Can anybody give a definition of, and how to calculate critical wavelength and freq of a phased array radar?
Answer:
I'm not used to seeing the expression "critical frequency" or "critical wavelength" used in this context. I'm wondering if you are thinking of the point at which the elements of the array are resonant?
Like any fixed frequency system built of dipole antennas (and that's one way you can build such an array -- there are several), the dipoles will be resonant when cut to
feet = 468 / MHz
So let's say we have an phased array operating at a 3GHz (10cm wavelength). At 3GHz, a dipole would be resonant if it were cut to 1.872 inches.
You would reverse the equations from the known antenna length to determine the frequency or wavelength.
MHz = 468 / dipole length in feet
and of course, you compute wavelength in cm from MHz as
wavelength = 29,979,245,800 / frequency
The 3GHz example comes out to about 10cm, typical for an array of this type.
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