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Basic elements of RF Directional couplerss and how to use them effectively

A directional coupler is a passive device which pairs part of the transmission power with a known quantity;out through another port, often using two transmissions lines put together tightly enough so that energy passes through one connected to the other.
A directional coupler is characterized by its coupling factor, isolation,and directivity Coupling is not constant but varies with frequency. While different designs can reduce variance, a perfectly flat coupling theoretically cannot be built.Directional couplerss are specified with regard to the coupling accuracy of the frequency band centre. For example, a 10 dB coupling ± 0,5 dB means that the Directional couplers can have 9,5 dB to 10,5 dB coupling in the frequency band centre.The accuracy is due to dimensional tolerances that can be maintained for the distance between the two coupled lines. Another clutch,The specification is frequency sensitivity. A higher frequency sensitivity will allow a larger frequency band of operation.Several quarter-wavelength coupling sections are used to achieve wide frequency bandwidth Directional couplerss. Typical This type of Directional couplers is designed for a frequency bandwidth ratio and a maximum coupling frizz within frequency bands.
Directional coupler is a useful measuring instrument for RF system designers. It not only provides an amplitude-scale image of RF power levels, but also separates the forward and reflected signal components that help characterize the load.
Si Chuan Keenlion Microwave a large selection in narrowband and broadband configurations, covering frequencies from 0.5 to 50 GHz. They are designed to handle from 10 to 30 watts input power in a 50-ohm transmission system. Microstrip or stripline designs are utilized, and optimized for best performance.
We can also customize the rf directional coupler according to your requirements. You can enter the customization page to provide the specifications you need.











Post time: Mar-16-2023