RF Directional Couplers
This family of directional couplers are all based on a balanced bridge design. They are used to monitor the RF power traveling along a transmission line by taking a small sample of it. Due to their directional characteristics, they can measure both incident and reflected power.
Their bridge-based design gives them a very wide bandwidth (from a few 'MHz's to many 'GHz's) while having a high directivity. The latter is a measure of the accuracy with which the coupler can take a power sample from the transmission line.
Directional couplers can be found in many RF systems. For example, in systems that measure RF power, in so-called 'VSWR bridges' that measure an impedance mismatch (of an antenna for example) and you also find them in the test sets of VNAs.
Their bridge-based design gives them a very wide bandwidth (from a few 'MHz's to many 'GHz's) while having a high directivity. The latter is a measure of the accuracy with which the coupler can take a power sample from the transmission line.
Directional couplers can be found in many RF systems. For example, in systems that measure RF power, in so-called 'VSWR bridges' that measure an impedance mismatch (of an antenna for example) and you also find them in the test sets of VNAs.
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