About RF Waveguide Isolators and Circulators
RF waveguide isolators and circulators permit a signal to pass in one direction while providing high isolation to reflected energy in the reverse direction. RF waveguide circulators are passive devices with three or more ports. General specifications for RF waveguide isolators and circulators include waveguide material and waveguide cross section. Common materials for RF waveguide isolators and circulators are aluminum, brass, bronze, copper, and silver. Typically, the waveguide cross-section is rectangular, elliptical or circular.
RF waveguide isolators and circulators differ in terms of operating frequency, EIA waveguide size, and VSWR. Operating frequency is the range of frequencies over which products meet all guaranteed specifications. Typically, the Electronic Industry Alliance (EIA) approves sizes for RF isolators and circulators. Voltage standing wave ratio (VSWR), a unit-less ratio ranging from one to infinity, expresses the amount of reflected energy at the input or output of a RF waveguide isolator or RF waveguide circulator. A value of one indicates that all of the energy will pass through. Any other value indicates that a portion of the energy will be reflected.
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