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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">radioelectronics</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений России. Радиоэлектроника</journal-title><trans-title-group xml:lang="en"><trans-title>Journal of the Russian Universities. Radioelectronics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1993-8985</issn><issn pub-type="epub">2658-4794</issn><publisher><publisher-name>Saint Petersburg Electrotechnical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32603/1993-8985-2022-25-5-67-79</article-id><article-id custom-type="elpub" pub-id-type="custom">radioelectronics-679</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МИКРО- И НАНОЭЛЕКТРОНИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MICRO- AND NANOELECTRONICS</subject></subj-group></article-categories><title-group><article-title>Быстрый численный расчет параметров поверхностных акустических волн Рэлея для модели связанных мод</article-title><trans-title-group xml:lang="en"><trans-title>Rapid Numerical Calculation of Rayleigh Surface Acoustic Wave Parameters for a Model of Coupling Modes</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6602-0528</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Койгеров</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Koigerov</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Койгеров Алексей Сергеевич – кандидат технических наук (2011), доцент (2021) кафедры микро- и наноэлектроники (МНЭ)</p><p>ул. Профессора Попова, д. 5 Ф, Санкт-Петербург, 197022</p></bio><bio xml:lang="en"><p>Aleksey S. Koigerov, Cand. Sci. (Eng.) (2011), Associate Professor (2021) of the Department of Micro- and Nano Electronics</p><p>5 F, Professor Popov St., St Petersburg 197022</p></bio><email xlink:type="simple">a.koigerov@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2071-074X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Балышева</surname><given-names>О. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Balysheva</surname><given-names>O. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Балышева Ольга Леонидовна – кандидат технических наук (1998), доцент (2006) кафедры конструирования и технологий электронных и лазерных средств</p><p>ул. Б. Морская, д. 67, Санкт-Петербург, 190000</p></bio><bio xml:lang="en"><p>Olga L. Balysheva, Cand. Sci. (Eng.) (1998), Associate Professor (2006) of the Department of Design and Technology of Electronic and Laser Equipment</p><p>67, Bolshaya Morskaya St., St Petersburg 190000</p></bio><email xlink:type="simple">balysheva@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный электротехнический университет "ЛЭТИ" им. В. И. Ульянова (Ленина)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Saint Petersburg Electrotechnical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный университет аэрокосмического приборостроения</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Saint Petersburg State University of Aerospace Instrumentation</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>28</day><month>11</month><year>2022</year></pub-date><volume>25</volume><issue>5</issue><fpage>67</fpage><lpage>79</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Койгеров А.С., Балышева О.Л., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Койгеров А.С., Балышева О.Л.</copyright-holder><copyright-holder xml:lang="en">Koigerov A.S., Balysheva O.L.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://re.eltech.ru/jour/article/view/679">https://re.eltech.ru/jour/article/view/679</self-uri><abstract><sec><title>Введение</title><p>Введение. Важнейшим этапом разработки устройств на поверхностных акустических волнах (ПАВ) является математическое моделирование. Успешно применяемые в последние годы компьютерные пакеты моделирования позволяют существенно сократить время и повысить точность расчета характеристик при проектировании. Для быстрого анализа рабочих характеристик проектируемых акустоэлектронных приборов необходимо знание основных параметров акустических волн, распространяющихся в материалах подложек устройств.  </p></sec><sec><title>Цель работы</title><p>Цель работы. Предложение и апробация, на примере анализа волн Рэлея методом конечных элементов, методики расчета ключевых параметров, необходимых для моделирования ПАВ-устройств на основе модели P-матриц и модели связанных мод.  </p></sec><sec><title>Материалы и методы</title><p>Материалы и методы. Теоретическая часть работы выполнялась с применением математической теории дифференциальных уравнений, использовалось матричное описание и метод конечных элементов. В ходе работы применялась математическая обработка в программах MatLab и COMSOL.</p></sec><sec><title>Результаты</title><p>Результаты. Разработана оригинальная методика извлечения параметров ПАВ для модели связанных мод на основе быстрого алгоритма, реализованного в пакете COMSOL. Сравнение результатов расчета таких параметров, как коэффициент электромеханической связи, скорость распространения акустической волны по поверхности подложки, с известными данными из литературных источников показало хорошее совпадение. На основе извлеченных параметров спроектирован ряд трансверсальных фильтров. Выполнено сопоставление результатов расчета и экспериментальных измерений коэффициента передачи.</p></sec><sec><title>Заключение</title><p>Заключение. Предложенная методика анализа бесконечных периодических электродов методом конечных элементов на основе анализа собственных частот и статического анализа позволила рассчитать основные параметры волн Рэлея в традиционных подложках ниобата лития, танталата лития и кварца. Практическая значимость состоит в использовании полученных параметров при разработке различных классов акустоэлектронных устройств.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Introduction</title><p>Introduction. Mathematical modeling is the most important stage in the development of devices based on surface acoustic waves (SAW). Computer simulations that have proven their efficiency in recent years can significantly reduce the time input and improve the accuracy of calculating the designed characteristics. A rapid analysis of the operating characteristics of the designed acoustoelectronic devices requires the knowledge of basic parameters of acoustic waves propagating along the device substrates.  </p></sec><sec><title>Aim</title><p>Aim. Proposal and approbation of a methodology for calculating the key parameters necessary for modeling SAW devices based on the models of P-matrix and coupling modes, based on the example of analysis of Rayleigh waves by the finite element method.  </p></sec><sec><title>Materials and methods</title><p>Materials and methods. The theoretical part of the work was carried out using the mathematical theory of differential equations presented in a matrix form and the finite element method. Mathematical processing was conducted in the MatLab and COMSOL environments.  </p></sec><sec><title>Results</title><p>Results. An original technique for deriving SAW parameters for a model of coupling modes based on a rapid algorithm implemented in COMSOL was developed. A comparison of the calculated parameters of electromechanical coupling coefficient and velocity of acoustic waves over the substrate surface with those presented in literature showed their good agreement. Based on the derived parameters, a number of transversal filters were designed. A comparison of the calculated and experimentally measured values of the transmission coefficient was performed.  </p></sec><sec><title>Conclusion</title><p>Conclusion. The proposed technique for analyzing infinite periodic electrodes by the finite element method based on an analysis of eigenfrequencies and static analysis made it possible to calculate the main parameters of Rayleigh waves in conventional substrates: lithium niobate, lithium tantalate and quartz. The practical significance lies in the use of the obtained parameters in the development of various classes of acoustoelectronic devices.