Coaxial Adapter, 3.5 mm (m) to 3.5 mm (f), DC to 26.5 GHz
83059C - Keysight Technologies
The Keysight 83059C instrument-grade 3.5-mm coaxial adapter offers outstanding performance to 26.5 GHz. With SWR typically better than 1.05, this adapter is ideal for most connector saver and interconnect needs.