B. A. Atsuwe, A. N. Amah, G. A. Igwue, and I. Ahemen, “OPTIMIZED EIGHTH-ORDER ACTIVE-R BANDPASS FILTER FOR UHF RFID SYSTEMS: DESIGN, SIMULATION, AND EXPERIMENTAL VALIDATION”, FJS, vol. 9, no. 2, pp. 271 - 284, Mar. 2025.