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>акустоэлектронные устройства</kwd><kwd>поверхностные акустические волны</kwd><kwd>метод связанных мод</kwd><kwd>метод конечных элементов</kwd><kwd>COMSOL</kwd><kwd>пьезоэлектрические материалы</kwd><kwd>встречно-штыревой преобразователь</kwd><kwd>фильтр на ПАВ</kwd></kwd-group><kwd-group xml:lang="en"><kwd>acoustoelectronic devices</kwd><kwd>surface acoustic waves</kwd><kwd>coupling mode model</kwd><kwd>finite element method</kwd><kwd>COMSOL</kwd><kwd>piezoelectric materials</kwd><kwd>inter-digital transducer</kwd><kwd>SAW filter</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Авторы выражают благодарность генеральному директору – генеральному конструктору ООО "АЭК Дизайн" В. Р. Реуту за предоставленные экспериментальные данные.</funding-statement><funding-statement xml:lang="en">The authors express their gratitude to the general director and the general designer "AEC-Design" V. R. Reut for the experimental data provided.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Фильтрация и спектральный анализ радиосигналов. Алгоритмы. Структуры. Устройства / под ред. Ю. В. Гуляева. М.: Радиотехника, 2020. 504 с.</mixed-citation><mixed-citation xml:lang="en">Aristarkhov G. M., Gulyaev Yu. V., Dmitriev V. F., Zajchenko K. V., Komarov V. V. Fil'tratsiya i spektral'nyi analiz radiosignalov. Algoritmy. Struktury. Ustroistva [Filtrayion and Spectral Analysis of Radio Signals. Algorithms. Structures. Devices]. Ed. by Yu. V. Gulyaev. Moscow, Radiotekhnika, 2020, 504 p. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Балышева О. Л. Подложки для функциональных устройств на ПАВ // Техника радиосвязи. 2017. Вып. 1 (32). С. 92–101.</mixed-citation><mixed-citation xml:lang="en">Balysheva O. L. The Substrates for Functional SAW Devices. Radio Communication Technology. 2017, iss. 1 (32), pp. 92–101. (In Russ.)</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Койгеров А. С. Аналитический подход к расчету резонаторного комбинированного фильтра на поверхностных акустических волнах на основе модели связанных мод // Изв. вузов России. Радиоэлектроника. 2022. Т. 25, № 2. С. 16–28. doi: 10.32603/1993-8985-2022-25-2-16-28</mixed-citation><mixed-citation xml:lang="en">Koigerov A. S. Analytical Approach to Designing a Combined-Mode Resonator Filter on Surface Acoustic Waves Using the Model of Coupling of Modes. Journal of the Russian Universities. Radioelectronics. 2022, vol. 25, no. 2, pp. 16–28. doi: 10.32603/1993-8985-2022-25-2-16-28</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Plessky V. P., Koskela J. Coupling-of-modes analysis of SAW devices // Int. J. High Speed Electr. and Syst. 2000. Vol. 10, № 4. P. 867–947. doi: 10.1142/S0129156400000684</mixed-citation><mixed-citation xml:lang="en">Plessky V. P., Koskela J. Coupling-of-Modes Analysis of SAW Devices. Int. J. High Speed Electr. and Syst. 2000, vol. 10, no. 4, pp. 867–947. doi: 10.1142/S0129156400000684</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Hashimoto K. Surface Acoustic Wave Devices in Telecommunications: modeling and simulation. Heidelberg: Springer Berlin, 2000. 330 p. doi: 10.1007/978-3-662-04223-6</mixed-citation><mixed-citation xml:lang="en">Hashimoto K. Surface Acoustic Wave Devices in Telecommunications: Modeling and Simulation. Heidelberg, Springer Berlin, 2000, 330 p. doi: 10.1007/978-3-662-04223-6</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Sveshnikov B., Koigerov A., Yankin S. Unveiling the polarization of the multimode acoustic fields // Ultrasonics. 2018. Vol. 82. P. 209–216. doi: 10.1016/j.ultras.2017.08.011</mixed-citation><mixed-citation xml:lang="en">Sveshnikov B., Koigerov A., Yankin S. Unveiling the Polarization of the Multimode Acoustic Fields. Ultrasonics. 