Straight SMP In-Line Adapter, 50 Ohm to 40 GHz
The Amphenol SMP-FS2A-1259 is a straight, in-line SMP to SMP adapter — plug on both ends, female centre contacts on both sides. It is a same-series conversion adapter, meaning it joins two SMP male cable ends or panel jacks without changing the interface. Rated for 50 Ohm systems, it holds a 40 GHz maximum frequency, making it suitable for high-speed digital or microwave signal paths up through Ka-band. The snap-on fastening on both ends gives a quick, positive mate that releases with a straight pull — no coupling nut to turn. With 100 mating cycles, it is built for test setups, break-out boxes, or semi-permanent interconnects where the adapter stays in place for a series of connections.
40 GHz Bandwidth and 50 Ohm Impedance
The 40 GHz frequency ceiling means this adapter passes signals from DC through the full microwave range without a resonant dip inside the passband. The 50 Ohm impedance matches the standard for RF test equipment, spectrum analysers, and most microwave cabling — no impedance step to cause a reflection. The PTFE dielectric keeps the dielectric constant stable across the temperature range, so the electrical length does not drift with ambient heat.
100 Mating Cycles and Snap-On Retention
The 100-cycle rating is typical for an SMP snap-on interface — the spring fingers in the female contact wear with each mate, and the gold plating on both the body and centre contact resists corrosion through those cycles. The snap-on, snap-on fastening on both ends means each side locks with an audible click and releases with a firm axial pull. No tool is required for mating or unmating, which speeds up reconfiguration in a test harness. The free-hanging, in-line mounting lets the adapter float in the cable run without a panel cutout.