Millimeter-wave radar generates a narrower beam than conventional microwave radar, making it less vulnerable to antiradar missilesthan conventional radar. (a) Calculate the angular width 20 of the central maximum, from first minimum to first minimum, produced bya 220 GHz radar beam emitted by a 54.0-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 diameter of 1.64 m and emits at awavelength of 1.6 cm?

Given:(a) For the millimeter-wave radar antenna, Diameter of the circular antenna, d = 54.0 cm =…

Answered: Millimeter-wave radar generates a…

Similar questions

Please type the answer instead of hand writting
S1 and S2 in the figure below are effective point sources of radiation, excited by the same oscillator. They are coherent and in phase with eachother. Placed a distance d=4.17m apart, they emit equal amounts of power in the form of 1.06m wavelength electromagnetic waves. (PHYS 1801 CL06) (a) Find the positions of the first, second, and third maxima of the received signal, as the detector D is moved along the x axis starting at 0. (b) Write an equation that you could use to find the location of any minima and find the position of at least one minimum on the x axis. y S2 d D x- 's ]o
Very short pulses of high-intensity laserbeams are used to repair detached portions of the retina of the eye. Thebrief pulses of energy absorbed by the retina weld the detached portionsback into place. In one such procedure, a laser beam has a wavelengthof 810 nm and delivers 250 mW of power spread over a circularspot 510 mm in diameter. The vitreous humor (the transparent fluid thatfills most of the eye) has an index of refraction of 1.34. What average pressure would the pulse of the laser beam exert at normal incidence on a surface in air if the beam is fully absorbed?
Large radio telescopes, like the one in Arecibo, Puerto Rico, can detect extremely weak signals. Suppose one radio telescope is sensitive enough to detect a signal which lays down only 0.87 pW of power on an area of 6.8 x 10¹5 m². (a) What would be the total power that would be received by the antenna, assuming that its diameter is 350 m? (b) What would be the power of a source at 26000 ly distance from Earth that could provide such a signal? A light-year is the distance light travels in one year. (a) Number i (b) Number Save for Later Units Units Attempts: unlimited Submit Answer