Passive multi-band duplexer

A passive multi-band duplexer comprising:

• a first plurality of sub-band bandpass filters, such that each of the first plurality of sub-band bandpass filters is coupled between a common port and a first switching circuit;
• the first switching circuit adapted to electrically couple a selected one of the first plurality of sub-band bandpass filters to a first tunable LC bandpass filter;
• the first tunable LC bandpass filter coupled between a first port and the first switching circuit;
• a second plurality of sub-band bandpass filters, such that each of the second plurality of sub-band bandpass filters is coupled between the common port and a second switching circuit;
• the second switching circuit adapted to electrically couple a selected one of the second plurality of sub-band bandpass filters to a second tunable LC bandpass filter;
• the second tunable LC bandpass filter coupled between a second port and the second switching circuit;
• and
• control circuitry adapted to select the one of the first plurality of sub-band bandpass filters, select the one of the second plurality of sub-band bandpass filters, tune the first tunable LC bandpass filter and tune the second tunable LC bandpass filter, such that a fixed passband center frequency of the selected one of the first plurality of sub-band bandpass filters is about equal to a tunable passband center frequency of the first tunable LC bandpass filter and a fixed passband center frequency of the selected one of the second plurality of sub-band bandpass filters is about equal to a tunable passband center frequency of the second tunable LC bandpass filter.