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The
limiting factor for most Wilkinson power dividers used as combiners is
power dissipation. When input signals are out of phase, non-coherent or
have amplitude unbalance this causes a cancellation across the isolation
resistors resulting in power dissipation.
Since these devices are most commonly used as
dividers, typical industry designs utilize low power alumina surface
mount resistor chips on a thermally insulative circuit board. However,
maximum input for combining non-coherent signals on adjacent ports is:
(rated input power of divider * 5%) / "N" # of
input channels. If the rated power is exceeded, the chip resistors will
heat up and degrade resulting in loss of port-to-port isolation and
VSWR.
For higher power combining applications, check out the 80 & 100 watt H-Series Combiners & Dividers.