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Digitale Medien

Capacitance of semiconductor-electrolyte junction and its frequency dependence (1996)

Wang, Y.-B. ; Yuan, R.-K. ; Willander, M.

Springer

Applied physics 63 (1996), S. 481-486

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ISSN: 1432-0630

Schlagwort(e): PACS: 73.40.Mr

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract. The frequency dependent capacitance of semiconductor-electrolyte junction and its relationship to the surface roughness of the semiconductor and the ions in the electrolyte are discussed. Due to very low mobility of the ions, the observed capacitance can be dominated by the Helmholtz double-layer of the electrolyte rather than the space charge layer of the semiconductor. The capacitance will also depend on the frequency. This, often observed power-law frequency dependence of capacitance is ascribed to the contribution of constant phase angle impedance. The power-law exponent can easily be related to the fractal dimension if the semiconductor surface can be described by fractal geometry.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01571678

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Digitale Medien

Single and multi-section CTL and branch-line CPW directional couplers with broadband performances for SIMMWIC (1994)

Bruce, S. ; Rydberg, A. ; Seibt, W. ; [weitere]

Springer

International journal of infrared and millimeter waves 15 (1994), S. 751-761

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ISSN: 1572-9559

Schlagwort(e): CPW ; Couplers ; SIMMWIC

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Single and multisection branch-line and coupled transmission line (CTL) directional couplers have been implemented in coplanar waveguide (CPW)-technology, showing broadband performances. The branch-line and CTL couplers had a phase balance of ±5° and a power variation of ≤1.5 dB in the coupling over a bandwidth of greater than 25% and 75% respectively. The experimental values for the couplers were found to agree well with simulated results. The CPW couplers provide larger bandwidth than comparable microstrip couplers. Investigation on different feeding structure for the branch-line couplers is also presented.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02096488

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