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Conventional microwave dielectric ceramics exhibit low coefficients of thermal expansion (CTE, 5\u201312 ppm\/\u00b0C), causing severe thermal mismatch with commercial SAC305 lead-free solder (21.9 ppm\/\u00b0C) and copper conductors, which generates enormous thermal stress and induces solder joint cracking during temperature cycling. Herein, we report an intrinsically high-CTE microwave dielectric ceramic Na3P3O9 with a CTE of 22.25 ppm\/\u00b0C, matching almost perfectly with SAC305 solder. At its optimal sintering temperature of 610 \u00b0C, this material simultaneously possesses an ultralow permittivity (\u03b5r = 4.88) and ultralow dielectric loss (on the order of 10\u20134). The physical origins of its excellent comprehensive properties are elucidated via crystal structure analysis and chemical bond theory. Finite element simulations reveal that under the standard electronic packaging thermal cycling condition of \u201340 to 125 \u00b0C, the thermal stress of solder joints on Na3P3O9 is only 54% of that on commercial A6M and 30% of that on conventional alumina. A Ku-band broadband dielectric resonator antenna designed using this material achieves an impedance bandwidth of 3.1 GHz and an in-band total efficiency of &amp;gt;87.2%, fully covering the transmit and receive bands of fixed-satellite and broadcasting satellite services and enabling transmit-receive integration for low Earth orbit satellite terminals. This work provides a high-CTE dielectric material system for addressing the solder joint reliability issue in high-frequency passive components.<\/jats:p>","DOI":"10.1021\/acsami.6c14128","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T19:02:29Z","timestamp":1790190149000},"page":"53656-53665","source":"Crossref","is-referenced-by-count":0,"title":["High-CTE Na3P3O9 Ceramic with Excellent Dielectric Properties Significantly Mitigates Thermal Stress of Solder Joints in RF Systems"],"prefix":"10.1021","volume":"18","author":[{"given":"Jian","family":"Bao","sequence":"first","affiliation":[{"name":"Xi'an Jiaotong University , , , ,","place":["Xi'an, Shaanxi, China, 710049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jing","family":"Guo","sequence":"additional","affiliation":[{"name":"Xi'an Jiaotong University , , , ,","place":["Xi'an, Shaanxi, China, 710049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhen","family":"Fang","sequence":"additional","affiliation":[{"name":"Xi'an Jiaotong University , , , ,","place":["Xi'an, Shaanxi, China, 710049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhen-Tao","family":"Wang","sequence":"additional","affiliation":[{"name":"Xi'an Jiaotong University , , , ,","place":["Xi'an, Shaanxi, China, 710049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Wang","sequence":"additional","affiliation":[{"name":"Xi'an Jiaotong University , , , ,","place":["Xi'an, Shaanxi, China, 710049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7533-3251","authenticated-orcid":true,"given":"Andreu","family":"Cabot","sequence":"additional","affiliation":[{"name":"Catalonia Institute for Energy Research (IREC) , , ,","place":["Sant Adri\u00e0 de Bes\u00f2s, Barcelona, Catalonia, Spain, 08930"]},{"name":"ICREA Pg. Lluis Companys , , ,","place":["Barcelona, Catalonia, Spain, 08010"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Da","family":"Tian","sequence":"additional","affiliation":[{"name":"Nanjing University , , , ,","place":["Nanjing, Jiangsu, China, 210023"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2468-7612","authenticated-orcid":true,"given":"Cai-Hong","family":"Zhang","sequence":"additional","affiliation":[{"name":"Nanjing University , , , ,","place":["Nanjing, Jiangsu, China, 210023"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Biao-Bing","family":"Jin","sequence":"additional","affiliation":[{"name":"Nanjing University , , , ,","place":["Nanjing, Jiangsu, China, 210023"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Li-Xia","family":"Pang","sequence":"additional","affiliation":[{"name":"Xi'an Technological University , , , ,","place":["Xi'an, Shaanxi, China, 710032"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2986-6046","authenticated-orcid":true,"given":"Kar Ban","family":"Tan","sequence":"additional","affiliation":[{"name":"Universiti Putra Malaysia , , , ,","place":["Serdang, Selangor, Malaysia, 43400"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-5858-2974","authenticated-orcid":true,"given":"Qin","family":"Guo","sequence":"additional","affiliation":[{"name":"Xinjiang Institute of Technology , , , ,","place":["Aksu, Xinjiang Uygur Autonomous Region, China, 843100"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7411-4658","authenticated-orcid":true,"given":"Di","family":"Zhou","sequence":"additional","affiliation":[{"name":"Xi'an Jiaotong University , , , ,","place":["Xi'an, Shaanxi, China, 710049"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,23]]},"reference":[{"issue":"18","key":"2026100705070203700_cit1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.202522167","article-title":"Novel Temperature-Stable (1-x)Ba3V2P3O15-xBaV2O6 Composite Ceramics with Ultralow Sintering Temperature and Low Dielectric Loss for Dielectric Resonator Antenna Applications","volume":"36","author":"Wang","year":"2026","journal-title":"Adv. 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