Power handling capability improvement of HTS filter with sliced microstrip line resonators

High-Tc Superconducting Microwave and Millimeter Devices and Circuits—An Overview

“…Power handling capacity of an HTS filter is determined by the critical current of the resonators, which is limited by the current concentration at the edge of the microstrip line [71]. Therefore, various designs have been proposed with modified resonator layout to increase the critical current limit, such as disk resonators [72]- [74] and sliced microstrip lines [17], [75], [76]. Specifically, a 10-pole S-band HTS filter based on special straight-line half-wavelength resonators was reported in [77], showing an out-of-band rejection better than 80 dB and an in-band (2.11-2.19 GHz) power handling capability of 35.8 dBm (3.8W) at 60 K, as shown in Fig.…”

“…Low-loss, high-Q and flat-group-delay filters were developed for microwave and mm-wave receivers in wireless communication and radar applications [14]- [16]. Modern and future wireless systems have raised more stringent requirements to the filter performance in power handling and frequency agility, and novel HTS filters have also been developed to meet the challenges [17], [18].…”

Power-Handling Capability of Superconducting Filters Using Disk- and Ring-Type Bulk Resonators

“…Many researchers have increased the power-handling capability of superconducting band-pass filters (BPFs) by improving the filter structure. Such improvements have been reported for sliced microstrip Manuscript line resonators [3], [4], for microstrip-disk resonators [5]- [8], and for HTS thick film resonators [9]- [11]. Bulk superconducting GdBa 2 Cu 3 O y (GdBCO) fabricated by using a modified quench and melt growth (QMG) method [12] have a surface resistance (R s ), that is low enough to be used in microwave filters [13].…”

100-W-class superconducting transmit bandpass filter using thick disk resonator made with Gd–Ba–Cu–O single-crystal bulk

“…However, the PHC of HTS BPFs is limited by the critical current I c of the HTS material and the current concentration at the edges of conventional microstrip line resonators. 1,2) Therefore, not only the superconducting properties, critical current density J c , and surface resistance R s , but also the resonator structure must be improved to increase the PHC of transmit BPFs. Many research and development efforts aiming to increase the PHC of superconducting BPFs by using structural improvements have already been reported.…”

“…Many research and development efforts aiming to increase the PHC of superconducting BPFs by using structural improvements have already been reported. [2][3][4][5][6][7][8][9][10][11][12] We have recently proposed HTS bulk resonators and their use in BPFs 9) because the R s of the optimized ReBa 2 Cu 3 O y (Re: Dy and Gd) superconducting bulks made using a modified quench and melt growth (QMG) method 13) is sufficiently low for microwave filter applications. 14) Moreover, we found that the PHC of a three-pole BPF using GdBa 2 Cu 3 O y (GdBCO) bulk resonators was higher than that using DyBa 2 Cu 3 O y (DyBCO) bulk resonators in preliminary experiments.…”