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In this paper, two compact microstrip filters using open-loop resonators are presented. The first one is a single-band filter designed at 5.2GHz with a fractional bandwidths of 7.5%, and the second one is a dual-band filter operating at 2.4GHz and 5.2GHz with fractional bandwidths of 10% and 9%, respectively. The effective sizes are reduced by using multilayer liquid crystal polymer (LCP) technology...
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