Miniaturized Superconducting Filter Realized by Using Dual-Mode and Stepped Resonators

高温超导滤波器应用的探索与实践

“…双模片型滤波器的主要设计难点, 除了 选择合适的双模耦合实现方式以外, 主要集中在多 个膜片之间的耦合结构设计和调谐, 特别在相对带 宽变窄以后(小于 1%), 上述问题变得非常突出, 难 于解决. 因此尽管近年来文献中出现一些中心频率 在 2 GHz 附近的大功率高温超导滤波器, 但是其相 对带宽过宽(3%左右), 功率承受能力也不够高(最高 仅能达到 2 W) [21,22] , 无法满足使用要求, 迫切需要在 设计方法上取得突破.…”

High-temperature superconducting reaction-type transmitting filter consisting of novel split open-ring resonators

“…This is because of their low power-handling capability caused by high surface-current concentrations on the devices. Research and development of the HTS transmitting filters are carried out mostly on dual-mode filters employing patch resonators for dispersion of surface-current densities [1], [2]. Although dual-mode filters have benefit of current density dispersion, it is difficult to realize sharp cut-off and miniaturization because of considerably large resonator size.…”

High Sideband Suppression Dual-Mode Filters Using New CPW Resonator

“…The dual-mode property has been particularly investigated and developed for single [2,3] or dualband [4,5] bandpass filters to obtain high frequency selectivity near passbands by using one or more transmission zeros on the low or high side of passbands. In [6], a cross-slotted patch resonator is successfully developed to demonstrate the simultaneous size and loss reduction, and further to build a novel dual-mode bandpass patch filter by suitably selecting the unequal cross-slot lengths along the two orthogonally diagonal planes. A dual-mode dual-band bandpass filter using ridge gap structure is presented in [7], which needs only a single input and output.…”