1.In a microwave system, it is often necessary to divide one channel of microwave power into several channels in proportion, which is the problem of power distribution. The components that realize this function are called power distribution components, mainly including directional coupler, power divider and various microwave branch devices. These components are generally linear multi-port mutual instrument networks, so microwave network theory can be used for analysis. Directional coupler is a four-port element with directional transmission characteristics. It is composed of two pairs of transmission systems connected by coupling devices.
2.The classification is based on the coupling output direction, including co-directional coupler and reverse directional coupler. According to its transmission type, it can be divided into waveguide directional coupler, coaxial directional coupler, stripline or microstrip directional coupler. According to their coupling strength, they can be divided into strong coupling directional couplers and weak directional couplers. Generally, directional couplers such as 0dB and 3dB are strong couplers, directional couplers such as 20dB and 30dB are weak directional couplers, and directional couplers with a diameter of dB are medium coupling directional couplers. According to their bearing power, they can be divided into low power directional couplers and high power directional couplers. According to the output phase of the device, there is a 90 ° directional coupler.
3.Performance index Performance index of directional coupler: coupling degree isolation degree orientation degree input standing wave ratio working bandwidth
Post time: Feb-10-2023