PMI's 3 dB, 90° Quadrature Couplers are available in bandwidths of 2.0 to 4.0 GHz, 2.5 to 5.0 GHz, 4.0 to 8.0 GHz, 5.0 to 10.0 GHz, 6.0 to 12.0 GHz and 8.0 to 18.0 GHz. They are designed for low insertion loss, low VSWR, excellent phase and amplitude balance. These are packaged in a small size.