Effects of modulated spacing on the radiation patterns

It has been demonstrated that it is possible to thin an array as well as to improve radiation pattern characteristics with an appropriate spacing function. A study is carried out to analyze the effect of thinning by considering a modulated spacing function. Using a specified spacing function, radiation patterns are evaluated for array lengths of 50, and number of elements equal to 80 and 100. It is found that the near-in-sidelobe level is reduced for a modulated spacing function and that the main beam width is found to remain constant. These advantages are not found in the case of uniform spacing. Even after thinning the array, the modulated spacing function is found to improve the overall radiation pattern characteristics.<>