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Beamwidth Formula:
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Antenna beamwidth is the angular width of the main lobe of the antenna radiation pattern, typically measured between the half-power (-3 dB) points. It indicates how directional an antenna is and how well it can focus energy in a particular direction.
The calculator uses the beamwidth formula:
Where:
Explanation: The formula provides an approximation of the half-power beamwidth for parabolic and other high-gain antennas, showing the inverse relationship between gain and beamwidth.
Details: Understanding antenna beamwidth is crucial for antenna system design, link budget calculations, interference analysis, and proper antenna alignment in wireless communication systems.
Tips: Enter the antenna gain in dBi (decibels relative to an isotropic radiator). The gain value must be greater than 0 for valid calculation.
Q1: What is the relationship between gain and beamwidth?
A: Higher gain antennas have narrower beamwidths, meaning they are more directional and focus energy in a smaller angular area.
Q2: Is this formula accurate for all antenna types?
A: This formula provides a good approximation for parabolic and other high-gain directional antennas, but may be less accurate for omnidirectional or specially designed antennas.
Q3: What are typical beamwidth values?
A: Beamwidth varies widely depending on antenna type and gain. High-gain antennas might have beamwidths of 10-30 degrees, while lower gain antennas can have 60-120 degrees or more.
Q4: How does beamwidth affect wireless system performance?
A: Narrow beamwidth provides better signal focus and rejection of interference but requires more precise alignment. Wider beamwidth offers broader coverage but with less gain.
Q5: Can I calculate gain from beamwidth using this formula?
A: Yes, the formula can be rearranged to calculate gain from beamwidth: \( Gain = \frac{41253}{Beamwidth^2} \)