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Analysis of DGS Filters using π Circuit Model
  • Sambhav Malhotra,
  • Mohammad Hashmi
Sambhav Malhotra
Indraprastha Institute of Information Technology Delhi
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Mohammad Hashmi
Indraprastha Institute of Information Technology
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Peer review status:Published

28 Jan 2020Submitted to Engineering Reports
28 Jan 2020Submission Checks Completed
28 Jan 2020Assigned to Editor
05 Feb 2020Editorial Decision: Revise Major
12 Feb 20201st Revision Received
13 Feb 2020Assigned to Editor
13 Feb 2020Submission Checks Completed
10 Mar 2020Reviewer(s) Assigned
13 Apr 2020Editorial Decision: Revise Major
04 May 20202nd Revision Received
05 May 2020Assigned to Editor
05 May 2020Submission Checks Completed
05 May 2020Editorial Decision: Accept
02 Jun 2020Published in Engineering Reports. 10.1002/eng2.12196

Abstract

Two filters using Defected Ground Structures have been proposed. First, a multiple frequency band stop filter utilizing a semi-H defect in the ground plane is presented. This structure is then prototyped on a Rogers 4350B substrate of overall size 45 mm $\times$ 15 mm, and external SMD capacitors have been employed to control the resonance of the circuit, for the stopband frequencies of 433 MHz, 700 MHz and 915 MHz. An equivalent circuit is also proposed for this multi-band design. The second filter is a combination of a band-stop and band-pass filter in one structure. The filter, operating with a controllable passband and stopband frequency is fabricated, on Rogers 4350B lossy substrate, to validate the EM and circuit simulation results. Two SMD capacitors have been loaded in the filter to control the pass band and stop band frequencies of the filter with a structure size of 20 mm x 20 mm. Furthermore, a novel equivalent circuit model encompassing the band-pass and band-stop frequency response of the DGS based filter is proposed.