Antenna coupling is a research area that focuses on the interaction between antennas when they are placed close to each other. This phenomenon can result in changes in the behavior and performance of the antennas, including impedance matching, radiation pattern distortion, and reduced efficiency. Researchers in this field study how antennas affect each other when they are placed in proximity, and develop strategies to minimize or optimize these interactions to improve overall system performance. This research is particularly relevant in applications where multiple antennas are used in close proximity, such as in wireless communication systems or radar systems.