak depolarization of the probe beam due to longitudinal magneto-optical Kerr effect is detected by means of heterodyne mixing of the two cross-polarized and frequency shifted waves generated by Zeeman-type He–Ne laser. In comparison with the traditional homodyne method the proposed technique has better sensitivity and spatial resolution. Experimental results of imaging service magnetic tracks on real samples of magnetic disks are presented, showing better contrast and spatial resolution with respect to the images obtained from commercial devices available in the market.
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