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Many millimeter-wave exposure experiments using animals have been performed in order to investigate the possible health effects in the past but a few of them could provide dosimetry analysis. In this paper, we apply the Poggio-Miller-Chang-Harrington-Wu-Tsai method of moments to investigate differences in the absorbed power distribution due to three different exposure conditions; a rabbit head phantom...
In analog-digital mixed circuit boards, noises from the digital side to the analog side through G ND power supply layer is one of the problems. As one of the methods to reduce noise, slot type GND power supply layer is used. It is to divide G ND power supply layer with slot. However, this method has problems. One of the problems is impedance mismatch on the signal line between the analog and digital...
Recently, wireless radio terminals such as mobile phones and tablet computers are increasing and developing rapidly. The effects of the electromagnetic (EM) waves in the human body from the wireless radio terminal have been paid attention. Therefore, we have calculated the specific absorption rate (SAR) in human tissues radiated from simple EM source models as like dipole antennas. In this paper,...
Resonances in power distribution network are the major cause of voltage fluctuation and noise problems. In this paper, a new method that suppresses impedance peak is proposed. The proposed method uses a high series resistance (HSR) capacitor in parallel to regular bypass capacitors. By selecting the parameters so that the series resonance frequency of the HSR capacitor equals to the anti-resonance...
Several solutions to decrease the propagation of simultaneous switching noise (SSN) in power distribution network (PDN) were evaluated for boards with active components. Radiated emission of the boards using power track, 2 cell symmetric power island (or one-cell Electromagentic Band Gap (EBG)) with square patches or asymmetric EBG was measured using a Reverberation Chamber, and the results were compared...
Electronic equipment is often susceptible to the maximum field strength instead of the average field strength. The difficulty of finding the absolutely maximal field strength inside a reverberation chamber arises from the troublesome link between the statistical and deterministic approach. The established theoretical models propose interesting solutions to this problem but require more experimental...
In this paper, a case study on the merit of adding the LISN for radiated-emission (RE) testing is demonstrated. For this study, a site source is created and considered as the device under test. This site source, activated by AC power, can generate harmonic reference signals ranging from 30 MHz to 1 GHz. The site source is then measured for numerous times. A large variation among these measurements...
This paper presents a new proposal for the unified evaluation of ultra wideband and narrowband radio communication systems electromagnetic compatibility, called “compatibility region”. The idea of compatibility region is based on the relation between the ratio of narrowband to ultra wideband signal power in a receiver and some transmission quality indicators (bit error rate, effective data rate).
In this paper, shielding effects of some enclosures composed with thin wires (wire arrays) are studied. For examples, the thin wire arrays lined on a circle making a tube are analyzed to evaluate the shielding effectiveness as well as the field distributions in and around the structure. The near fields formed by the wire system that includes an active wire or a wire driven by an external power source...
A novel design method has been developed to solve the Intra-EMC problem in mobile equipment. Recently, there has been a great deal of interest in the deterioration of receiver sensitivity due to the leakage of noise into a receiver circuit via the antenna. To solve this problem, we developed a design method in our previous studies that could estimate the optimal layout of a noise source according...
The TL (transmission lines) and the GW (ground wires) ice covering represents a danger to the power systems' operation. When the ice-melting procedure using rectifiers is conducted, accidents due to the induced EMF in the GW from the TL currents are possible. In this paper the induced EMF values are calculated for different TL operation modes, different positional TL relationship and different ice-melting...
In this paper, we have fundamentally studied the estimation of 10 m test-range electric field strength height pattern by means of measuring the tangential electromagnetic fields on the cubic surface surrounding Bi-conical and Log-periodic antennas placed above the ground plane by using the differential electric and magnetic probe. The analysis frequency range is from 30 MHz to 1GHz, and the polarization...
This paper describes the results of calculating and measuring deviations of conducted disturbance voltages caused by differences in the arrangement of an artificial mains network (AMN) used to measure the voltage, for example, the height of the (AMN) from a horizontal reference ground plane and the connection between the AMN and the ground plane. The results indicated that the conducted disturbance...
A common mode choke coil (CMC) is mounted on the differential signal lines to suppress common mode noise propagating on differential signal lines. To evaluate the noise suppression effect of the CMC in the design phase of the equipments, 3D electromagnetic simulation considering the physical structure of the circuit, such as the pattern layout of the printed circuit board and inter connection, should...
The impact of passive signal integrity (SI) improvement techniques on the radiated emission (RE) for different interconnections between digital devices is presented. In high speed digital integrated circuits, SI is no longer the only issue for desired functional performance. RE is also critical for the functional performance and for compliance with EMC standards. Hence, it is important to understand...
The guard trace is effective for suppressing common-mode generation caused by placing a signal trace close to the return edge on a printed circuit board. Our previous studies on the guard trace focused only on a design methodology for reducing common-mode radiation, but the placing guard trace close to the signal line increases crosstalk to deteriorate signal integrity. A guard trace with a periodic...
In this study, common mode current, a dominant factor of unintentional radiation, on coaxial cable with twisted wire pair (TWP) is estimated. This cable model is a simplified model of a popular combination of balanced and unbalanced circuit, such as printed circuit board (PCB) with TWP. For the convenience of calculation and measurement the coaxial cable is employed as an unbalanced circuit instead...
Dosimetry for the two resonant modes of resonance-based wireless power transfer system is investigated and compared. We present the physical mechanism for the two resonant modes with the simulated results and the equivalent circuit models for the wireless power transfer system. The difference between the two resonant modes for the specific absorption rate induced in the head model is discussed by...
This paper describes Electromagnetic Interference (EMI) with medical devices used in hospitals from third generation mobile phone. Transmission power, frequency, radiation mode, and radiation sources are considered to investigate the relationship with EMI. Long Term Evolution (LTE), High Speed Packet Access (HSPA), and Wideband Code Division Multiple Access (W-CDMA) are selected as the transmission...
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