1. FMAT7611-12 Substitution Conclusion Based on core electrical parameters (12 dB attenuation, DC–18 GHz frequency range, 2 W power handling, 50 Ω impedance) and physical packaging (SMA inline module), the FMAT7611-12 is identical to the original part SA18E-12, making direct substitution technically feasible. The key difference lies in the connector designation in the part description: the original part is explicitly specified as “PLUG‑JACK” (i.e., one male, one female), whereas the FMAT7611-12 is only described as “SMA MALE.” This could indicate a male‑to‑male configuration or an incomplete description. If the connector gender arrangement of the FMAT7611-12 differs from that of the original part, direct physical connection to the same interfaces will not be possible. Adapters or changes to the link configuration would then be required, introducing additional insertion loss and potential mismatch risks, especially at high frequencies up to 18 GHz, which may degrade system performance. Until the actual interface configuration is confirmed as male‑female, the substitution remains uncertain.