Miniature acoustic resonator-based filters and duplexers with cancellation methodology

A radio frequency duplexer with a transmit frequency band or bands and a receive frequency band or bands comprising:

• two hybrid couplers;
• two essentially identical acoustic filters;
• and
• a third acoustic filter;
• wherein
• the two essentially identical acoustic filters have a passband that includes the transmit frequency bands and a stopband that includes the receive frequency bands;
• the third acoustic filter has a passband that includes all of the receive frequency bands and a stopband that includes all of the transmit frequency bands;
• each of the two essentially identical acoustic filters is coupled to both of the two hybrid couplers;
• the third acoustic filter is coupled to one of the two hybrid couplers;
• the hybrid couplers are integrated passive devices;
• and
• the two essentially identical acoustic filters and the third acoustic filter and hybrid couplers are co-packaged in a stacked configuration wherein at least one of the two essentially identical acoustic filters or the third acoustic filter is reconfigurable to reconfigure filter order or the type of filter.

A radio frequency duplexer with one or more transmit frequency bands and one or more receive frequency bands comprising:

• two hybrid couplers;
• two essentially identical acoustic filters;
• and
• a third acoustic filter;
• wherein
• the two essentially identical acoustic filters have a passband that includes all of the receive frequency bands and a stopband that includes all of the transmit frequency bands;
• the third acoustic filter has a passband that includes all of the transmit frequency bands and a stopband that includes all of the receive frequency bands;
• each of the two essentially identical acoustic filters is coupled to both of the two hybrid couplers;
• the third acoustic filter is coupled to one of the two hybrid couplers;
• the hybrid couplers are integrated passive devices;
• and
• the two essentially identical acoustic filters and the third acoustic filter and hybrid couplers are co-packaged in a stacked configuration wherein at least one of the two essentially identical acoustic filters or the third acoustic filter is reconfigurable to reconfigure filter order or the type of filter.