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传统的椭圆函数低通滤波器基于半集总参数的高低阻抗线实现椭圆函数LC网络,其尺寸较大,特别是对于低截止频率的低通滤波器,难于在高温超导晶圆片有限尺寸内实现与带通滤波器的集成。提出了一种基于高温超导材料的折叠交指低通滤波器设计,其折叠交指谐振器不仅自身具有椭圆函数低通特性,能够有效抑制高次寄生通带,而且通过折叠与交指结构实现了低通滤波器的小型化,便于与带通滤波器的集成。通过电磁(EM)仿真验证了该设计的可行性与有效性。该结构非常适用于小尺寸、低频低通滤波器的设计。
The traditional elliptic function low-pass filter based on the semi-lumped parameters of high and low impedance line to achieve elliptic function LC network, its size, especially for the low cut-off frequency of the low-pass filter, difficult to high-temperature superconducting wafers limited size Within the realization of the band-pass filter integration. A folded cross-finger low-pass filter design based on high-temperature superconducting materials is proposed. The folded cross-talk resonator not only has the elliptic function low-pass characteristic, but also effectively suppresses the high-order parasitic passband. By folding and interdigitated structure It realizes the miniaturization of the low-pass filter and facilitates the integration with the band-pass filter. The feasibility and effectiveness of this design are verified by electromagnetic (EM) simulation. The structure is ideal for small size, low-frequency low-pass filter design.