Insulated Wire Inc
Products: High Performance Microwave Coaxial Cables.

Spectrum Elektrotechnik GmbH
Products: Microwave passive components: Adapters, Phase shifters, Connectors etcetera.

Harbour Industries
Products: Rf and Microwave coaxial cables.

Haverhill Cable Manufacturing Corporation
Products:  Semi-rigid coaxial cables
Diconex SA

Products: Microwave Passive Components - Attenuators - Attenuator Chips - Terminations and Loads.