{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T19:38:46Z","timestamp":1774381126804,"version":"3.50.1"},"reference-count":22,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2025,4,7]],"date-time":"2025-04-07T00:00:00Z","timestamp":1743984000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Circuit Theory &amp; Apps"],"published-print":{"date-parts":[[2025,11]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>The parity\u2013time (PT) symmetry principle has been widely used in the field of wireless power transfer (WPT) system, but the transmission frequency has not been a new breakthrough. In this paper, a design method of 6.78\u2009MHz WPT system based on PT symmetry is proposed. The Class\u2010E power amplifier (PA) and Class\u2010E rectifier are adopted. The resonant tank adopts the scheme of double\u2010transmitting coils, which improves the transmission efficiency. Because the frequency is greatly improved, the critical coupling coefficient is also significantly reduced. We manufactured a 40\u2010W experimental prototype. Through experiments, we found that the transmission efficiency of the proposed design scheme reached 94.7%. In the exact PT\u2010symmetric region, the output voltage remains constant, which means that the system can transmit power stably and efficiently.<\/jats:p>","DOI":"10.1002\/cta.4538","type":"journal-article","created":{"date-parts":[[2025,4,8]],"date-time":"2025-04-08T01:54:00Z","timestamp":1744077240000},"page":"6162-6174","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["6.78\u2010MHz Double\u2010Transmitting Coils Class\u2010E\n                    <sup>2<\/sup>\n                    Wireless Power Transfer System Based on Parity\u2013Time Symmetry"],"prefix":"10.1002","volume":"53","author":[{"given":"Zhijun","family":"Ye","sequence":"first","affiliation":[{"name":"Department of College of Information Science and Engineering Huaqiao University  Xiamen China"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-4795-0227","authenticated-orcid":false,"given":"Hao","family":"Jia","sequence":"additional","affiliation":[{"name":"Department of College of Information Science and Engineering Huaqiao University  Xiamen China"}]},{"given":"Wei","family":"Cai","sequence":"additional","affiliation":[{"name":"Department of College of Information Science and Engineering Huaqiao University  Xiamen China"}]},{"given":"Youwei","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of College of Information Science and Engineering Huaqiao University  Xiamen China"}]},{"given":"Chun","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of College of Information Science and Engineering Huaqiao University  Xiamen China"}]}],"member":"311","published-online":{"date-parts":[[2025,4,7]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.80.5243"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/nmat3495"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1051\/epn\/2016201"},{"issue":"17","key":"e_1_2_8_5_1","doi-asserted-by":"crossref","DOI":"10.1103\/PhysRevLett.110.173901","article-title":"P T Metamaterials via Complex\u2010Coordinate Transformation Optics","volume":"110","author":"Castaldi G.","year":"2013","journal-title":"Physical Review Letters"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1143254"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature22404"},{"issue":"8","key":"e_1_2_8_8_1","first-page":"2954","article-title":"Distance Extension of S\u2010PS Wireless Power Transfer System Based on Parity\u2010Time Symmetry","volume":"70","author":"Qu Y.","year":"2023","journal-title":"IEEE Transactions on Circuits and Systems II: Express Briefs"},{"issue":"2","key":"e_1_2_8_9_1","doi-asserted-by":"crossref","first-page":"50","DOI":"10.23919\/CJEE.2018.8409350","article-title":"Dual\u2010Coupled Robust Wireless Power Transfer Based on Parity\u2010Time\u2010Symmetric Model","volume":"4","author":"Liu G.","year":"2018","journal-title":"Chinese Journal of Electrical Engineering"},{"key":"e_1_2_8_10_1","doi-asserted-by":"crossref","unstructured":"J.Zhou B.Zhang G.Liu et\u00a0al. \u201cResonance and Distance Insensitive Wireless Power. Transfer with Parity\u2010Time Symmetric Duffing Resonators \u201d inProceedings of the 2018 IEEE Wireless Power Transfer Conference (WPTC) F [C](IEEE 2018).","DOI":"10.1109\/WPT.2018.8639115"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1109\/ACCESS.2020.2966225"},{"key":"e_1_2_8_12_1","doi-asserted-by":"crossref","unstructured":"Z.Wang D.Qiu B.Zhang W.Xiao Y.ChenandF.Xie \u201cExtended\u2010Range Wireless Power Transfer System Based on High\u2010Order PT Symmetric Principle \u201d in2021 IEEE 1st International Power Electronics and Application Symposium (PEAS) Shanghai China(2021) 1\u20136.","DOI":"10.1109\/PEAS53589.2021.9628527"},{"issue":"11","key":"e_1_2_8_13_1","doi-asserted-by":"crossref","first-page":"13396","DOI":"10.1109\/TPEL.2023.3303613","article-title":"A Double\u2010Transmitting Coils Wireless Power Transfer System Based on Parity Time Symmetry Principle","volume":"38","author":"Chen H.","year":"2023","journal-title":"IEEE Transactions on Power Electronics"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1109\/JESTPE.2020.2983231"},{"issue":"24","key":"e_1_2_8_15_1","first-page":"57","article-title":"Optimization of Tapered Coil Wireless Power Transfer System Based on Optimal Transmitter Radius","volume":"51","author":"Hong W. A. N. G.","year":"2021","journal-title":"Electric Drive"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1109\/TPEL.2024.3352918"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1109\/TPEL.2015.2472565"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1109\/TPEL.2022.3230852"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1109\/TPEL.2019.2954078"},{"issue":"6","key":"e_1_2_8_20_1","doi-asserted-by":"crossref","first-page":"6339","DOI":"10.1109\/TPEL.2020.3038562","article-title":"A Clamped and Harmonic Injected Class\u2010E Converter With ZVS and Reduced Voltage Stress Over Wide Range of Distance in WPT System","volume":"36","author":"He L.","year":"2021","journal-title":"IEEE Transactions on Power Electronics"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1109\/TIE.2020.3040666"},{"key":"e_1_2_8_22_1","volume-title":"RF Power Amplifiers","author":"Kazimierczuk M. 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