新型高性能光控高温超导微波可变衰减器研制
Development of laser-controlled high temperature superconducting microwave variable attenuator with low loss and attenuation step
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摘要: 提出了一种用于高温超导系统的新型星载光控高温超导微波可变衰减器，详细介绍了设计过程，并针对测试结果进行了分析。该衰减器的实质是利用液氮温区高温超导薄膜极低的微波表面电阻和卓越的激光响应特性，实现优良的衰减功能。在器件结构的设计上引入过渡材料和透明有机材料以保证器件良好的接地性能以及激光光束的对准。主要结论如下：光控高温超导微波可变衰减器在液氮温区工作，电路尺寸为12 mm×8 mm×0.5 mm，可单独使用也可集成于高温超导系统中，可大幅减小系统的体积与质量；高温超导衰减器的插损小于0.2 dB，比常规衰减器低1个量级；高温超导衰减器的可变衰减步进值小于0.01 dB，比常规衰减器低1～2个量级。根据激光功率大小对衰减器插损变化特性的影响，该衰减器也可以实现步进式调谐。Abstract: This paper proposes new a laser-controlled superconducting microwave variable attenuator which can be used in high- temperature superconducting (HTS) subsystem of satellites. The design process and experimental results are analyzed. Low microwave surface resistance and excellent laser response characteristics of HTS film are contributed to the favorable properties of this attenuator. A transition metal and a transparent material are adopted in the structure of HTS attenuator to ensure the grounded capability and the laser position on substrate. The results show that this attenuator, which is 12 mm×8 mm×0.5 mm and works at low temperature, can be used alone or integrated into HTS system to decrease system volume and weight. Insertion loss of this attenuator is about 0.2 dB, whose magnitud
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