Stealth aircraft coating thickness

AI Thread Summary
Stealth aircraft utilize antireflecting coatings to minimize radar reflection, which typically has a wavelength of around 3.0 cm. The thickness of the coating must be such that the reflected signals from the top and bottom surfaces are out of phase, specifically with a path difference of λ/2. Attempts to solve the problem have included searching for relevant equations and testing various formulas, but no successful solution has been found yet. The discussion highlights the challenge of determining the correct thickness for effective stealth functionality. Understanding the relationship between wavelength and coating thickness is crucial for stealth technology.
Galahad43
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Homework Statement



Stealth aircraft are designed to not reflect radar, whose wavelength is typically around 3.0 cm, by using an antireflecting coating. Ignoring any change in wavelength in the coating, estimate its thickness.
____cm

Homework Equations




Well, that's just the issue. I haven't the foggiest idea how to solve this
Maybe something to do with 1/lambda^4?

The Attempt at a Solution



Searched both the book and internet for the relevant equation, and have not been able to find it. Tried just plain 1/lambda^3, didn't work
 
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The antireflecting coating film should by such that signals reflected form top and bosom surface will be out of phase, i.e. the path difference should be λ/2.
Now find the thickness of the film.
 

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