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Antenna Factor Formula:
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Antenna Factor (AF) is a parameter that represents the relationship between the electric field strength incident on an antenna and the voltage output from the antenna. It is commonly used in electromagnetic compatibility (EMC) testing and RF measurements.
The calculator uses the Antenna Factor formula:
Where:
Explanation: The formula calculates how much the antenna converts the incident field strength to a voltage at its terminals, with higher values indicating less efficient reception.
Details: Accurate antenna factor calculation is crucial for precise electromagnetic field measurements, EMC compliance testing, and antenna calibration. It allows engineers to convert measured voltages to actual field strengths.
Tips: Enter frequency in MHz and antenna gain in dBi. Frequency must be a positive value. The result will be in dB/m (decibels per meter).
Q1: What is the typical range of antenna factor values?
A: Antenna factor values typically range from 10 to 50 dB/m, depending on frequency and antenna design.
Q2: How does antenna gain affect the antenna factor?
A: Higher antenna gain results in a lower antenna factor, meaning the antenna is more efficient at converting field strength to voltage.
Q3: Why is the constant 29.79 used in the formula?
A: The constant 29.79 comes from the relationship between field strength and received power in free space, accounting for the impedance of free space (377Ω).
Q4: Can this formula be used for all antenna types?
A: This formula provides a good approximation for many antenna types but may need adjustment for specific antenna designs or measurement conditions.
Q5: How accurate is this calculation?
A: The calculation provides a theoretical value. For precise measurements, calibrated antenna factors provided by manufacturers should be used.