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Bi-directional Couplers

Bi-directional couplers sample forward and reverse RF power in the same transmission path, usually through separate coupled ports. They are used when delivered and reflected power must be monitored together in amplifiers, antenna feeds and RF tests.

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Bi-directional Couplers

Articles

RF power divider and coupler hardware connected in a microwave measurement setup
RF Power Distribution EngineeringHow to Select RF Power Dividers, Combiners and Directional Couplers

A practical method for choosing RF dividers, combiners and directional couplers from signal-flow purpose, topology, frequency range, balance, isolation, directivity, match and real power conditions.

FAQ

What is the difference between an RF power divider and a directional coupler?

A divider creates two or more controlled output paths, while a directional coupler samples a defined fraction of a travelling wave and preserves a main through path.

How do coupling factor, directivity and return loss affect forward and reflected-power accuracy?

Coupling factor sets the sampled level, directivity limits separation of forward and reverse waves, and return loss determines how strongly the coupler and its interfaces disturb or re-reflect the signal. Detector accuracy alone cannot define the accuracy of a forward/reflected-power measurement.

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Bi-directional Couplers

A bi-directional coupler measures energy travelling in both directions on an RF line. It provides separate information for forward and reflected power so the system can observe delivered power and load mismatch from the same installed component.

System role

These couplers are used in power amplifier protection, antenna matching checks, transmitter telemetry, load monitoring and RF benches that need both forward and reverse readings.

Engineering factors

  • Forward and reverse coupling values must remain predictable over the operating band.
  • Directivity separates the sampled waves and affects reflected-power accuracy.
  • Insertion loss, isolation, power rating and connector format define the through path limits.