Techniques to improve sharpness and stop band rejection of Defected Ground Structure based low pass filter

We propose a new technique to improve the sharpness and stopband rejection. This paper presents a more sharper and wide rejection band low pass filter using Defected Ground Structure (DGS). In this work DGS is realize as a quasi-lumped inductance and the sharpness of cut-off has been controlled by varying the slot neck length and stop band rejection by varying the slot neck width. Such findings are useful for the design of a compact LPF with sharper cutoff and wide stop band rejection.