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However, conventional HBARs often suffer from impedance mismatch at metal interfaces, spurious modes, and limited flexibility in resonant mode volume design. Here we demonstrate a laterally excited high\u2010overtone thickness\u2010shear bulk acoustic resonator (X\u2010HTBAR) based on a 3\u00a0\u00b5m 128\u00b0 Y\u2010cut LiNbO\n                    <jats:sub>3<\/jats:sub>\n                    film on a high\u2010resistivity Si substrate, enabling excitation of thickness\u2010shear modes without a bottom electrode. The planar electrode configuration confines elastic energy within the electrode gap region and provides stable free spectral ranges. Experiments show comb\u2010like phonon spectra from 0.1\u20131.8\u00a0GHz with quality factors of 10\n                    <jats:sup>3<\/jats:sup>\n                    \u201310\n                    <jats:sup>5<\/jats:sup>\n                    and frequency\u2013quality products exceeding 10\n                    <jats:sup>1<\/jats:sup>\n                    <jats:sup>3<\/jats:sup>\n                    . Gridded electrodes suppress spurious modes, while the strong electromechanical coupling of 128\u00b0 Y\u2010cut LiNbO\n                    <jats:sub>3<\/jats:sub>\n                    enables tunable resonant mode volumes (0.008\u20130.064 mm\n                    <jats:sup>3<\/jats:sup>\n                    ). These results demonstrate an alternative architecture for multimode acoustic resonators with potential applications in microwave and electro\u2010acoustic systems.\n                  <\/jats:p>","DOI":"10.1002\/advs.75456","type":"journal-article","created":{"date-parts":[[2026,4,27]],"date-time":"2026-04-27T15:18:28Z","timestamp":1777303108000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Impedance\u2010Matched High\u2010Overtone Thickness\u2010Shear Bulk Acoustic Resonators With Scalable Mode Volume"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0479-7988","authenticated-orcid":false,"given":"Zi\u2010Dong","family":"Zhang","sequence":"first","affiliation":[{"name":"State Key Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University  Nanjing China"},{"name":"Institute for Frontier Science Nanjing University of Aeronautics and Astronautics  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhen\u2010Hui","family":"Qin","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi\u2010Han","family":"He","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yun\u2010Fei","family":"Cheng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hao","family":"Yan","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Si\u2010Yuan","family":"Yu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University  Nanjing China"},{"name":"Collaborative Innovation Center of Advanced Microstructures Nanjing University  Nanjing China"},{"name":"Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ming\u2010Hui","family":"Lu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University  Nanjing China"},{"name":"Collaborative Innovation Center of Advanced Microstructures Nanjing University  Nanjing China"},{"name":"Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yan\u2010Feng","family":"Chen","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Solid State Microstructures Department of Materials Science and Engineering Nanjing University  Nanjing China"},{"name":"Collaborative Innovation Center of Advanced Microstructures Nanjing University  Nanjing China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,4,27]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1109\/22.260698"},{"key":"e_1_2_10_3_1","unstructured":"S.Ballandras T.Baron E.Lebrasseur et\u00a0al. \u201cHigh Overtone Bulk Acoustic Resonators: Application to Resonators Filters and Sensors \u201d inProceedings of Meetings on Acoustics(HAL open science 2012)."},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1109\/58.165563"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1109\/TUFFC.2012.2280"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1109\/TUFFC.2020.3025618"},{"key":"e_1_2_10_7_1","unstructured":"V. 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