1.5 环形谐振器
表1.1 三种新型宽带滤波器性能对比
    电路尺寸    带内插损    谐波抑制    带外选择性
SIR多模谐振器    较小    较小    一般    一般
级联滤波器    较大    较大    很好    较好
环形谐振器    较小    较小    较好    较好
    综上，新型的三种结构各自有其特点，针对宽带滤波器的设计需要及趋势，大大改善了滤波器的边缘选择性，带外抑制性及其抗干扰能力。
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