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directional coupler

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directional coupler [də′rek·shən·əl ′kəp·lər]
(electronics)
A device that couples a secondary system only to a wave traveling in a particular direction in a primary transmission system, while completely ignoring a wave traveling in the opposite direction. Also known as directive feed.

(communications)directional coupler - (tap) A passive device used in cable systems to divide and combine radio frequency signals. A directional coupler has at least three ports: line in, line out, and the tap. The signal passes between line in and line out ports with loss referred to as the insertion loss. A small portion of the signal power applied to the line in port passes to the tap port. A signal applied to the tap port is passed to the line in port less the tap attenuation value. The tap signals are isolated from the line out port to prevent reflections. A signal applied to the line out port passes to the line in port and is isolated from the tap port. Some devices provide more than one tap output line (multi-taps).


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We believe we're truly offering the customer exactly what the market has been asking for: a smaller module that occupies less phone board space with superior efficiency for longer talk-times, all in a form factor that requires no external bypass components, no external Vcc (collector supply voltage) routing and no directional coupler.
By measuring and controlling the transmitted power through a directional coupler, the X-PA is setting the standard for robust VSWR and SAR (specific absorption rate) performance.
RFMD's PowerStar solutions feature integrated power control circuitry, eliminating the need for directional couplers, detector diodes, power control ASICs and other power control circuitry, while providing handset manufacturers the key benefits of reduced component count, improved production yield, simplified phone calibration and faster time-to-market.
 
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