Metamaterial power amplifier systems

A frequency selector, comprising:

• an input port for receiving signals in a plurality of frequency bands;
• an output port for outputting a signal in a predetermined frequency band selected from the plurality of frequency bands;
• a signal path coupling the input port and the output port;
• and
• a TL having a first end and a second end, the first end being an distal end of the TL and the second end being an proximal end coupled in shunt to the signal path;
• wherein
• the TL is configured to have a phase response that provides an open circuit at the second end for the predetermined frequency band and a shorted circuit at the second end for frequency bands different from the predetermined frequency band;
• the TL comprises a CRLH structure and is configured based on the CRLH structure to have the phase response that provides one of 0°±(k×180°), where k=0, 1, 2, . . . , for the predetermined frequency band and one of 90°±(k×180°), where k=0, 1, 2, . . . , for the frequency bands different from the predetermined frequency band when the first end is configured to have an open circuit.

An active frequency selector, comprising:

• an input port for receiving signals in a plurality of frequency bands;
• an output port for outputting a first signal in a first predetermined frequency band and a second signal in a second predetermined frequency band, the first and second frequency bands being selected from the plurality of frequency bands;
• a signal path coupling the input port and the output port;
• a first TL having a first end and a second end, the first end being a distal end of the first TL;
• a first active component coupling the second end and the signal path in shunt;
• a second TL having a third end and a fourth end, the third end being a distal end of the second TL;
• and
• a second active component coupling the fourth end and the signal path in shunt, wherein
• the first TL is configured to have a phase response that provides an open circuit at the second end for the first predetermined frequency band and a shorted circuit at the second end for the second frequency band;
• and
• the second TL is configured to have a phase response that provides an open circuit at the fourth end for the second predetermined frequency band and a shorted circuit at the second end for the first frequency band;
• and wherein
• the first active component is controlled to be in an on-state to couple the first TL to the signal path and the second active component is controlled to be in an off-state to decouple the second TL to direct the first signal in the first predetermined frequency band to the output port;
• and
• the second active component is controlled to be in an on-state to couple the second TL to the signal path and the first active component is controlled to be in an off-state to decouple the first TL to direct the second signal in the second predetermined frequency band to the output port.

A method of making a frequency selector, comprising:

• forming an input port to receive signals in a plurality of frequency bands;
• forming an output port to output a signal in a predetermined frequency band selected from the plurality of frequency bands;
• forming a signal path between the input port and the output port;
• forming a TL having a first end and a second end;
• coupling the second end of the TL in shunt to the signal path;
• and
• configuring the TL to have a phase response that provides an open circuit at the second end for the predetermined frequency band and a shorted circuit at the second end for frequency bands other than the predetermined frequency band;
• the configuring the TL comprises:
• forming the TL based on a CRLH structure to have the phase response that provides one of 0°±(k×180°), where k=0, 1, 2, . . . , for the predetermined frequency band and one of 90°±(k×180°), where k=0, 1, 2, . . . , for the frequency bands other than the predetermined frequency band when the first end is configured to have an open circuit.