Simple Configurations for Second Order Bandpass Filters with Improved Selectivity on One Side

摘要

Simple configurations for two order bandpass filters with improved selectivity on one side are presented in this paper. This kind of filters use the modified open loop resonators with tapping line feedings. Through properly adjusting the coupling schemes, improved selectivity on lower or higher side could be obtained. It could be found applicable in many cases especially that higher selectivity is needed on one side of the filter together with the low insertion loss.