Founded in 1990, SEI is located in California, USA and is a a wholly owned subsidiary of Senah Incorporation, a California corporation. It manufactures Castings, Microwave & RF Components, Connectors, and Adapters. 

SEI specializes in manufacturing ferrite components, antennas, RF connectors and adapters.

The product list includes the following:

• RF & Microwave Connectors SMA, SMB, SMC, N, L9, L29, 7/16, MCX, MMCX, SMP, SSMA, SSMB, TNC, 2.4mm, 35mm

• Adapters
• Aluminum Cast and Machined Boxes A, B, C, D, E, K, TETV, X and Z series 
• Attenuators
• Terminations & Loads
• Ferrite Isolators & Circulators
• Power Dividers & DC Blocks
• GPS & GSM Antennas
• Coaxial to Waveguide adapters 
• Cable Assemblies