generate questions: The radiation of many antennas shows a pattern of maxima or "lobes" at various angles, separated by "nulls", angles where the radiation falls to zero. This is because the radio waves emitted by different parts of the antenna typically interfere, causing maxima at angles where the radio waves arrive at distant points in phase, and zero radiation at other angles where the radio waves arrive out of phase. In a directional antenna designed to project radio waves in a particular direction, the lobe in that direction is designed larger than the others and is called the "main lobe". The other lobes usually represent unwanted radiation and are called "sidelobes". The axis through the main lobe is called the "principal axis" or "boresight axis".
What is the term that refers to areas where an antennas radiation is zero? {sep_token} What do radio waves do that account for maxima or nulls in an antenna pattern? {sep_token} If you desired to project radio waves to the south, what part of the antenna would you build larger in that direction? {sep_token} What is the main distinction of side lobes?