Waveguides
Link Microtek

Designs and manufacturers waveguide and coaxial microwave components, assemblies and sub-systems up to 40GHz
Microwave Filters & TVC

Coaxial and waveguide microwave passive components from DC to 90 GHz for telecommunications, space, and defense applications.
Pasternack

Pasternack is able to ship in the same day any Laboratory, RF and Microwave Component: RF Adaptors, Antennas, RF Amplifiers, RF Attenuators, Bias Tees, RF Cable Assemblies, RF Cables, RF Connectors, RF Couplers, DC Blocks, RF Detectors, RF Filters, Frequency Multipliers, Isolators and Circulators, RF Limiters, Matching Pads, RF Mixers, RF Noise Sources, RF Phase Shifters, Phase Trimmers, Power Dividers, RF Surge Protection, RF Switches, RF Terminations, RF Test and Measurement, RF Tools, Waveguides…