Systems and Methods for RF Energy Multiplexers are provided. In one embodiment, a multiplexer comprises: a multiplexer stage that includes: a first three port device coupled to a first port of the multiplexer and a first reflective filter, wherein the first reflective filter has a pass band that passes energy at a first frequency, and reflects energy at at least one of a second frequency outside of the pass band back into the first three port device; and a first filtered-load sub-stage coupled to the first three port device, the sub-stage comprising a second three port device coupled to a second reflective filter and a first absorbing load, where the second reflective filter passes energy at the first frequency to the first absorbing load and reflects energy at the at least one of a second frequency outside of the first pass band back into the second three port device.