Radio frequency multiplexer

A radio frequency (RF) multiplexer for routing transmit signals to an antenna and routing receive signals to a receiver, the multiplexer comprising:

• a first hybrid coupler providing four ports, a first port configured to connect to an antenna, a second port being an input port and configured to receive an N-band transmit signal;
• a first M-band splitter connected to a third port of the first hybrid coupler, the first M-band splitter having a first set of M outputs;
• a first set of M amplifying circuits, each having an input port connected to one of the first set of M outputs and configured to produce an amplified output via an output port;
• a second M-band splitter connected to a fourth port of the first hybrid coupler, the second M-band splitter having a second set of M outputs;
• a second set of M amplifying circuits, each having an input port connected to one of the second set of M outputs and configured to produce an amplified output via an output port;
• and
• at least one other hybrid coupler providing four ports, a first port being connected to receive the amplified output of one of the first set of amplifying circuits, and a second port being connected to the amplified output of one of the second set of amplifying circuits, each of the at least one other hybrid coupler having a third port being an output port and configured to output one of M receive signals for one of M receive circuits and a fourth port configured to connect to one of M loads.