The relation between equispaced antenna array and finite impulse response (FIR) filter of signal processing is first revealed. As a kind of FIR filter, window functions are introduced for antenna design. The new approach is simpler and more efficient than the traditional polynominal methods.
"Antenna array design using window function", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 192941 (14 December 1992); doi: 10.1117/12.2298262; https://doi.org/10.1117/12.2298262