Antenna & Wave Propagation Quiz 2

If the path difference of two waves with single source traveling by different paths to arrive at the same point, is λ/2, what would be the phase difference between them?

For a endfire array consisting of several half wave length long isotropic radiators is to have a directive gain of 30. Find the array length and width of major lobe.

Calculate the directivity of a given linear broadside , uniform array of 10 isotropic elements with a seperation of λ/4 between the elements. (Take the approximate expression)

A uniform linear array consists of 16 isotropic point sources with a spacing of λ/4, if the phase difference δ=-90°, Calculate a) HPBW b) Directivity (c) Effective Aperture (use the exact expression of length of array)

Design a 7 element broadside array off isotropic sources of λ/2 spacing between elements. The pattern is to be optimum with a side lobe level 19.8 dB down the main lobe maximum.