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Antenna & Wave Propagation Free-Space Path Loss

In free space, if frequency is doubled while distance and antenna gains in dBi remain unchanged, free-space path loss increases by approximately?

A3 dB
B6 dB
C12 dB
D20 dB

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Correct Answer: B. 6 dB

Explanation: FSPL is proportional to f², so doubling frequency adds about 6.02 dB of loss for fixed distance and antenna gains.

Reference: Standard antenna and wave propagation: free-space path loss

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