The WC-090-PBR-A2-NF is a laboratory-grade microwave Waveguide to Coaxial Adapter professionally engineered for strict adherence to the rectangular WR-90 architectural standard. Operating continuously across the 8.2 GHz to 12.4 GHz X-Band spectrum, this premium transition component ensures stable electromechanical coupling and maximum energy transfer with an exceptionally low nominal V.S.W.R profile of 1.3 : 1. Manufactured from high-grade aluminum alloy via precision CNC machining in Taiwan, this robust 85 g adapter features a standardized square UG-39/U (PBR Style) flange interface with an integrated gasket groove for pressurization support, mated to a high-durability coaxial N-Female connector port, safely managing continuous wave power loads up to 300 Watts (CW). This specialized configuration is essential for pairing with professional waveguide systems and standard gain horn antennas in EMI/EMC testing, laboratory measurement ranges, wireless testing chambers, and mission-critical Signal Defense calibration environments.