6dB Coupler
The core feature of an RF coupler is its ability to selectively couple a small portion of signal power from the main transmission path at a specific ratio for monitoring or processing, while ensuring minimal loss in the main signal’s passage. It is a critical component for achieving RF signal sampling and monitoring.
The core feature of an RF coupler is its ability to selectively couple a small portion of signal power from the main transmission path at a specific ratio for monitoring or processing, while ensuring minimal loss in the main signal’s passage. It is a critical component for achieving RF signal sampling and monitoring.
If further breakdown is required, its core features include:
Directional coupling: Its most fundamental characteristic is its ability to distinguish between forward and reverse signals and output them separately from the coupling port and the isolation port.
Power sampling/monitoring: The primary function is to non-invasively extract a small portion of energy from the main signal path (typically at levels such as -10 dB, -20 dB, etc.) for monitoring power, frequency, or signal quality.
Low insertion loss: Ensures that the main path signal experiences minimal loss when passing through the coupler.
Key performance parameters:
Coupling degree: The ratio of the output power at the coupling port to the input power of the main line, which determines the strength of the sampled signal.
Directivity: The ability to distinguish between forward and reverse waves is a key metric for evaluating the performance of a coupler; the higher the directivity, the better.
Isolation: The amount of attenuation between the input and the isolated side.
Widely used: primarily for transmitter power monitoring, antenna VSWR measurement, feedback control loops, and as a core component in certain measuring instruments.
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