Microstrip Resistance Model
DC resistance of microstrip conductors is:
AC resistance of microstrip conductors is:
Skin Depth is:
Resistance calculated using this tool includes both dc and ac resistance of microstrip conductors. At low frequencies, where skin depth is greater than conductor width and thickness is greater than ground plane thickness, ac resistance is approximately the same as the dc resistance. As frequency increases, ac resistance increases.
Assumptions and Limitations
Dimensions are in meters.
Trace conductor is assumed to have uniform circular cross section and to be uniformly spaced above the ground plane over its length.
Separation between the conductors is assumed to be large enough that proximity effect may be ignored.
Wire relative permeability:
Wire relative conductivity:
Permeability of free space: H/m
Conductivity of copper: = 5.98 x 10 7 S/m (Siemens per meter) at 20-degrees C
Reference: “Analysis of Multiconductor Transmission Lines,” 2nd Ed., Clayton R. Paul, 2008.