Innovative CMOS-Enabled Retrodirective Array Facilitates Two-Way Wireless Communication with Automated Beam Tracking

Researchers from Southeast University and Purple Mountain Laboratories have developed an innovative retrodirective array (RDA) system capable of two-way wireless communication with automatic beam tracking, enabled by advanced CMOS chips. Unlike traditional arrays that rely on complex phase-shifting techniques, this new RDA autonomously detects incoming signals and redirects them back to the source without prior source location knowledge, all while avoiding the need for intensive digital signal processing. The breakthrough lies in the integration of a specially designed CMOS chip that incorporates both receiving and transmitting chains, along with a unique tracking phase-locked loop (PLL) for conjugated phase recovery. Each chip measures 4.62 mm², consumes only 0.15 W, and was tested successfully in indoor environments, demonstrating beam tracking within an 80° coverage zone. This compact, low-power design marks a significant step toward practical, real-time beam steering solutions for mobile communications, with potential applications at higher frequency bands. This pioneering work offers promising prospects for enhancing the efficiency and reliability of future wireless systems,...