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EMC measurements according to CISPR 25 during a component's development process in the automotive industry are expensive and time-consuming. In order to avoid these disadvantages alternative measurement methods are desired. One of such pre-compliance methods for estimating radiated emissions is the transfer function method. With this method radiated emissions can be calculated based on disturbance...
This paper describes a measurement of microscopic radio frequency (RF) field distribution with a magnetic force microscope (MFM) tip exploring a beat signal from a coplanar waveguide (CPW). This CPW has a 5 μm wide signal line and a 50 μm wide ground line assuming a basic model of power/ground lines in radio frequency integrated circuit (RFIC) chips. To produce a beating field near the CPW, a signal...
We present an automated near-field testbed for system- to chip-level EMC/EMI evaluations in the RF domain. The scanning system combines a large scanning volume of 500×500×100 mm3 with micrometre resolution. A novel optical surface reconstruction system allows measurement of the height map of the device under test (DUT) with better than 20μm uncertainty. This allows scanning at a precise distance above...
Planar spiral inductors made of a single-wall carbon nanotube (SWCNT) bundle are investigated in order to achieve higher values of the quality factor for high frequency automotive applications. The inductor is modeled as an equivalent circuit whose frequency dependent parameters are obtained by an analytical/numerical procedure. A sensitivity analysis to some design parameters is carried out for frequencies...
Controlling the common-mode currents induced on wiring harnesses plays an important role in meeting automotive electromagnetic compatibility requirements. For high-frequency signals, the key to controlling these common-mode currents is maintaining the same electrical balance in the harness that was present on the circuit board. When routing differential signals such as LVDS or CAN signals, designers...
The continuous increase of demand for radios navigators makes the use of Automatic Test Equipments compulsory, in order to reduce the testing time and cost. The Telemakos is an Italian test equipment specifically designed to check radio navigator sensitivities. The paper reports the electromagnetic compatibility analysis carried out to meet the noise specifications. The Telemakos test bench is a very...
Electromagnetic Compatibility (EMC) is a challenging task in today's highly developed electronics. Near-field scanning provides an insight into the physical behavior of circuits and thus allows understanding the problems. Therefore, near-field scanning enables a well-directed optimization regarding EMC in electronic systems. It is a thorough task to gain the electric and magnetic fields from the measured...
Information leakage via electromagnetic (EM) radiation is an emerging issue for designers and users of electrical information devices. The importance of estimating the propagation area of information leakage is increasing due to the high demand for protecting such devices from eavesdroppers. We propose an efficient method for estimating the propagation area of information leakage via an EM field....
In this paper, current intentional electromagnetic interference studies in Europe are summarized. Three projects are addressing the call from the European Commission within the Security theme of the Seventh Framework Programme for Research, with as topic: “Protection of Critical Infrastructure (structures, platforms and networks) against Electromagnetic (High Power Microwave (HPM)) Attacks.” The projects...
Using a low frequency lightning location system comprising 9 stations, we have observed and analyzed 374 large and bipolar electric field change waveforms that occurred during the winter of 2012–2013 in Japan Sea Coast. Since the waveforms are different from those produced by any well-studied lightning discharge processes, in this paper, their source discharge events are called large bipolar events...
Since 2012, the global lightning and sprite measurements (GLIMS) mission has been conducted on the exposed facility of Japanese experiment module (JEM-EF) of the international space station (ISS). In this mission, the VHF broadband digital interferometer (VITF) attached on JEM-EF is designed to estimate the direction of arrival of electromagnetic waves. The VITF has the bandwidth from 70 MHz to 100...
We derived expressions of power and ground voltage noises for reducing common-mode voltage in a power distribution network of an LSI and found that they have the same amplitude and a phase difference approaching 180°. To confirm this, we performed an experiment using a test board with a cover-metal structure-essentially, a floating conductor in an LSI package to reduce common-mode voltage. The evaluation...
The pyramidal wave absorbers are widely used in anechoic chambers which frequently used for EMC or antenna measurements. It is important to know reflection characteristics of pyramidal absorbers to improve the performance of anechoic chambers. It is known that diffracted or scattered waves are excited when the pyramidal wave absorber is irradiated by a plane wave, thus to know the characteristics...
An on chip active magnetic field probe has been developed for IC chip-level magnetic near field measurements. A low noise amplifier (LNA) and a loop coil were implemented in 0.18 μm Si-CMOS technology, and solder-bonded to PCB to complete the probe. Its gain is 13.3 dB at 2 GHz. The probe is applied for magnetic near field evaluation of a test element group (TEG) chip that emulates Long Term Evolution...
A new real-time and high resolution electromagnetic wave source visualization system is presented. The system can determine the angle of incidence and visualize the wave source by combining a Lüneburg lens and an electromagnetic band gap (EBG) absorber. The Lüneburg lens is used to physically separate the different direction incident wave and focus them into the different focal points on the lens...
Crossed anisotropy amorphous Co85Zr3Nb12 thin film with total magnetic thickness of 2.0 μm is deposited on to the passivation of a bare IC chip to accommodate intra IC chip level digital-to-RF noise suppression and telecommunication performance. On-chip magnetic film processes can be done as the last steps of Si CMOS back end processes. Radiated emission from embedded arbitrary noise generator is...
Based on our recently developed numerical simulation technique, we simulated the electrokinetically induced co-seismic electromagnetic signals associated with seismic waves. We focused on the characteristics of the co-seismic electromagnetic signals generated by a double couple point source or a finite fault source in the models with different structures. The effects of source time function type and...
The depression (reduction in amplitude) of ULF (ultra-low-frequency) magnetic field variations observed on the Earth's surface is found for the recent huge Japan earthquake (EQ) (magnitude(M) ∼ 9.0) on March 11, 2011 which is a typical oceanic EQ of the plate type. In order to confirm the presence of such a ULF depression, we have also studied the additional two huge oceanic EQs in the Kurile islands...
In order to verify and clarify the ULF seismo-magnetic phenomena, a statistical investigation of the relation between magnetic anomalies and local seismicity has been performed. Geomagnetic data observed during 2001∼2010 at the Kakioka observation (JMA), Izu and Boso stations have been analyzed. Energy of ULF geomagnetic signals at the frequency around 0.01Hz has been investigated by wavelet transform...
This paper was intended to find out any relation between anomalous line-of-sight propagation on VHF radio band and occurrences of earthquakes near the radio propagation path. For that purpose, we established a multidirectional VHF band monitoring system and monitored the waves continuously over the long time. After stochastic consideration of fluctuation in the monitored waves, it was found out that...
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