《微波仿真论坛_定向耦合器和3DB电桥综述》.pdf

Application Note RF Directional Couplers and 3dB Hybrids Overview M560 V2.00 Directional Couplers coupler”, “90° hybrid”, and “180° hybrid” is based • For providing a sample of the power propagating in on convention. However, the 90° and 180° hybrids one direction on a transmission line. could be thought of as 3 dB directional couplers. Despite these similarities, the parameters used to describe signal flow in directional couplers and the 3dB Hybrids application, in actual use, is sufficiently different to • For dividing a signal into two signals of equal warrant separate considerations. amplitude and a constant 90° or 180° phase differential. • For quadrature combining or performing 180° Hybrids Functional Description summation/differential combining. A 180° hybrid is a reciprocal four-port device which provides two equal amplitude in-phase signals when fed from its sum port () and two equal amplitude 180° I