# US 12,224,737 B2 · Multimode longitudinally coupled surface acoustic wave resonator with modulated pitch > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,737 B2 - Document ID: US12224737B2 - Status: Granted - Kind: B2 - Application number: 17/743,000 - Filed: 2022-05-12 - Published: 2023-01-12 - Granted: 2025-02-11 - Earliest claimed: 2021-07-06 - Assignees: Skyworks Solutions, Inc. - Applicants: Skyworks Solutions, Inc. - Inventors: Tomoya Komatsu; Yiliu Wang - Web page: https://patentgrep.com/patent/US12224737B2 ## CPC - H03H 9/6483: {Ladder SAW filters} - H03H 9/02637: {Details concerning reflective or coupling arrays} - H03H 9/02685: {Grating lines having particular arrangements} - H03H 9/02834: {of temperature influence (cut angles H03H9/02543)} - H03H 9/02842: {of reflections (H03H9/6406 takes precedence)} - H03H 9/145: for networks using surface acoustic waves - H03H 9/14582: {the last fingers having a different pitch} - H03H 9/25: Constructional features of resonators using surface acoustic waves {(devices for manipulating acoustic surface waves in general G10K11/36)} - H03H 9/6436: {having one acoustic track only} - H04B 1/12: Neutralising, balancing, or compensation arrangements - H04B 1/40: Circuits - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - H04B: TRANSMISSION ## Abstract A surface acoustic wave resonator that has at least a first resonant frequency and a second resonant frequency is disclosed. The surface acoustic wave resonator can include an interdigital transducer electrode that is positioned over a piezoelectric layer. The interdigital transducer electrode includes fingers having a first pitch. The surface acoustic wave resonator can also include a first set of reflectors that is positioned over the piezoelectric layer. The first set of reflectors includes a first number of reflectors having a second pitch. The first pitch is greater than the second pitch. The surface acoustic wave resonator can also include a second set of reflectors that is positioned over the piezoelectric layer. The second set of reflectors includes a second number of reflectors having a third pitch. The second number of reflectors is different from the first number of reflectors. ## Claims ### Claim 1 A surface acoustic wave resonator having at least a first resonant frequency and a second resonant frequency, the surface acoustic wave resonator comprising: an interdigital transducer electrode over a piezoelectric layer, the interdigital transducer electrode including fingers having a first pitch; a first set of reflectors over the piezoelectric layer, the first set of reflectors including a first number of reflectors having a second pitch, the first pitch being greater than the second pitch; and a second set of reflectors over the piezoelectric layer, the second set of reflectors including a second number of reflectors having a third pitch, the second number of reflectors being different from the first number of reflectors, the second set of reflectors positioned such that the interdigital transducer electrode is positioned between the first set of reflectors and the second set of reflectors. ### Claim 2 (depends on 1) The surface acoustic wave resonator of claim 1 wherein the second pitch and the third pitch are the same. ### Claim 3 (depends on 1) The surface acoustic wave resonator of claim 1 wherein the second pitch and the third pitch are different. ### Claim 4 (depends on 3) The surface acoustic wave resonator of claim 3 wherein the first pitch is greater than the third pitch. ### Claim 5 (depends on 1) The surface acoustic wave resonator of claim 1 wherein the first pitch is 1% to 20% greater than the second pitch. ### Claim 6 (depends on 5) The surface acoustic wave resonator of claim 5 wherein the first pitch is 10% to 20% greater than the second pitch. ### Claim 7 (depends on 1) An acoustic wave filter configured to filter a radio frequency signal, the acoustic wave filter comprising the surface acoustic wave resonator of claim 1 as a shunt acoustic wave resonator. ### Claim 8 (depends on 1) The surface acoustic wave resonator of claim 1 wherein the number of reflectors configured so as to compensate for degradation of a quality factor of the SAW resonator due to having the first pitch greater than the second pitch. ### Claim 9 (depends on 1) The surface acoustic wave resonator of claim 1 further comprising a second interdigital transducer electrode over the piezoelectric layer and positioned between the interdigital transducer electrode and the first set of reflectors. ### Claim 10 (depends on 9) The surface acoustic wave resonator of claim 9 further comprising a third interdigital transducer electrode over the piezoelectric layer and positioned between the interdigital transducer electrode and the second set of reflectors. ### Claim 11 (depends on 1) A packaged module including a substrate supporting at least one filter, the at least one filter including one or more surface acoustic wave resonators of claim 1. ### Claim 12 (depends on 11) The packaged module of claim 11 wherein the packaged module is a radio frequency front end module. ### Claim 13 (depends on 11) The packaged module of claim 11 wherein the packaged module is a diversity receive module. ### Claim 14 (depends on 11) A wireless communication device including an antenna, a transceiver, and one or more of the packaged modules of claim 11. ### Claim 15 An acoustic wave filter, the acoustic wave filter comprising: shunt acoustic wave resonators including a first shunt acoustic wave resonator, the first shunt acoustic wave resonator including an interdigital transducer electrode having fingers with a first pitch, a first set of reflectors having a first number of reflectors with a second pitch, and a second set of reflectors having a second number of reflectors with a third pitch, the first pitch being greater than the second pitch, the first number being different from the second number, and the first shunt acoustic resonator having at least a first resonant frequency and a second resonant frequency; and series acoustic wave resonators, the series acoustic wave resonators and the shunt acoustic wave resonators together arranged to filter a radio frequency signal. ### Claim 16 (depends on 15) The acoustic wave filter of claim 15 wherein the second pitch and the third pitch are the same. ### Claim 17 (depends on 15) The acoustic wave filter of claim 15 wherein the second pitch and the third pitch are different. ### Claim 18 (depends on 17) The acoustic wave filter of claim 17 wherein the first pitch is greater than the third pitch. ### Claim 19 (depends on 15) The acoustic wave filter of claim 15 wherein the first pitch is 1% to 20% greater than the second pitch. ### Claim 20 (depends on 19) The acoustic wave filter of claim 19 wherein the first pitch is 10% to 20% greater than the second pitch.