The QH-0440 from Marki Microwave is a 90° Quadrature Hybrid Coupler that operates from 4 to 40 GHz. This 3 dB coupler has an insertion loss of 2 dB and provides isolation of more than 13 dB. It features a multi-section tri-plate stripline design that exhibits an excellent amplitude balance of ±0.4 dB and phase balance of ±5°. The coupler is available in a module with 2.92 mm (female) connectors and is suitable for use in a wide range of applications including single sideband upconverters, image rejection downconverters, IQ modulators, balanced amplifiers, microwave correlators, and microwave Butler matrices.
