{"paper":{"title":"Q-Enhanced SH-SAW Ladder Filter in Thin-Film Lithium Tantalate Using Bartlett Apodization","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Bartlett apodization in SH-SAW resonators on thin-film LiTaO3 raises Q from 688 to 1522","cross_cats":[],"primary_cat":"eess.SP","authors_text":"Ruochen Lu, Taran Anusorn, Tzu-Hsuan Hsu, Yuchen Ma","submitted_at":"2026-05-15T19:43:41Z","abstract_excerpt":"Shear-horizontal surface acoustic wave (SH-SAW) filters have shown strong potential for low-loss, compact, GHz-frequency RF front ends. In this work, we demonstrate a high-performance SH-SAW filter design at 4.35 GHz utilizing 42{\\deg}Y-cut thin-film lithium tantalate (LiTaO3) on a SiO2/Si platform. Despite the limitations of thin aluminum metallization and its associated ohmic losses, we show that implementing a Bartlett window apodization technique, primarily intended for in-band spurious-mode suppression, yields a significantly improved quality factor (Q) of 1,522 from 688 in conventional i"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"implementing a Bartlett window apodization technique, primarily intended for in-band spurious-mode suppression, yields a significantly improved quality factor (Q) of 1,522 from 688 in conventional interdigitated SH-SAW resonators.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The measured Q improvement is due to the apodization suppressing spurious modes rather than other unaccounted fabrication variations or measurement setup differences between the apodized and conventional 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