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US 11,108,379 B2Granted
High isolation surface acoustic wave duplexer
AssigneeResonant Inc.
InventorJohn Mazotta
Life of this patent
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Abstract
A duplexer includes a surface acoustic wave (SAW) device comprising a transmit filter and a receive filter formed on a piezoelectric substrate. The transmit filter includes a first transmit shunt resonator connected to a first transmit-filter ground terminal. The receive filter includes a first receive shunt resonator connected to a first receive-filter ground terminal. A ground coupling capacitor is connected between the first transmit-filter ground terminal and the first receive-filter ground terminal.
Claims11
A duplexer, comprising:
- a surface acoustic wave (SAW) device comprising:
- a piezoelectric substrate;
- a transmit filter comprising a first plurality of SAW resonators formed on a surface of the piezoelectric substrate, the first plurality of SAW resonators including a first transmit shunt resonator connected to a first transmit-filter ground terminal;
- a receive filter comprising a second plurality of SAW resonators formed on the surface of the piezoelectric substrate, the second plurality of SAW resonators including a first receive shunt resonator connected to a first receive-filter ground terminal;
- and
- a ground coupling capacitor formed on the surface of the piezoelectric substrate and directly connected between the first transmit-filter ground terminal and the first receive-filter ground terminal.
3 more elements
Dependencies are inferred from the claim text.