The WC-090-D3-SF is a high-precision microwave Waveguide to Coaxial Adapter professionally engineered for strict adherence to the rectangular WR-90 architectural standard in a specialized 1/2 Height layout. Operating continuously across the 8.2 GHz to 12.4 GHz X-Band spectrum, this premium compact "Type D3" transition component ensures stable electromechanical coupling and maximum energy transfer with a low maximum V.S.W.R profile of 1.3 : 1. Manufactured from high-grade aluminum alloy via advanced CNC machining in Taiwan, this ultra-lightweight 26.6 g adapter features a standardized square UG-39/U Style cover flange layout, mated to a high-durability coaxial SMA-Female connector port, safely managing continuous wave power loads up to 300 Watts (CW). This reduced height design minimizes physical volume and weight strain, rendering it the definitive choice for space-constrained RF path integration, weight-sensitive airborne radar arrays, mobile satellite communication enclosures, wireless testing chambers, and mission-critical laboratory calibration setups.