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In this paper, an analysis method and a measurement method for anisotropic magnetic shielding effectiveness (MSE) are discussed. Some magnetic sensors and memories require small magnetic shielded packages to decrease the influence of external magnetic noise. Whereas, the packages are applied for the external noise from various directions, sensitivity of the magnetic device in the package is affected...
An electrically small planar antenna using a broadside-coupled split ring resonator (BC-SRR) with a simple structure is presented. Due to the capacitance between the two SRRs in the BC-SRR, the resonant frequency of the antenna is lowered without increasing the size of the antenna. The proposed antenna resonates at 2.45 GHz and 7.31 GHz. At 2.45 GHz, the dimension of the SRR in the proposed antenna...
This paper presents grounding design for shielded packages to obtain high shielding effectiveness at low cost. Shielded packages are required for high-speed LSIs in mobile handsets and should have not only shield layers with high conductivity but also ground pattern arrangement on interposers. While arranging a ground area on an interposer is indispensable for high shielding effectiveness, a large...
High-speed short-range wireless communication systems utilizing the 60-GHz band are expected. An installation of a 60-GHz transceiver into a mobile terminal with high packaging density is one of the promising usages. Electromagnetic noise in the mobile terminals is an important issue, because it may degrade the communication quality of the 60-GHz transceiver. This paper presents a novel antenna-in-package...
In this paper, we describe the simulation results of electromagnetic (EM) noise generated by fast switching circuits with gallium nitride (GaN)-based power devices. The frequency ranges of the EM noise extend to several hundred MHz because the GaN devices possess low parasitic capacitance. Therefore, we analyze both the conducted noise of the switching circuits and the radiated noise from the circuit...
This paper presents a laminated shield consisting of conductors and a magnetic material multilayer. The laminated shield provides a high shielding performance in an ultrahigh-frequency (UHF) band because the magnetic materials have high permeability and multi reflection occurs in the shield. Furthermore, the shielding performance is enhanced at the ferromagnetic resonance (FMR) frequency of the magnetic...
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