The QH-0R518 from Marki Microwave is a multi-purpose broadband 3dB Quadrature Hybrid Coupler that operates from 0.5 to 18 GHz. The coupler has an isolation of 20 dB, amplitude balance of 0.5 dB and phase balance of +/- 3 degrees. It is available in a module with SMA connectors. The coupler can be used in a wide range of applications including single sideband upconverters, image rejection downconverters, IQ modulators, balanced amplifiers, microwave correlators and microwave Butler matrices.
