Compensation structures for radio frequency filtering devices

A radio frequency (RF) duplexing device, comprising:

• a transmitter (TX) port;
• a receiver (RX) port;
• an antenna (ANT) port;
• a TX filter connected between the TX port and the ANT port;
• an RX filter connected between the RX port and the ANT port;
• and
• a compensation structure electrically connected to a signal line between the RX port and the TX port, the compensation structure comprising:
• a piezoelectric material;
• and
• a plurality of interdigital transducers (IDTs) on the piezoelectric material that are longitudinally coupled between two reflective structures to form a surface acoustic wave (SAW) device, the plurality of IDTs comprising a first IDT, a last IDT, and at least one additional IDT that is arranged between the first IDT and the last IDT, the at least one additional IDT comprising an electrically floating electrode, and wherein each of the first IDT, the at least one additional IDT, and the last IDT are electrically connected to a different portion of the signal line.

A radio frequency (RF) filtering device, comprising:

• a plurality of series resonators and a plurality of shunt resonators electrically connected along a signal line between a first port and a second port;
• a compensation structure arranged in parallel with one or more series resonators of the plurality of series resonators, the compensation structure comprising:
• a surface acoustic wave (SAW) device comprising:
• a piezoelectric material;
• and
• a plurality of interdigital transducers (IDTs) on the piezoelectric material that are longitudinally coupled between two reflective structures, wherein a first IDT and a last IDT of the plurality of IDTs are electrically connected to different portions of the signal line, and at least one additional IDT of the plurality of IDTs is arranged between the first IDT and the last IDT, the at least one additional IDT comprising an electrically floating electrode;
• and
• a SAW filtering device serially connected between the second port and the plurality of series resonators, wherein the last IDT is electrically connected between the SAW filtering device and the plurality of series resonators.