2018, vol. 82, pp. 209–216. doi: 10.1016/j.ultras.2017.08.011</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">A Novel Method to Extract COM Parameters for SAW Based on FEM / Y. Zhang, J. Jin, H. Li, H. Hu // Symp. on Piezoelectricity, Acoustic Waves and Device Applications (SPAWD). Harbin, China, 11–14 Jan. 2019. Piscataway: IEEE, 2019. P. 1–5. doi: 10.1109/SPAWDA.2019.8681838</mixed-citation><mixed-citation xml:lang="en">Zhang Y., Jin J., Li H., Hu H. A Novel Method to Extract COM Parameters for SAW Based on FEM. Symp. on Piezoelectricity, Acoustic Waves and Device Applications (SPAWD). Harbin, China, 11–14 Jan. 2019. IEEE, 2019, pp. 1–5. doi: 10.1109/SPAWDA.2019.8681838</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Новая конструкция многоканальной ПАВ-радиометки на основе многополоскового ответвителя / В. Р. Реут, А. С. Койгеров, С. С. Андрейчев, С. П. Дорохов, А. С. Салов // Нано- и микросистемная техника. 2019. Т. 21, № 10. С. 579–593. doi: 10.17587/nmst.21.579-593</mixed-citation><mixed-citation xml:lang="en">Reut V. R., Koigerov A. S., Andreychev S. S., Dorokhov S. P., Salov A. S. The New Design of SAW ID Tags on Base of Multistrip Coupler. Nano- and Microsystems Technology. 2019, vol. 21, no. 10, pp. 579– 593. doi: 10.17587/nmst.21.579-593</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Systematical Study of the Basic Properties of Surface Acoustic Wave Devices Based on ZnO and GaN Multilayers / J. Shen, S. Fu, R. Su, H. Xu, F. Zeng, Ch. Song, F. Pan // Electronics. 2021. Vol. 10, № 1. P. 23. doi: 10.3390/electronics10010023</mixed-citation><mixed-citation xml:lang="en">Shen J., Fu S., Su R., Xu H., Zeng F., Song Ch., Pan F. Systematical Study of the Basic Properties of Surface Acoustic Wave Devices Based on ZnO and GaN Multilayers. Electronics. 2021, vol. 10, no. 1, p. 23. doi: 10.3390/electronics10010023</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Periodic Analysis of Surface Acoustic Wave Resonator with Dimensionally Reduced PDE Model Using COMSOL Code / Q. Zhang, Z. Chen, Y. Chen, J. Dong, P. Tang, S. Fu, H. Wu, J. Ma, X. Zhao // Micromachines. 2021. Vol. 12, № 2. P. 1–14. doi: 10.3390/mi12020141</mixed-citation><mixed-citation xml:lang="en">Zhang Q., Chen Z., Chen Y., Dong J., Tang P., Fu S., Wu H., Ma J., Zhao X. Periodic Analysis of Surface Acoustic Wave Resonator with Dimensionally Reduced PDE Model Using COMSOL Code. Micromachines. 2021, vol. 12, no. 2, pp. 1–14. doi: 10.3390/mi12020141</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Full 3D FEM Analysis of Scattering at a Border Between IDT and Reflector in SAW Resonators / A. Iyama, X. Li, J. Bao, N. Matsuoka, T. Omori, K. Hashimoto // IEEE Intern. Ultrasonics Symp. Glasgow, UK, 6– 9 Oct. 2019. Piscataway: IEEE, 2019. P. 1235–1238. doi: 10.1109/ULTSYM.2019.8925826</mixed-citation><mixed-citation xml:lang="en">Iyama A., Li X., Bao J., Matsuoka N., Omori T., Hashimoto K. Full 3D FEM Analysis of Scattering at a Border Between IDT and Reflector in SAW Resonators. IEEE Intern. Ultrasonics Symposium, Glasgow, UK, 6– 9 Oct. 2019. Piscataway, IEEE, 2019, pp. 1235–1238. doi: 10.1109/ULTSYM.2019.8925826</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Automated COM parameter extraction for SiO2/LiNbO3 and SiO2/LiTaO3 substrates / S. Malocha, K. J. Gamble, H. Dong, A. Dharmalingam // IEEE Intern. Ultrasonics Symp. Tours, France, 18–21 Sept. 2016. Piscataway: IEEE, 2016. P. 1–4. doi: 10.1109/ULTSYM.2016.7728387</mixed-citation><mixed-citation xml:lang="en">Malocha S., Gamble K. J., Dong H., Dharmalingam A. Automated COM Parameter Extraction for SiO2/LiNbO3 and SiO2/LiTaO3 Substrates. IEEE Intern. Ultrasonics Symp. Tours, France, 18–21 Sept. 2016. Piscataway, IEEE, 2016, pp. 1–4. doi: 10.1109/ULTSYM.2016.7728387</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Pastureaud T. Evaluation of the P-matrix parameters frequency variation using periodic FEM/BEM analysis // IEEE Ultrasonics Symp. Montreal, Quebec, Canada, 23–27 Aug. 2004. Piscataway: IEEE, 2004. Vol. 1. P. 80–84. doi: 10.1109/ULTSYM.2004.1417673</mixed-citation><mixed-citation xml:lang="en">Pastureaud T. Evaluation of the P-Matrix Parameters Frequency Variation Using Periodic FEM/BEM Analysis. IEEE Ultrasonics Symp. Montreal, Quebec, Canada, 23–27 Aug. 