本文通过改进1/4波长短截线滤波器的结构,大幅减小了滤波器的尺寸.采用改进后的结构设计并制作了通带为250~480MHz的14节高温超导滤波器.在未经调谐的情况下,带内插损小于0.3dB,反射损耗大于10.9dB,带外抑制超过100dB,矩形系数达到1.3.为了实现更高的带内性能,本文提出了针对短截线型滤波器的调谐方法,调谐后滤波器的带内反射损耗改善了2.6dB,验证了本文提出的调谐方法的有效性. In this paper, the structure of the 1/4 wavelength stub filter is improved, the size of the filter is greatly reduced, and a 14-segment high temperature superconducting filter with a passband of 250-480 MHz is designed and fabricated. In the tuned case, the in-band insertion loss is less than 0.3dB, the reflection loss is greater than 10.9dB, the out-of-band rejection is over 100dB and the rectangle factor is 1.3. In order to achieve higher in-band performance, Tuning method, the in-band reflection loss of the tuned filter is improved by 2.6dB, which verifies the effectiveness of the proposed tuning method.