A radar for tracking aircraft broadcasts at 12 GHz microwave beam from a 2.0-m-diameter circular radar antenna. From a wave perspective the antenna is a circular aperture through which the microwaves diffracts. A. what is the diameter of the radar beam at a distance of 30 km? B. if the antenna emits 100 kW of power what is the average microwave intensity at 30 km?

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ramirezhereva · Accepted Answer

b) The average microwave intensity is,  I=PA  =Pπr2  =4Pπd2  =4(100×103 W)π(915 m)2  =0.152 Wm2

RizerMix · Accepted Answer

a) The wavelength of the wave is, λ=cf =3×108 m/s12×109 Hz =0.025 m =25 mm The angular resolution of the system is, sin⁡θ=1.22(λD) =1.22(25 mm2 m) θ=sin−1⁡(0.01525) =15.25 mrad The diameter of the radar beam from the half angle is, d=2(15.25 mrad)(30 km(1000 m1 km)) =915 m

alenahelenash · Accepted Answer

Refer to this one, they&#039;re both correct!

A radar for tracking aircraft broadcasts at 12 GHz microwave beam from a 2.0-m-diameter circular...

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