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aashna
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Can we apply friss equation to find field strength at the receiving point for space wave propagation?
Can we apply Friss equation to find field strength at the receiving point....
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Discussion Overview
The discussion centers around the application of the Friis equation to determine the electric field strength at a receiving point for space wave propagation. Participants explore the relationship between the Friis formula, path loss, and field strength, as well as alternative formulas for calculating electric fields from antennas.
Discussion Character
- Technical explanation
- Debate/contested
Main Points Raised
- Some participants question whether the Friis equation can be used to find field strength directly, noting that it primarily provides path loss between antennas in free space.
- One participant suggests an alternative formula for radiation from a dipole in free space, indicating that it can be used to calculate electric field strength under certain conditions.
- Another participant argues that the Friis equation can lead to the calculation of received power, which can then be related to electric field strength through the Poynting vector and effective aperture.
- Concerns are raised about the applicability of the Friis equation for propagation over ground and the need to consider factors like gain and ground reflection.
Areas of Agreement / Disagreement
Participants generally agree that the Friis equation does not directly provide field strength, but there is disagreement on whether it can be used to derive electric field strength through related calculations. Multiple views on the applicability of the equation and alternative methods remain unresolved.
Contextual Notes
Limitations include the dependence on specific conditions such as free space versus ground propagation, and the assumptions involved in using the Poynting vector and effective aperture in calculations.