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本文提出非均匀介质中的传输线(例如倒置和悬置微带线)平行耦合谐振滤波器的改进设计方法。采用了修正的滤波器节,它是由开路平行耦合线节和非耦合短线级联而成。因而无论是通带和阻带特性都有很大改善,而且很大程度上克服了由于非均匀耦合节的奇、偶模相速不同所造成的困难。
In this paper, we propose an improved design method for parallel coupled resonant filters in transmission lines (such as inverted and suspended microstrip lines) in inhomogeneous media. A modified filter section is used, which is made up of open parallel coupling sections and uncoupled short sections. Therefore, both the passband and stopband characteristics have greatly improved, and to a large extent overcome due to non-uniform coupling section odd, even mode caused by the different speed of the difficulties.