Surface impedance of silicon substrates and films
Artikel i vetenskaplig tidskrift, 1998

It is shown that at microwave–millimeterwave frequencies and for DC resistivities below ρ+=(2πfτε0εL)−1 silicon should be regarded as a lossy metal characterized by resistivity, skin depth, and surface impedance, while at higher resistivities it may be regarded as a lossy dielectric characterized by a lattice dielectric constant (εL=11.7) and loss tangent. The sheet resistance defined as a ratio of DC resistivity to film thickness is not an adequate parameter to characterize the films at microwave frequencies. The surface impedance of a thin semiconductor film is complex with both real and imaginary parts strongly dependent on frequency, DC resistivity of substrate and film, substrate thickness, and the presence of a ground plane on the backside of the substrate

surface impedance

silicon MMIC

dielectric constant


Spartak Gevorgian

Institutionen för mikroelektronik och nanovetenskap

International Journal of RF and Microwave Computer-Aided Engineering

Vol. 8 6 433-440


Elektroteknik och elektronik

Annan elektroteknik och elektronik



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