NDLI: Improvement in the Polarization Characteristics of a Slit Carbon Plate: The Superposition of Slit Ferrite and Copper Plates Over a Slit Carbon Plate

Content Provider	IEEE Xplore Digital Library
Author	Nishikubo, T. Endo, H. Itoh, K. Itoh, M.
Copyright Year	2002
Abstract	In order to improve the electromagnetic environment associated with the widespread use of electronic devices for communication, computation, automation, among other purposes, the present paper has developed a carbon plate that exhibits polarization characteristics. To achieve polarization characteristics in the far field, slits were cut into the surface of a carbon plate; termed the slit carbon plate. The value of the RF magnetic shielding degree SD_HP when holding the slits of the carbon plate perpendicular to the ground, in the frequency region of 140 MHz to 700 MHz, increased with frequency, and displayed a value of 35 dB at 700 MHz. It was also shown that the value of SD_HH, when aligning the slits horizontal to the ground, increased with frequency, and recorded a value of 5 dB at 700 MHz. Namely, the difference in the shielding degrees of the slit carbon plate for the orientation of the slits indicated polarization characteristics. In present research, the polarization characteristics of the slit carbon plate were improved, in the frequency region of 1 MHz to 800 MHz, by the superposition of slit ferrite and copper plates over the slit carbon plate; termed compound plate. For example, the difference between the values of SD_HP and SD_HH for the compound plate at 30 MHz was found to be improved by approximately 50 dB. In addition, important criteria are discussed for the design of a plate having polarization characteristics, for effective RF magnetic shielding.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1382
Ending Page	1386
Page Count	5
File Size	274460
File Format	PDF
ISSN	10518223
Volume Number	18
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ferrites Copper Carbon dioxide Radio frequency Magnetic shielding Electromagnetic wave polarization Electromagnetic shielding High temperature superconductors Magnetic materials Electromagnetic devices slit carbon plate Electromagnetic environment polarization characteristics RF magnetic shield
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Experimental Research on Improvement of the Orientation Characteristics of a Slit Ferrite Plate in the RF Magnetic Field: Superposition of a Slit Carbon Plate Over a Slit Ferrite Plate

Manufacture of an RF Magnetic Shielding Plate Having Orientation Characteristics

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Improvement in the Polarization Characteristics of a Slit Carbon Plate: The Superposition of Slit Ferrite and Copper Plates Over a Slit Carbon Plate

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Improvement in the Polarization Characteristics of a Slit Carbon Plate: The Superposition of Slit Ferrite and Copper Plates Over a Slit Carbon Plate