In free-space, how does path loss change with distance and wavelength?

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Prepare for the Space Electromagnetic Warfare (SEW) Test 4 Exam. Enhance your knowledge with interactive flashcards and in-depth multiple choice questions. Each question offers valuable hints and detailed explanations to ensure exam readiness.

Multiple Choice

In free-space, how does path loss change with distance and wavelength?

Explanation:
In free-space, path loss follows the Friis transmission relation, where the received power Pr is Pt Gt Gr (λ / (4πR))^2. The path loss, the ratio Pt/Pr, therefore scales as (4πR / λ)^2. This means distance and wavelength affect path loss in opposite ways: increasing distance makes path loss grow with the square of the distance (doubling R adds about 6 dB of loss), while increasing wavelength reduces path loss (doubling λ reduces loss by about 6 dB). So the best description is that path loss increases with distance squared and decreases with wavelength.

In free-space, path loss follows the Friis transmission relation, where the received power Pr is Pt Gt Gr (λ / (4πR))^2. The path loss, the ratio Pt/Pr, therefore scales as (4πR / λ)^2. This means distance and wavelength affect path loss in opposite ways: increasing distance makes path loss grow with the square of the distance (doubling R adds about 6 dB of loss), while increasing wavelength reduces path loss (doubling λ reduces loss by about 6 dB). So the best description is that path loss increases with distance squared and decreases with wavelength.

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