LaAlO3衬底高温超导线性相位滤波器

报道了带宽为10 MHz,80%以上带宽内群时延失真小于20 ns的高温超导线性相位滤波器.该滤波器制作于LaAlO₃衬底上，采用了一种新的谐振器结构以消除寄生耦合的影响，使得滤波器不仅具有很好的线性相位特性，而且具有对称的幅频响应特性.滤波器实测带宽为9.85 MHz，回波损耗约16 dB，带外抑制大于80 dB，群时延失真（80%以上带宽内）约20 ns，其他实测指标也与仿真结果符合很好. 关键词： 高温超导 滤波器 自均衡 线性相位

High temperature superconducting filter with linear phase on LaAlO3 substrates

A linear phase high temperature superconducting （HTS） filter fabricated on LaAlO₃ substrates is presented. The designed passband of the HTS filter is 10 MHz and the group delay ripples over 80% of the passband is less than 20 ns. The filter consists of novel resonators, which are able to minimize the spurious couplings between resonators. As a result, the filter shows not only the linear phase characteristic but also the symmetrical frequency response. The measured passband is 9.85 MHz. The return loss is better than 16 dB and the out-of -band rejection is better than 80 dB. The measured group delay ripples is about 20 ns, which is in good agreement with the simulated result.