How does the gain of a parabolic dish...

Question 1 / 20S9qKywAxVTMvZ4CqRAu8

Question 1 of 20S9qKywAxVTMvZ4CqRAu8

How does the gain of a parabolic dish antenna change when the operating frequency is doubled?

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Question 1 of 20

S9qKywAxVTMvZ4CqRAu8

How does the gain of a parabolic dish antenna change when the operating frequency is doubled?

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🔍 Key Concepts

• Antenna gain vs. effective aperture (area) • How effective aperture depends on wavelength (λ) • What happens to wavelength when frequency is doubled

💭 Think About

• Write the basic relationship between gain, effective area of the dish, and wavelength. How does gain depend on λ? • If frequency doubles, what happens to wavelength? Then, how does that change the gain term that includes λ? • Convert the gain change you found into dB to compare with the answer choices.

✅ Before You Answer

• Confirm that dish physical size (diameter) is held constant when frequency changes. • Verify how wavelength (λ) relates to frequency (f): λ = c / f. • Check how gain scales with (1/λ²) for a parabolic dish, then translate that scaling into dB.

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Question 1 of 20

How does the gain of a parabolic dish antenna change when the operating frequency is doubled?

Gain does not change.

Gain is multiplied by 0.707.

Gain increases 6 dB.

Gain increases 3 dB.

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