This study designed and fabricated a frequency-selective structure-based security paper for the electromagnetic detection system of a security gate. which aims to prevent leakage of confidential documents. When a functional paper embedded with a frequency-selective pattern that selectively reflects a specific frequency is being leaked out of a security zone. the electromagnetic detect... https://www.lightemupsequences.com/limited-save-Custom-Congratulations-Banner-p4839-hot-choice/