Tapered Dual Plane Non-Uniform Electromagnetic Bandgap Filter Structures with Improved Pass-Band Performances

Abstract: In this paper, two new methods for the designing of Electromagnetic band gap low pass filter and Electromagnetic band gap (EBG) band stop filter have been proposed. In this paper a low profile 2-D EBG low-pass filter with a U-shaped transmission line is designed. By adopting the U-shaped geometry of the microstrip line the low pass design achieves a large stop band with small in-band insertion loss and optimum large out-of-band attenuation loss with the improved pass band performances within a miniature circuit area and for the band stop filter it is observed that the filling factor plays a significant role in shaping the stop band bandwidth and lessening in pass band ripples. In this paper a comparative simulation between traditional uniform patterned EBGs designs and tapered EBGs structure has been discussed on the basis of chiefly Kaiser Distribution in association with filling factor control parameter. In order to reduce the ripple level in the pass band, EBG structure is accompanied with Kaiser Window tapering technique. The discussed structures offer new techniques to design an improved low profile micro strip low pass and band stop filter for various GHz circuits.

Keywords: Band stop filters, Electromagnetic Band gap (EBG), Filling Factor, Kaiser Window Distributions, Low Pass Filter, Ripples and Tapering Technique