“…However, the measured central frequency (4.75 GHz) is lower by approximately 1.2% than the simulated one (4.8 GHz). This shift can be attributed to fabrication tolerances, connectors, and the substrate properties [27][28][29][30][31]. The measured return loss is below −36 dB, and the measured insertion loss, at each branch, is approximately −3.2 dB at the central frequency.…”