( )Engineering Information Abstracts Part I 491

nance costs for the customer, it is absolutely necessary to takeinto consideration the backwards compatibility issues. In En-

Ž .glish Author abstract 5 Refs. EI Order Number: 98024058391Keywords: Electric power systems; Telecommunication equip-ment; Cost effectiveness; Electric equipment protection; Acci-dent prevention; Electric power supplies to apparatus

Title: MANAGING THE RELATIONSHIP BETWEEN ELEC-TROMAGNETIC COMPATIBILITY, THERMAL DESIGN,AND COMPONENT LIFE

( )Author s : Alexander, Ray; Burns, JamesSource: Proceedings of the 1997 1st Annual InternationalSystems Packaging Symposium Dec 2-5 1997 San Diego, CA,USA. International Microelectronics and Packaging SocietyReston VA USA. p 150-155 CODEN: 002761Publication Year: 1997Abstract: System thermal management, containment of elec-

Ž .tromagnetic interference EMI , and control of audible noise,are all highly inter-related. Control of these design constraintsimpact system availability and Mean Time Between FailureŽ .MTBF . Typically, the lowest cost thermal solution will havea negative impact on MTBF. However, products are allowedto implement these solutions for several reasons; modern ICscan tolerate more heat and the product designer is allowed toavoid the overall cost of the system. Total cost of systemoperation and availability is incurred by the customer. Forlarge commercial computers, product engineers will generatesite preparation documents. This document contains require-ments which allows proper operation of delivered hardware.Typically, data centers and network hubs employing largecommercial data processing equipment require tons of airconditioning with associated delivery schemes. In EnglishŽ .Author abstract 5 Refs. EI Order Number: 98024043152Keywords: Electronics packaging; Electromagnetic compatibil-ity; Service life; Integrated circuits; Computer hardware; Fail-ure analysis

Title: DISTRIBUTION CHARACTERISTICS OF UN-WANTED EMISSIONS AROUND A BUILDING

( )Author s : Maeda, Yuji; Komatsu, Yoshiyuki; Hattori, MitsuoSource: Electronics & Communications in Japan, Part I: Com-

Žmunications English translation of Denshi Tsushin Gakkai.Ronbunshi v 80 n 12 Dec 1997. Scripta Technica Inc New

York NY USA. p 47-57 ISSN: 8756-6621 CODEN: ECJCEDPublication Year: 1997Abstract: The distribution characteristics around a building ofunwanted VHF emissions from electronic equipment are ana-lytically and experimentally investigated at 100 MHz and 170MHz, which are close to television frequencies. First, bymeans of electromagnetic field simulation based on the wiregrid approximation, the distribution characteristics of un-wanted emissions around a building are derived. Next, verifi-cation experiments are carried out at three locations: a flatopen field, a suburban area with sparsely located buildings,

and a residential area. It is found that the distance character-istics of the unwanted emissions can be found by evaluatingthe unwanted emissions in terms of the maximum value of theheight pattern and that the distribution characteristics of theunwanted emissions can be obtained with a deviation notexceeding 2 dB from the maximum value if measurement iscarried out at 0.60 intervals in a circumferential direction,parallel to the ground and centered at the building. It ispossible to estimate the distribution of the unwanted emis-sions further away by using the measured values at locationsabout 100 m away from the building in an open area and a

Ž .suburban area. In English Author abstract 12 Refs. EI OrderNumber: 98014034654Keywords: Electronic equipment; Spurious signal noise; Com-puter simulation; Electromagnetic fields; Electromagneticcompatibility; Electromagnetic wave interference; Estimation;Approximation theory

Title: LOWER EMI SOFT-SWITCHING RESONANT IN-VERTER USING SIGMA-DELTA MODULATION

( )Author s : Li, F.; Singh, S.S.; Thomas, R.Source: Proceedings of the 1997 32nd Univertsities Power

Ž .Engineering Conference, UPEC’97. Part 2 of 2 Sep 10-121997 v 2 Manchester, UK. Technological Educational InstituteIraklio Greece. p 1053-1056 CODEN: 002221Publication Year: 1997

Ž .Abstract: Sigma-delta modulators SDM are considered suit-able for resonant link soft-switching inverters. However, it hasbeen shown that basic SDMs need to work at frequenciesmuch higher than PWMs to maintain the same THD perfor-mance. Excessively high working frequency may degrade over-all EMC performance. This paper presents a method to designlow EMI resonant link inverters by means of using high order

Ž .SDMs. In English Author abstract 5 Refs. EI Order Num-ber: 98013997823Keywords: Electric inverters; Switching; Design; Performance;Electromagnetic compatibility; Modulators

Title: NEAR-FIELD SHIELDING AND REFLECTIONCHARACTERISTICS OF ANISOTROPIC LAMINATEDPLANAR COMPOSITES

( )Author s : Chiu, Huan-Ke; Lin, Ming-Shing; Chen, Chun Hsi-ungSource: IEEE Transactions on Electromagnetic Compatibilityv 39 n 4 Nov 1997. IEEE Piscataway NJ USA. p 332-339 ISSN:0018-9375 CODEN: IEMCAEPublication Year: 1997Abstract: A theoretical model is proposed to study the near-field shielding and reflection characteristics of anisotropiclaminated planar composites. Specifically, the plane-wavespectral representation is used to express the dipole field andthe wave-transmission matrix technique is employed to dealwith the transmitted and reflected fields. In this study, numeri-

Ž . Ž .cal results for graphiterepoxy GrE and boronrepoxy BrE