David Campbell Microstrip Calculator Microstrip Calculator

Microstrip Calculator
With thanks to David Campbell for the use of this calculator

Substrate Parameters

  • εr: Relative permittivity of the substrate.
  • Tanδ: Loss tangent of the substrate. This parameter is used for the loss calculations. The higher the value, the larger the loss.
  • Rho: Conductor resistivity relative to copper. This parameter is used for the loss calculations. When in doubt, use 1 for copper, .946 for silver, or 1.45 for gold.
  • Height: Height of the substrate.
  • Thickness: Thickness of the microstrip conductor. This can be set to zero, but the calculated loss will not include conductor losses.
  • Frequency: Frequency at which the microstrip transmission line is analyzed or synthesized.
  • GHz
  • mils
  • mils
  • GHz

Analysis/Synthesis Values

  • mils
  • Ohms
  • mils
  • degrees
  • dB

εeff is the calculated effective dielectric constant of the microstrip line due to the nonhomogeneous nature of the structure (i.e., the structure is made up of two dielectric materials: air and the substrate material).

Loss is calculated as a combination of dielectric loss and conductor loss at the analyzed/synthesized length. If the conductor thickness is set to zero, the loss will only include the dielectric loss component.


References

E. Hammerstad and O. Jensen, "Accurate Models for Microstrip Computer Aided Design", 1980 IEEE MTT-S International Microwave Symposium Digest

R.K. Hoffmann, "Handbook of Microwave integrated Circuits", 1987

K.C. Gupta, "Computer-Aided Design of Microwave Circuits", 1981