- #1
aashna
- 3
- 0
Can we apply friss equation to find field strength at the receiving point for space wave propagation?
The Friss formula gives the path loss between two antennas of specified aperture when in free space, so it does not directly give the field strength. The easiest formula for radiation from a dipole in free space is: E = (7* sqrt p / d^2 ) in volts per metre, volts, metres, watts.aashna said:Can we apply friss equation to find field strength at the receiving point for space wave propagation?
thank you!tech99 said:The Friss formula gives the path loss between two antennas of specified aperture when in free space, so it does not directly give the field strength. The easiest formula for radiation from a dipole in free space is: E = (7* sqrt p / d^2 ) in volts per metre, volts, metres, watts.
The formula is not applicable for propagation over ground.You can introduce factors for gain and ground reflection if required. Be careful if a monopole antenna.
yeah!tech99 said:Agree, but you asked if the Friss formula gave field strength. The formula I have given seems to be quite simple.
Yes, the Friss equation is a commonly used formula for estimating the strength of a signal at a receiving point regardless of the type of transmission being used. It is often used in radio and wireless communication systems.
The accuracy of the Friss equation depends on several factors such as the distance between the transmitting and receiving points, the frequency of the signal, and any obstacles or interference in the transmission path. In general, it is considered a reliable method for estimating field strength within a certain range of conditions.
Yes, the Friss equation can be used for both near-field and far-field calculations, although it may be less accurate in the near-field region. For more accurate results in the near-field, additional calculations may be needed to account for factors such as antenna sizes and orientations.
Yes, the Friss equation can be affected by environmental factors such as atmospheric conditions and terrain. It is important to take these factors into account when using the equation for estimating field strength.
While the Friss equation is a useful tool for estimating field strength, it does have some limitations. For example, it assumes a free space propagation environment and does not take into account factors such as antenna gains and losses. It is important to use the equation in conjunction with other methods and consider any relevant factors for more accurate results.