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{"ops":[{"insert":"A)you may have noticed that many trucks have to be identical verticaly oriented antenae: One mounted on each side of the driver cab. Suppose that two such dipole antennae separated by a distance of  l= 3 m are driven by identical currents I"},{"attributes":{"script":"sub"},"insert":"0"},{"insert":"e"},{"attributes":{"script":"super"},"insert":"(-2(pi)jft"},{"insert":"  with f =27 MHz. What is the intensity of radiated power in the plane normal to and through the middle of of the antena as a fuction of an angle ?what is the patern if the antenna are driven exactly Pi radius out of phase ? How do you think antena on the truck are driven and why?\n\nB) Suppose that three identical vertically oriented dipole antenna are aranged in a line .For definteness, let the first be at the origin, the second be at (x,y,z) =(a,0,0) and the third be at at (x,y,z) =(2a,0,0) Assume that the  first is driven by the curent I"},{"attributes":{"script":"sub"},"insert":"0"},{"insert":"e"},{"attributes":{"script":"super"},"insert":"-jwt   "},{"insert":"the second by I"},{"attributes":{"script":"sub"},"insert":"0"},{"insert":"=e"},{"attributes":{"script":"super"},"insert":"-j(wt+pi\/2) "},{"insert":" and the third by I"},{"attributes":{"script":"sub"},"insert":"0e"},{"attributes":{"script":"super"},"insert":"-j(wt-Pi\/2)."},{"insert":" Asume that the antenne are each small compared to a wavelength a (e.g Lambda\/8 , lambda\/4, 3lambda\/8 , and lambda \/2. Note how the radition is focused in one . \n \n\n\n\n\n\n"}]}

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