Extra exam question E9E11

WhyUsing multiple driven elements connected through phasing lines lets an operator control the antenna's radiation pattern. Connecting multiple driven elements through carefully designed phasing lines lets an operator control the antenna array's overall radiation pattern, shaping where the combined signals reinforce and where they cancel, the whole point of building a phased array in the first place, answer A. It isn't there to prevent transmitter harmonic radiation, doesn't let a single-band antenna operate on other bands, and while phased arrays are sometimes used to achieve low-angle patterns, that's a specific application of pattern control, not the general purpose of phasing lines themselves.