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The WCA 22 from Microwave Filter Company is a Waveguide to Coax Adapter with Frequency 33 to 50 GHz. More details for WCA 22 can be seen below.
1.85mm, 2.4mm and 2.92mm Waveguide to Coax Adapters Operating Up to 65GHz
You can now find similar products from multiple companies on everything RF.