Microstrip Low Pass Filter using Defective Ground Structures
Jilna T Joy1, Sumi M2, Harikrishnan A. I.3

1Jilna T Joy, NSS College of Engineering, Palakkad (Kerala), India.
2Sumi M., NSS College of Engineering Palakkad (Kerala), India.
3Harikrishnan A. I, NSS College of Engineering, Palakkad (Kerala), India.  

Manuscript received on 13 June 2017 | Revised Manuscript received on 20 June 2017 | Manuscript Published on 30 June 2017 | PP: 45-48 | Volume-6 Issue-5, June 2017 | Retrieval Number: E5001066517/17©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: Low pass filter forms the primary and vital component of a transceiver system. Three different methods to design compact microstrip low pass filter are discussed in this paper. All three prototypes contain defective ground structure (DGS) in the ground plane. Type I filter structure is designed with three fingered interdigital slot the ground plane. Type II low pass filter design contains circular DGS pattern, while type III low pass filter consist of many fingered interdigital slots on ground plane. Interdigital slot consists of metal fingers, which enhances the performance of the filter. The resonant frequency can easily be changed by tuning the length of the metal fingers. Based on the comparative study, it is found that the insertion loss is minimum for type III filter design i.e. 0.1dB. The return loss is found to be 26dB, 35.8dB and 21dB for type I, type II and type III low pass filter respectively
Keywords: Low Pass Filter, Defective Ground Structure, Interdigital Slots, Insertion Loss, Return Loss

Scope of the Article: Microstrip Antenna Design and Application