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Electromagnetic Compatibility (electromagnetic + compatibility)

Distribution by Scientific Domains

Engineering	80%

Selected Abstracts

Web based laboratory in electromagnetic compatibility using a Java applet

COMPUTER APPLICATIONS IN ENGINEERING EDUCATION, Issue 4 2006
S. K. Goudos
Abstract A web based virtual laboratory in electromagnetic compatibility using a Java applet is presented. The Java applet makes use of Green's functions calculations inside a rectangular cavity. The induced electric fields and surface currents on cavity walls are calculated and visualized in a user-friendly manner. Various source configurations are examined. A number of laboratory exercises using the applet is given. © 2006 Wiley Periodicals, Inc. Comput Appl Eng Educ 14: 269,280, 2006; Published online in Wiley InterScience (www.interscience.wiley.com); DOI 10.1002/cae.20087 [source]

Modified methodology for computing interference in LEO satellite environments

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING, Issue 6 2003
Raúl Chávez Santiago
Abstract Computing interference is very important in satellite networks design in order to assure the electromagnetic compatibility (EMC) with other radiocommunication systems. There are different methods to compute interference in geostationary (GEO) satellite systems including conventional methods using link budget equations and alternate methods such as increase in noise temperature. However, computing interference in low earth orbit (LEO) systems represents a different problem. Due to the special characteristics of this kind of orbits, the elevation angle at any site changes continuously over time, meaning a time dependent change of the propagation path length between an interfering transmitter and an interfered-with receiver, and of the discrimination provided by the transmitting and/or the receiving antenna. Thus, conventional interference prediction methods developed for fixed links must be adapted to the case of LEO systems. To overcome this problem a mathematical model that characterizes the path length variations by an average value obtained from the probability density function of the varying distance between an interfering transmitter and an interfered- with receiver is proposed in this paper. This average path length enables the use of conventional link budget methods to reduce the computation time for the evaluation of interference in LEO satellite environments. Two practical examples show the possible applications of the proposed model. Copyright © 2003 John Wiley & Sons, Ltd. [source]

EMC internal patch antenna integrated with a U-shaped shielding metal case for mobile device application

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2006
Chih-Ming Su
Abstract A novel integration design of a shorted patch antenna and a U-shaped shielding metal case for application in a mobile communication device is presented. The shorted patch antenna is mounted within the dented portion of the U-shaped shielding metal case, which can provide a coupling-free space for accommodating electronic components such as the RF modules/circuitry and battery in the mobile device. Thus, in this case, the shorted patch antenna can operate as an internal antenna having an electromagnetic compatibility (EMC) property with nearby electronic components. In addition, with the proposed integration design, the shorted patch antenna is isolated from the two side edges of the system ground plane of the mobile device. Hence, it can be expected that the effects of the user's hand on the performances of the antenna will be suppressed. The proposed integration design applied to a smart phone for Universal Mobile Telecommunications System (UMTS, 1920,2170 MHz) operation is studied. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1157,1161, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21552 [source]

Power variations of wireless communication systems

BIOELECTROMAGNETICS, Issue 4 2010
J.B. Andersen
Abstract The use of wireless digital communication devices like GSM, WCDMA, HSPA, DECT, and WiFi changes the exposure of electromagnetic waves toward the user. Concentrating on the power variations on a slow and fast time scale, these new systems are discussed. Experimental results for both uplink and downlink are included for a sample of systems. The spectrum of the power fluctuations is seen as a convenient and compact way of describing very complex system behavior. The results are of interest for scientific studies of epidemiology and biological effects, and for general electromagnetic compatibility (EMC) aspects. Bioelectromagnetics 31:302,310, 2010. © 2010 Wiley-Liss, Inc. [source]