ABSTRACT In this letter, a layered multifunctional tri‐band reflect‐transmit‐array (RTA) with quad‐beam control is reported. The unit adopts a multi‐layer structure and integrates frequency selective surfaces (FSS) to effectively isolate distinct frequency bands. Through a strategic combination of continuous phase (C.P.) and 1‐Bit phase distributions, it achieves precise control over four independent beams. The performance of the proposed RTA was verified through simulation, fabrication, and mea