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When working with paralell (edge) transmission line coupled filters, the first and the last resonator usually require a very small coupling gap to input and output lines. This might couse technological problems. In order to avoid this, input and outputs are connected directly to a first resonator at some "tapped" position along the line. This is just to give you a hint what it is all about, you can read more in the book by Hong - Microstrip filters for RF microwave application, it can be downloaded on this site.
this is a way to model the input/output of a filter. In particular it consist in a high impedence connection with the first /last resonator of the filter. The connection point have to be optimize.
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