Differential- and common-mode radiofrequency interference filters based on complementary split ring resonators: a conduction and radiation impact analysis

Abstract

This paper aims to analyse the design techniques of differential transmission lines loaded with metamaterials. Specifically, complementary split-ring resonators were etched on the ground plane of a microstrip transmission line in order to mitigate both differential- and common-mode propagation in differential signalling. Several prototypes were manufactured and characterised in printed circuit boards. The topologies under test were measured and compared as radiofrequency interference filters, taking into account frequency response, signal integrity, and near- and far-field radiation impact with regard to a reference (solid ground) board.

Keywords:

• metamaterials
• complementary split-ring resonators
• radiofrequency interference
• differential-mode filter
• common-mode filter

Additional information

Funding

This work was supported by the Spanish Ministry of Economy and Competitiveness (MINECO) under Project [TEC2013-41996-R] and the Catalan Agency for Administration of University and Research Grants (AGAUR) [grant number 2014 SGR 375].