RF coupler
An RF coupler is a passive device that may be used to control the amplitude and direction of radio frequency signals in a transmission path between circuit modules. An RF coupler may commonly be configured as a stripline coupler, or a microstrip coupler. Directional couplers include parallel microstrip conductors mounted on a dielectric, and are commonly referred to as microstrip couplers. Microstrip couplers are often used in connection with signal sampling (power monitoring), signal splitting and combining, signal injection and other applications. A directional coupler is a measurement tool that samples a small portion of radio frequency and microwave energy traveling through a coaxial cable. A stripline coupler comprises generally two parallel strips of metal on a printed circuit board. A stripline coupler ordinarily functions as an RF signal attenuator for generating a controlled amount of signal power transfer from one transmission path to another to provide one or more reduced amplitude RF signals.
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