What should be the Shape of DGS and at which location DGS should be kept in Microstrip filter with Hairpin resonators?

18 June 2018 0 10K Report

I am Making 3 rd order Microstrip filter with Hairpin resonators for 3.7 to 4.2 Ghz. Where I should Keep DGS theoretically ? and Also which shape DGS should I keep? Is there any theoretical justification?

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