ANT120 - The Friis Transmission Equation

The Friis transmission equation is used to predict the coupling between two antennas under the assumption of free-space and far-field conditions. It can be used to predict the coupling between a transmitter and a receiver, it can also be useful in the calibration of antennas or field strength measuring devices.

The course outline is as follows:

• Introduction
• Derivation
  • The Isotropic Radiator
  • Antenna Directivity
  • Antenna Gain
  • Power Density
  • Effective Area
  • Polarization Mismatch
  • Mismatch Loss
  • Other Losses
• The Equation
  • Harald T. Friis
  • The Simplified Form
  • The Simplified Form in dB
  • The General Form
  • The General Form in dB
• Applications
  • Antenna Measurement
  • Communications
  • Radar
• Example Calculations
• Friis Transmission Calculator
• Summary

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