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

Authors

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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Published

2020-10-15

How to Cite

Singhal, D. ., Singh, S. ., Kaushal, V., Birwal, A. ., & Patel, K. (2020). Wide Band Stop Response Using Interdigital Capacitor/CSRR DGS in Elliptical Microstrip Low-Pass Filter. Journal of Microwaves, Optoelectronics and Electromagnetic Applications (JMOe), 19(4), 495-509. https://doi.org/10.1590/2179-10742020v19i4945

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Regular Papers