Abstract
This paper presents analysis and design of a compact ultra wide band (UWB) filter using three parallel folded coupled lines in a defected ground structure in multi-layer structure. Defected ground has been incorporated under the coupled lines of the filter to improve the coupling over a wide bandwidth. The closed form expressions for even and odd mode impedances for the coupled lines with defected ground have been obtained to design a filter of desired bandwidth with the proposed structure. Based on circuit models, an UWB filter for 3.1– 10.6GHz has been analyzed and the results have been compared using full wave simulations. Analytical results are satisfactorily matching with simulations. Filter exhibits a constant group delay of ± 0.08 ns in the pass band. Size of the filter is 6.2mm× 3.4mm× 2.8mm. Corresponding author: D. Packiaraj (dpackiaraj@bel.co.in). 112 Packiaraj, Vinoy, and Kalghatgi
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