Abstract
The design of planar filter using stepped impedance type distributed synthesis has been proposed for 8.6–9.5 GHz frequency band. To improve the return loss characteristics, instead of using traditional defected ground structure (DGS), the combination of fractal geometry and DGS, known as ‘fractal DGS’ has been embedded in the ground plane of the filter. The filter using fractal geometry gives 65% better return loss as compared to filter without DGS. Three laboratory prototypes (without DGS, first iteration DGS and second iteration DGS) have been developed to validate the simulated and measured results. The measured results are agreed with simulated one.
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