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The WR15 WR19 and WR22 waveguide to coax adapters shown below are very high frequency. WR15 transitions to a 1.85mm connector, WR19 transitions to a 2.4mm connector, WR22 to a 2.4mm as well. The WR15 Waveguide to Coax adapters mate with UG385/U Flanges. The WR19 and WR22 Waveguide to Coax adapters mate with UG383/U flanges.