滤波器本身采用经典方法设计，通过在输入输出端口上添加交指型谐振器构成带阻滤波器，可将滤波器的适用带宽拓展50%以上。
The filter is designed by classical method with compact interdigital resonators at both input and output ports, which can extend the operating frequency bandwidth more than 50%.
该滤波器采用数个环形谐振器平行耦合，而输入输出馈线与环形谐振器之间采用直接耦合。
This filter USES several parallel-coupling ring resonators and direct-coupling structure between feed lines and rings.
该双通带滤波器包含两个方环形谐振器，它们位于不同层，并利用同一输入输出耦合结构实现双通带滤波器。
The dual-band filter consists of two dual-mode resonators with rectangular- loop perturbation on different layers, which need only single input and output.
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