Choi, J.-S.; Min, B.-C.; Kim, M.-J.; Kumar, S.; Choi, H.-C.; Kim, K.-W. Design of a Common-Mode Rejection Filter Using Dumbbell-Shaped Defected Ground Structures Based on Equivalent Circuit Models. Electronics2023, 12, 3230.
Choi, J.-S.; Min, B.-C.; Kim, M.-J.; Kumar, S.; Choi, H.-C.; Kim, K.-W. Design of a Common-Mode Rejection Filter Using Dumbbell-Shaped Defected Ground Structures Based on Equivalent Circuit Models. Electronics 2023, 12, 3230.
Choi, J.-S.; Min, B.-C.; Kim, M.-J.; Kumar, S.; Choi, H.-C.; Kim, K.-W. Design of a Common-Mode Rejection Filter Using Dumbbell-Shaped Defected Ground Structures Based on Equivalent Circuit Models. Electronics2023, 12, 3230.
Choi, J.-S.; Min, B.-C.; Kim, M.-J.; Kumar, S.; Choi, H.-C.; Kim, K.-W. Design of a Common-Mode Rejection Filter Using Dumbbell-Shaped Defected Ground Structures Based on Equivalent Circuit Models. Electronics 2023, 12, 3230.
Abstract
An efficient design method is proposed for a compact common-mode rejection (CMR) filter utilizing dumbbell-shaped defected ground (DS-DG) structures and gap-coupled stub (GCS) resonators. A CMR filter for differential lines helps to improve the signal integrity of high-speed digital signals on printed circuit boards. The proposed CMR filter design is based on the equivalent circuit models, while the previous designs depended heavily on the DS-DG structure optimization using the EM simulations. The proposed CMR filter effectively reject the common-mode components with minimally affecting the differential signals. To prove the simplified design approach, a 5th-order Chebyshev band-stop filter has been designed with three DS-DG structures and two GCS resonators. From the simulated and measured results, it is found that the proposed CMR filter provides ~90% fractional frequency bandwidth with more than 20 dB of common-mode rejection ratio and less than 0.6 dB of insertion loss of the differential signal.
Keywords
defected ground structure; dumbbell-shaped; Chebyshev band-stop filter; common mode rejection filter; gap-coupled stub; electromagnetic interference; signal integrity
Subject
Engineering, Electrical and Electronic Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
