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The WCA 42 from Microwave Filter Company is a Waveguide to Coax Adapter with Frequency 18 to 26.5 GHz. More details for WCA 42 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.