RF magnetic shielding effect of a sealed bottom HTS cylinder

Itoh, Eisuke; Hotta, Yukio; Itoh, M.; Munser, N.; Pleva, J.; Jaszczuk, W.; Altenburg, H.

doi:10.1109/77.920344

Cited by 10 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The signal from the receiving antenna is amplified by 38 dB by use of a preamplifier (Sonoma, 317), and then guided to the input terminal of the spectrum analyzer. In this arrangement, the coaxial cable employed as the receiving line was threaded through ferrite rings in order to reduce any interaction between the transmitting and receiving lines, as reported in [3]- [7]. In Fig.…”

Section: B Evaluation Of the Rf Magnetic Shielding Effects For Slit mentioning

confidence: 99%

“…A slit (42 mm in length , 1 mm in width ) was cut on the center of BPSCCO plate surface with a diamond saw. The saw was operated at low cutting speeds to inhibit any heat effects and to prevent cracking, as reported in [3]- [5]. is a schematic diagram illustrating the geometry of a typical perpendicular-oriented slit on the BPSCCO plate.…”

Section: A Fabrication Of the Slit Bpscco Platesmentioning

confidence: 99%

“…The RF magnetic shielding degree can be specified in terms of the reduction in the magnetic field strength, which was reported in [3], [8]. In general, the value of is defined as .…”

Section: B Evaluation Of the Rf Magnetic Shielding Effects For Slit mentioning

confidence: 99%

See 2 more Smart Citations

Orientation Characteristics in RF Magnetic Shielding Effects of BPSCCO Plates

Nishikubo

Endo

Itoh

2009

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

As one of the basic areas of research for improvement of the electromagnetic environment by use of a bulk high-critical temperature superconductor, the present paper has examined a Bi-Pb-Sr-Ca-Cu-O (BPSCCO) plate with a slit, which displays orientation characteristics in the RF magnetic shielding. According to the results, the value of the RF magnetic shielding degree HP , when orienting the slit of the BPSCCO plate perpendicular to the ground, increased in the frequency region of 1 MHz (20 dB) to 30 MHz (40 dB), and then reminded approximately constant in the region of 30 MHz to 3 GHz (40 dB). The value of the RF magnetic shielding degree HH when orienting the slit horizontally indicated an average value of 15 dB in the region of 1 MHz to 3 GHz. Namely, the difference in the RF magnetic shielding degree, HP HH , as related to the direction of the slit represents orientation characteristics. Experimental results revealed several characteristics of the slit BPSCCO plate that include the dependencies of the orientation characteristics on the slit length, slit width, and slit number.

show abstract

Section: B Evaluation Of the Rf Magnetic Shielding Effects For Slit mentioning

confidence: 99%

Section: A Fabrication Of the Slit Bpscco Platesmentioning

confidence: 99%

See 1 more Smart Citation

Orientation Characteristics in RF Magnetic Shielding Effects of BPSCCO Plates

Nishikubo

Endo

Itoh

2009

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, with the rapid development in the field of information technology, there has been an increased need for electromagnetic shielding in the radio frequency (RF) region [1][2][3][4][5][6][7][8]. Electromagnetic shielding plates are used to reduce the influence of environmental electromagnetic waves, and to protect the environment from the leakage of generated electromagnetic waves [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

RF Magnetic Shielding Effects of an Aggregated Plate Constructed from Carbon Tiles

Nishikubo¹,

Endo²,

Norikane³

et al. 2007

Trans. Mat. Res. Soc. Japan

Self Cite

View full text Add to dashboard Cite

The contamination of the environment by electromagnetic pollution has increased with the increased employment of electronic instrumentation. The use of electromagnetic shielding in the radio frequency (RF) region has, therefore, increased in order to improve environmental conditions. It is known that the value of RF magnetic shielding degree SDH for a superimposed plate, constructed from carbon and ferrite plates, does not equal the sum of the individual SDH values of the carbon and ferrite plates. In the present paper, an aggregated carbon plate ( 46 mm squere) is formed, constructed from carbon tiles (9.2 mm length, 9.2 mm width, 2 mm thickness). A compound plate was constructed by the superimposing a ferrite plate over the aggregated carbon plate. It was found that the values of SDH for the compound plate equaled the sum of the SDH values of the aggregated carbon and ferrite plates. Experimental results revealed several characteristics of the compound plate, including for example, the dependence of SDH on radio frequency, and the dependence of SDH on the value ofRF output power.

show abstract

“…The bincho-charcoal tile exhibits the scanty porous structure without cracks. Figure 3 is a schematic diagram illustrating the experimental arrangement used to measure the RF electromagnetic shielding effects, SD H and SD E , at the center of a bincho-charcoal plate under temperature condition of 300 K (2) ~ (5) . In the present research, it is measured the SD H and SD E under the constant air space (3.4 m 3 ).…”

Section: Fabrication Of the Bincho-charcoal Platementioning

confidence: 99%

RF Magnetic Shielding Effects of a Bincho-Charcoal Plate

Itoh

2004

IEEJ Trans.EIS

View full text Add to dashboard Cite

MemberRecently, there has been increased interest for electromagnetic shielding in the radio frequency (RF) region. The use of effective electromagnetic shields has, moreover, been required to improve the electromagnetic environment. The present paper has applied bincho-charcoal, a high quality charcoal found in Japan, to improve RF electromagnetic shields. Bincho-charcoal makes an excellent shield, due to a very large value of relative permittivity in the RF region. In the present research, the evaluation of the RF magnetic shielding degree SD H of the bincho-charcoal was limited to a plate being exposed to an electromagnetic wave. The SD H of the single plate was found to increase with an increase in RF frequency over the range from 1 MHz to 1 GHz. The value of SD H at 100 MHz was found to be about 15 dB. The present authors have, furthermore, improved the value of SD H by the use of a triple plate, constructed from three bincho-charcoal plates. The SD H of the triple plate at 100 MHz was found to be improved by about 15 dB over that of the single plate. In addition, the SD H was shown to be improved by the superposition of a copper plate over the triple plate.

show abstract

RF magnetic shielding effect of a sealed bottom HTS cylinder

Cited by 10 publications

References 7 publications

Orientation Characteristics in RF Magnetic Shielding Effects of BPSCCO Plates

Orientation Characteristics in RF Magnetic Shielding Effects of BPSCCO Plates

RF Magnetic Shielding Effects of an Aggregated Plate Constructed from Carbon Tiles

RF Magnetic Shielding Effects of a Bincho-Charcoal Plate

Contact Info

Product

Resources

About