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I am trying to understand the Friis transmission formula: https://en.wikipedia.org/wiki/Friis_transmission_equation From the equation in terms of directivity can we conclude that higher the frequency higher the loss and less energy will receive in the receiving antenna. I assuming this as it is proportional to square of wavelength.

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Yes, , that's what it means assuming Antenna Gains are constant by increasing effective aperture area with wavelength, and wavelength is inverse to f.

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Antenna size explains the "losses". At 10X higher frequency, the quarter-wave antenna interacts with 1/10 * 1/10 smaller region of space, and the energy extracted is 1/100 of the lower frequency.

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