Chapter 36, Problem 031Millimeter-wave radar generates a narrower beam than conventional microwave radar, making it lessvulnerable to antiradar missiles than conventional radar. (a) Calculate the angular width 20 of thecentral maximum, from first minimum to first minimum, produced by a 220 GHz radar beam emittedby a 53.5-cm-diameter circular antenna. (The frequency is chosen to coincide with a low-absorptionatmospheric "window.") (b) What is 20 for a more conventional circular antenna that has a diameterof 1.56 m and emits at a wavelength of 1.6 cm?(a) NumberUnits(b) NumberUnits

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