Design of Microstrip Low Pass Filter with Defected Ground Structure

In this paper, a micro strip low pass filter has been designed having circular shaped defects on ground structure (DGS). For obtaining the proposed defected ground structure, two circular shaped defected ground structure are connected by slot in the ground plane and three such defects are used for obtaining the design. The cut-off frequency of the designed filter is 1.6 GHz which is useful for the purpose of L-Band cellular communication. The highest insertion loss of the proposed filter is 31 dB and maximum return loss of 79 dB is obtained. IE3D 14.1 simulation software is used for obtaining the result.