This paper presents a 14-pole dual-band high selective high temperature superconducting (HTS) filter including two narrow notches. A flexible half-wavelength resonator, two cross-coupling structures and a novel feeding structure are proposed and analyzed successively. The HTS filter is fabricated on a 2-inch-diameter double-side DyBa₂Cu₃O₇ HTS thin film with a 0.5-mm-thick MgO substrate and measured with a low-temperature test system at 65 K. The measured results show that the filter has 1 dB passbands of 1363–1440 MHz and 1490–1566 MHz, respectively. The filter has two narrow notches with maximum notch depths of more than 30 dB. Due to the cross-coupling structures, five transmission zeroes are located at both sides of the two passbands, which further improve the selectivity of the filter. The measured results are in good agreement with the simulated ones.

本文介绍了一种包括两个窄陷波的 14 极双频带高选择性高温超导 (HTS) 滤波器。先后提出并分析了一种柔性半波长谐振器、两种交叉耦合结构和一种新型馈电结构。HTS 滤波器制作在 2 英寸直径的双面 DyBa ₂ Cu ₃ O _{7 上}具有 0.5 毫米厚 MgO 衬底的 HTS 薄膜，并在 65 K 下使用低温测试系统进行测量。测量结果表明，该滤波器的 1 dB 通带分别为 1363-1440 MHz 和 1490-1566 MHz。滤波器有两个窄陷波，最大陷波深度超过 30 dB。由于交叉耦合结构，两个通带两侧有五个传输零点，进一步提高了滤波器的选择性。实测结果与模拟结果吻合较好。