Wide Band Stop Response Using Interdigital Capacitor/CSRR DGS in Elliptical Microstrip Low-Pass Filter

Dristi  Singhal; Shreyanshi  Singh; Vipul Kaushal; Amit  Birwal; Kamlesh Patel

doi:10.1590/2179-10742020v19i4945

Authors

D. Singhal Department of Electronic Science, University of Delhi South Campus, New Delhi-110021, India https://orcid.org/0000-0002-8200-6857
S. Singh Department of Electronic Science, University of Delhi South Campus, New Delhi-110021, India https://orcid.org/0000-0002-0716-8776
V. Kaushal Department of Electronic Science, University of Delhi South Campus, New Delhi-110021, India https://orcid.org/0000-0003-1009-3936
A. Birwal Department of Electronic Science, University of Delhi South Campus, New Delhi-110021, India https://orcid.org/0000-0002-0050-3594
K. Patel University of Delhi - South Campus https://orcid.org/0000-0001-8645-5230

DOI:

https://doi.org/10.1590/2179-10742020v19i4945

Keywords:

Complementary Split Ring Resonator (CSRR), Defected Ground Structure (DGS), High impedance line, Microstrip filter, Mitering, Size reduction

Abstract

In this paper, a compact elliptic-response microstrip low pass filter (LPF) is presented with a wide stop-band using stepped impedance resonators. With high attenuation in the stop-band, the overall size reduction of the proposed filter is achieved using a novel defected ground structure technique using an interdigital capacitor and complementary split ring resonator (CSRR). A 4.2 GHz LPF is designed and simulated on FR4 substrate and a stop band of 8.8 GHz is obtained by utilizing interdigital and complementary split ring resonator. Results further show that the use of U-shaped high impedance line on the top layer of filter enhances the stop-band bandwidth by 2.2 GHz. In the final design, the passband insertion loss is found below 0.5 dB, and –10 dB is obtained over a band from 5.06 GHz to 17.06 GHz between input and output ports. The normalized circuit size of the filter is 0.417´ 0.202 and the figure of merit is calculated about 55 at the cut-off frequency. These proposed LPFs have promised significant advantages in the stop-band characteristics with an acceptable roll-off rate for spurious-free communications.

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Wide Band Stop Response Using Interdigital Capacitor/CSRR DGS in Elliptical Microstrip Low-Pass Filter

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