<abstract xmlns="http://www.w3.org/1999/xhtml"><p>This contribution presents, for the first time, the design of microwave lowpass filter with ultrawide stopband and low insertion loss based on the log-periodic zig-zag defected ground structure (DGS); the design is specifically evolved from the principle of the log-periodic line antenna and the slotline based DGS. Based on the log-periodic property, studies show that ultra-wideband suppression can be realized by increasing the flare angle or the angle subtended by each element of the slotline DGS. The developed filter therefore shows low insertion loss of 0.7 dB within the passband, sharp transition between the passband and the stopband and ultra-wide suppression band from 2.61-26.5 GHz with a 20 dB suppression level. The DGS architecture is simple and easy to realize, and the design is thus useful in many microwave applications. The fabricated prototype filter validates the study, both from simulations and from measurements.</p></abstract>

This contribution presents, for the first time, the design of microwave lowpass filter with ultrawide stopband and low insertion loss based on the log-periodic zig-zag defected ground structure (DGS); the design is specifically evolved from the principle of the log-periodic line antenna and the slotline based DGS. Based on the log-periodic property, studies show that ultra-wideband suppression can be realized by increasing the flare angle or the angle subtended by each element of the slotline DGS. The developed filter therefore shows low insertion loss of 0.7 dB within the passband, sharp transition between the passband and the stopband and ultra-wide suppression band from 2.61-26.5 GHz with a 20 dB suppression level. The DGS architecture is simple and easy to realize, and the design is thus useful in many microwave applications. The fabricated prototype filter validates the study, both from simulations and from measurements.

Design of microwave lowpass filter based on log periodic zigzag DGS

Department of Electronic and Information Technology

Jiangmen Branch, China Mobile Group Guangdong Co., Ltd.

School of Physics, University of Electronic Science and Technology of China

Electrical /Electronic Engineering Department

Journal of Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

{"article-title":"Design of microwave lowpass filter based on log periodic zigzag DGS"}

This contribution presents, for the first time, the design of microwave lowpass filter with ultrawide stopband and low insertion loss based on the log-periodic...

Design of microwave lowpass filter based on log periodic zigzag DGS

Published Online: Dec 24, 2020

Page range: 428 - 432

Received: Oct 24, 2020

DOI: https://doi.org/10.2478/jee-2020-0059

Keywords
log periodic, zigzag, slotline, defected ground structure (DGS), microwave filter

© 2020 Rong-Bin Chen et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Design of microwave lowpass filter based on log periodic zigzag DGS

Published Online: Dec 24, 2020

Page range: 428 - 432

Received: Oct 24, 2020

DOI: https://doi.org/10.2478/jee-2020-0059

Keywordslog periodic, zigzag, slotline, defected ground structure (DGS), microwave filter

© 2020 Rong-Bin Chen et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
log periodic, zigzag, slotline, defected ground structure (DGS), microwave filter