SBIR PHASE II: High Temperature Superconducting Materials Development for High Power Radio Frequency and Microwave Components

小行星9710717 该小型企业创新研究第二阶段项目的主要目标是开发具有高功率处理能力的高温超导（HTS）薄膜，用于高功率RF（射频）和微波组件。 即使高温超导薄膜元件表现出非常高的Q值，它们的功率处理能力往往是有限的，对可能的应用范围施加限制。 HTS膜的功率处理能力仍然是需要改进的具有挑战性的竞技场。凭借在外延高温超导薄膜领域取得的几项成功进展以及在各种技术上重要的衬底上开发原型器件，提议者探索了具有高功率处理能力的新材料。 该方法结合了改进的超导微波性能在Ag掺杂的YBCO薄膜与低介电常数基板（MgF2）在实现这一目标提供的设计灵活性。 进行了微波测量。 由MgF上的YBCO膜制成的平行板谐振器在77 - 80 K下在高达0.5 mT的表面场强下在载流子的41 dB内没有显示出互调产物，表明这些膜中可能的高功率处理能力。 在第一阶段取得成功的基础上，提议者将改进AG：YBCO的材料性能，以实现第二阶段计划的最佳性能。 通过进一步完善AG：YBCO材料基础，他们将构建具有高功率处理能力（30 - 40 dBm）的原型带通滤波器，工作在77 K，频率范围约为2 GHz和10 GHz。 在新兴的高性能发射/接收系统中，这种设备的体积和重量的大幅度减小以及性能的提高在国防和民用电信中都具有很大的市场潜力。 ***

9710717 Harshavardhan This Small Business Innovation Research Phase II project has the primary objective of developing high temperature superconducting (HTS) films with a high power handling capability for high power RF (radio frequency) and microwave components. Even though HTS thin film components exhibit very high-Q values, their power handling capability is often limited, imposing restrictions on the range of possible applications. Power handling capability of HTS films continues to be a challenging arena requiring improvements. Leveraging on several successful advances made in the area of epitaxial HTS thin films and prototype device development on various technologically important substrates, the proposer explored new materials with possible high power handling capability. The approach combined improved superconducting microwave properties in Ag-doped YBCO films with the design flexibility offered by a low dielectric constant substrate (MgF2) in achieving this goal. Microwave measurements have been carried out. Parallel Plate Resonators made from the YBCO films on MgF show no inter- modulation products within 41 dB of the carrier at surface field strengths of up to 0.5 mT at 77-80 K indicating a possible high power handling capability in these films. Based on the success achieved in Phase I, the proposer will, refine the materials properties of AG:YBCO for optimum performance in the Phase II program. By further refining the AG:YBCO materials base, they will build prototype band pass filters with high power handling capability (30-40 dBm) operating at 77 K in the frequency range around 2 GHz and 10 GHz. The major reduction in volume and weight together with improved performance of such devices in emerging high performance Transmit/Receive systems have a large market potential both in defense and civilian telecommunications. ***