With the development of new mobile communication systems, the composite substrate used for the wideband antennas will show a suitable dielectric constant, low dielectric loss, and good dielectric stability in a wide frequency range. In this work, a kind of dielectric filler, Sr²⁺-doped CaCu₃Ti₄O₁₂ nanowires (Ca_1−xSr_xCu₃Ti₄O₁₂ NWs, xSCCTO NWs), was synthesized via a two-step hydrothermal method for the first time. The composites were then prepared by adding the obtained filler to polydimethylsiloxane (PDMS). Results revealed that Sr²⁺ doping can significantly reduce the dielectric loss of composites and stabilize both the dielectric constant and the dielectric loss in a wide frequency range compared with those of CCTO NWs–PDMS composites. Moreover, 0.4SCCTO NWs–PDMS composites exhibit high thermal stability, tensile strength, breakdown strength, and energy density. These properties effectively broaden the frequency range of the PDMS based composites, which are very suitable for the application in flexible wideband antenna substrate materials.

随着新的移动通信系统的发展，用于宽带天线的复合衬底将在宽频率范围内显示合适的介电常数，低介电损耗和良好的介电稳定性。在这项工作中，通过两步水热法合成了一种介电填料，即掺杂Sr ^2+的CaCu ₃ Ti ₄ O ₁₂纳米线（Ca _{1- x} Sr _x Cu ₃ Ti ₄ O ₁₂ NWs ，x SCCTO NWs）。第一次的方法。然后通过将获得的填料添加到聚二甲基硅氧烷（PDMS）中来制备复合材料。结果显示Sr ²⁺与CCTO NWs-PDMS复合材料相比，掺杂可以显着降低复合材料的介电损耗，并在很宽的频率范围内稳定介电常数和介电损耗。而且，0.4SCCTO NWs-PDMS复合材料具有很高的热稳定性，拉伸强度，击穿强度和能量密度。这些性能有效地拓宽了基于PDMS的复合材料的频率范围，非常适合用于柔性宽带天线基板材料。