This article explores the design, modeling, and experimental validation of passive antenna arrays (AAs) tailored for unmanned aerial vehicle (UAV) communication systems. Focusing on the technical composition and functionalities of various types of passive antenna arrays, the study delves into different antenna elements that comprise these arrays, discussing their integration into comprehensive systems. Through rigorous modeling aimed at predicting performance in diverse operational conditions and backed by experimental studies, the paper provides practical insights for the development and optimization of AAs. These passive systems leverage the collective strength of multiple antennas to form directed beams, enhancing signal clarity and reducing interference, thereby supporting robust communication links essential for UAV operations.