DEFINITIONS:

COUPLING: The difference in power level measured a the coupled port, relative to the power level applied at the input  port or measured at the output port, if specified). Coupling tolerance in this catalog include frequency  sensitivity and therefore show the maximum coupling levels allowable at any given frequency across the  specified operating band.

FREQUENCY SENSITIVITY: The maximum variation in coupling level as measured over a specified frequency band.

TRUE INSERTION LOSS: The difference in the measured power level at the output port of a coupler, relative to the power level applied at the input port, with all other ports adequately terminated. This measurement includes power diverted/lost to the coupler port.

INSERTION LOSS (Excluding Coupled Power): A calculated value indicating power dissipation within the device and not including power routed to other outputs. Typically given for reference only.

DIRECTIVITY: The difference of coupled power levels obtained after applying power through the coupler in both the forward and reverse directions with all other ports adequately terminated.

ISOLATION: (As Referring to power dividing devices) The amount of power reduction measured at any outputport with respect to the power level applied at any other output port with all other ports adequately terminated.

AMPLITUDE BALANCE: The maximum difference in output port phase levels measures at any given frequency in the specified operating band.

PHASE BALANCE: The maximum difference in output port phase levels measured at any given frequency in the specified operating band.

AVERAGE POWER: The maximum calculated average or CW power level, which may be applied at the input of a device without potentially resulting in damage to the device.

REVERSE POWER: The maximum calculated average or CW power level, which may be applied at the output of a device without potentially resulting in damage to the device.

PEAK POWER: The maximum peak power level, which may be applied at the input of a device without potentially resulting in damage to the device. Note the average power level (determined by duty cycle) of a peak power signal must not exceed the “Average Power” rating.

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