Electromagnetic couplers for multi-frequency power detection

A multi-output electromagnetic coupler comprising:

• a main coupler transmission line extending between and electrically connecting an input port and an output port;
• a first coupled line section configured to couple electromagnetic power in a first frequency band from the main coupler transmission line to provide a first coupled output signal at a first coupled port;
• a second coupled line section configured to couple electromagnetic power in a second frequency band from the main coupler transmission line to provide a second coupled output signal at a second coupled port simultaneously with the first coupled output signal being provided at the first coupled port;
• and
• a diplexer connected to the first and second coupled ports and configured to direct the first and second coupled output signals to a common coupled output port.

A system comprising:

• a transceiver configured to produce an electromagnetic transmit signal;
• a multi-output electromagnetic coupler including a main coupler transmission line extending between and electrically connecting an input port and an output port, the multi-output electromagnetic coupler being configured to receive the electromagnetic transmit signal at the input port, the multi-output electromagnetic coupler further including a first coupled line section configured to couple electromagnetic power in a first frequency band from the main coupler transmission line to provide a first coupled output signal at a first coupled port of the multi-output electromagnetic coupler, a second coupled line section configured to couple electromagnetic power in a second frequency band from the main coupler transmission line to provide a second coupled output signal at a second coupled port of the multi-output electromagnetic coupler simultaneously with the first coupled output signal being provided at the first coupled port, and a plurality of switches configured to selectively connect an end of the first coupled line section to a termination impedance in a first mode of operation, to the first coupled port in a second mode of operation, and to an end of the second coupled line section in a third mode of operation, each of the selective connections being mutually exclusive of the other selective connections;
• and
• an antenna switch module configured to connect the transceiver to the multi-output electromagnetic coupler and to direct the electromagnetic transmit signal to the input port of the multi-output electromagnetic coupler.