Fluorescence Thermography for High-Resolution Characterization of Transmitarray Antenna in X Band

Rapid advances in microwave technologies necessitate accurate electromagnetic (EM) field measurement, especially for optimizing communication systems. Visualizing entire field distributions with high spatial fidelity is vital for enhancing antenna performance in satellite communications and SG networks. This study investigates fluorescence thermography using rhodamine B (RhB) coated films for non-intrusive, high-resolution characterization of EM fields, focusing on an X-band Transmitting Array (TA) antenna. Experimental results exhibit efficient field focusing, distinct high-intensity regions, and sidelobe suppression, aligning with theoretical expectations. Fluorescence thermography could therefore be a valuable tool for antenna designers, enabling understanding of complex field interactions without disturbing the reactive environment. This work validates the method as a complement to conventional EM field characterization and underscores its potential for driving next-generation telecommunication technologies.