1- A 5-element uniform linear array with inter-element spacing of λ/2 is to have maximum radiation in the direction θ=60° , find the current phases , find the directions of null radiation , hence sketch the radiation pattern , find also the relative side lobe level .
2- Design a linear broadside array to have nulls along the directions θ = 50°,130°, and 0° , namely find the number of elements , and the relative currents , find the beamwidth to nulls and the side lobe level .
3- Design a V antenna with arm length L=6λ at the frequency 18 MHz , namely find the V angle in degrees , find the beamwidth between nulls.
if the frequency changes to 12 MHz , by how many degrees will the peak radiation direction rotate ?