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用印刷电路来制作边缘耦合线滤波器的技术通常只适用于带宽在30％以下的滤波器。但本文所叙述的设计技术则消除了这一限制,并可以制作带宽接近100％的滤波器。它不是用平行耦合线直接级联,而是用平行耦合线和单根传输线相互级联,从而使特定带宽的滤波器电路尺寸易于实现。本文还给出了一些实例。
The technique of making edge-coupled line filters with printed circuits is usually only suitable for filters with bandwidths below 30%. However, the design techniques described in this article eliminate this limitation and can produce filters with nearly 100% bandwidth. Instead of being directly cascaded with parallel coupling lines, it is cascaded with parallel coupling lines and single transmission lines so that the filter circuit size of a particular bandwidth is easy to implement. This article also gives some examples.