Dispersion control of helical slow-wave structure by double-negative metamaterial loading
| Autor: | Subrata Kumar Datta, Amit Kumar Varshney, Biswajit Basu, Raktim Guha |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science business.industry Amplifier General Physics and Astronomy Relative permittivity Metamaterial 020206 networking & telecommunications 02 engineering and technology 01 natural sciences Molecular physics Electronic Optical and Magnetic Materials Optics 0103 physical sciences Helix Dispersion (optics) 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Phase velocity Relative permeability business Envelope (waves) |
| Zdroj: | Journal of Electromagnetic Waves and Applications. 30:1308-1320 |
| ISSN: | 1569-3937 0920-5071 |
| DOI: | 10.1080/09205071.2016.1198277 |
| Popis: | A helix supported by a double-negative metamaterial (DNG-MMT) surrounding it, in a metal envelope, was field-analyzed to show that the shape of the dispersion is more sensitive to the value of the relative permittivity of the metamaterial (MMT) than that of its relative permeability. The field analysis was validated against equivalent circuit analysis as well as against simulation. The values of the MMT support parameters were adjusted to obtain nearly flat, rather slightly negative, dispersion characteristics together with a high value of the interaction impedance of the structure as required for a wideband traveling-wave amplifier. Unlike in a conventional traveling-wave tube, the flow of power of RF wave supported by DNG-MMT loaded helix was found to be in a direction opposite to that of the RF phase velocity of the wave supported by the structure resulting in a negative value of the interaction impedance of the structure suggesting that the device using a helix with double-negative MMT support... |
| Databáze: | OpenAIRE |
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