1. FMAT7611-40 Substitution Conclusion Based on core electrical parameters—40 dB attenuation, 0–18 GHz frequency range, 2 W power handling, and 50 Ω impedance—as well as the package type (SMA vertical module), the FMAT7611-40 is electrically identical to the original part SA18L-40, providing a foundation for direct substitution. The sole discrepancy lies in the interface gender description: the original part is described as “PLUG‑JACK,” which typically indicates a plug‑to‑jack (male‑to‑female) configuration, whereas the FMAT7611-40 is explicitly listed as “SMA MALE,” meaning both ends are male connectors. If the original circuit design relies on a plug‑to‑jack structure for direct mating, using the FMAT7611-40 with two male ends will prevent physical connection. In such cases, an additional SMA double‑female adapter or a change in the link connector configuration would be required. This introduces extra insertion loss, potential VSWR degradation, and additional connection points.