2004. Piscataway, IEEE, 2004, vol. 1, pp. 80–84. doi: 10.1109/ULTSYM.2004.1417673</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Simulation of wireless passive SAW sensors based on FEM/BEM model / Q. Fu, W. Luo, Y. Wang, J. Wang, D. Zhou // IEEE Ultrasonics Symp. Beijing, China, 2–5 Nov. 2008. Piscataway: IEEE, 2008. P. 1861–1864. doi: 10.1109/ULTSYM.2008.0458</mixed-citation><mixed-citation xml:lang="en">Fu Q., Luo W., Wang Y., Wang J., Zhou D. Simulation of Wireless Passive SAW Sensors Based on FEM/BEM Model. IEEE Ultrasonics Symp. Beijing, China, 2–5 Nov. 2008. Piscataway, IEEE, 2008, pp. 1861– 1864. doi: 10.1109/ULTSYM.2008.0458</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Cherednick V. I., Dvoesherstov M. Y. COM Parameters of Langasite Crystal // IEEE Ultrasonics Symp. Proc. New York, USA, 28–31 Oct. 2007. Piscataway: IEEE, 2007. P. 2351–2354. doi: 10.1109/ULTSYM.2007.591</mixed-citation><mixed-citation xml:lang="en">Cherednick V. I., Dvoesherstov M. Y. COM Parameters of Langasite Crystal. IEEE Ultrasonics Symp. Proc. New York, USA, 28–31 Oct. 2007. Piscataway, IEEE, 2007, pp. 2351–2354. doi: 10.1109/ULTSYM.2007.591</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Tikka A., Said Al-Sarawi, Abbott D. Acoustic Wave Parameter Extraction with Application to Delay Line Modelling Using Finite Element Analysis // Sensors &amp; Transducers J. 2008. Vol. 95, iss. 8. P. 26–39.</mixed-citation><mixed-citation xml:lang="en">Tikka A., Said Al-Sarawi, Abbott D. Acoustic Wave Parameter Extraction with Application to Delay Line Modelling Using Finite Element Analysis. Sensors &amp; Transducers J. 2008, vol. 95, iss. 8, pp. 26–39.</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Morgan D. Surface Acoustic Wave Filters With Applications to Electronic Communications and Signal Processing. Cambridge: Academic Press, 2010. 448 p.</mixed-citation><mixed-citation xml:lang="en">Morgan D. Surface Acoustic Wave Filters With Applications to Electronic Communications and Signal Processing. Cambridge, Academic Press, 2010, 448 p.</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Campbell C. K. Surface Acoustic Wave Devices for Mobile and Wireless Communication. Boston: Academic Press, 1998. 631 p.</mixed-citation><mixed-citation xml:lang="en">Campbell C. K. Surface Acoustic Wave Devices for Mobile and Wireless Communication. Boston, Academic Press, 1998, 631 p.</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Inagawa K., Koshiba M. Equivalent networks for SAW interdigital transducers // IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 1994. Vol. 41, № 3. P. 402–411. doi: 10.1109/58.285476</mixed-citation><mixed-citation xml:lang="en">Inagawa K., Koshiba M. Equivalent Networks for SAW Interdigital Transducers. IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 1994, vol. 41, no. 3, pp. 402–411. doi: 10.1109/58.285476</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Qiao D., Liu W., Smith P. M. General Green's functions for SAW device analysis // IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 1999. Vol. 46, № 5. P. 1242–1253. doi: 10.1109/58.796129</mixed-citation><mixed-citation xml:lang="en">Qiao D., Liu W., Smith P. M. General Green's Functions for SAW Device Analysis. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. 1999, vol. 46, no. 5, pp. 1242–1253. doi: 10.1109/58.796129</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Свешников Б. В., Багдасарян А. С. Основные принципы формирования поперечных мод в многослойных волноводах поверхностных акустических волн // Изв. высш. учеб. заведений. Радиофизика. 2016. Т. 59, № 2. С. 108–123. doi: 10.1007/s11141-016-9713-7</mixed-citation><mixed-citation xml:lang="en">Sveshnikov B. V., Bagdasaryan A. S. The Main Principles of Formation of the Transverse Modes in the Multilayered Waveguides of Surface Acoustic Waves. Radiophysics and Quantum Elecronics. 2016, vol. 59, no. 6, pp. 449–460. doi: 10.1007/s11141-016-9713-7</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
