Compact Configuration for Common Mode Filter Design based on Planar Electromagnetic Bandgap Structures

Common-Mode Suppression Design for Gigahertz Differential Signals Based on C-Slotline

“…Regarding the common-mode suppression design in [8], the proposed common-mode filter has a larger fractional bandwidth and a simpler structure, while the suppression level and the electrical size are worse than those in [8]. The deep common-mode suppression level (with |S cc21 | < −20 dB) of the common-mode filter ( [1,6,8]) is better Table 3. Characteristic of the proposed common-mode filter compared with previous literatures.…”

“…In [7], a common-mode filter consisted of meandered signal pair and an improved mushroom-type cell embeded in a PCB or package substrate is proposed to efficiently reduce the EMI, but four layers and two metal vias are needed resulting in a complex design and high cost. The common-mode suppression behavior is also investigated based on planar electromagnetic bandgap structures by Orlandi et al in [8]. Besides, the artificial transmission line [9] and the multilayer liquid crystal polymer technology [10] are used in the common-mode suppression as well, and the balanced bandpass filters based on them are successfully designed.…”

“…Compared with the previous work [1,2,6] which all implemented on 2-layer PCB, the proposed structure has the smallest electric size as well as the maximum fractional bandwidth. Moreover, the proposed common-mode filter has the advantages of simple configuration design in contrast to the previous design in [2,3,[6][7][8][9]. This paper is organized as follows.…”

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

“…In practice, small asymmetries caused by trace length, time skews or imbalances between the two transmitted signals lead to the conversion of some of the differentialmode (DM) signals into common-mode (CM) ones, which can critically affect the electromagnetic compatibility (EMC) performance of high data-rate transmission in high-speed digital electronic buses and circuits. Various compact common-mode filters based on metamaterials such as electromagnetic bandgaps (EBGs) [1] or negative-permittivity metamaterials [2] have been presented to overcome this issue.…”

Simultaneous out-of-band interference rejection and radiation enhancement in an electronic product via an EBG structure

“…EBG structures, either planar or three-dimensional, have been proven able to filter EM noise from transmission lines and PCBs [2]- [4]. In fact, either the lines couple to the resonant structures of the EBG so that the energy of the propagating unwanted mode is reduced, or the EBG proves able to suppress the parallel plate resonance possibly occurring, e.g., between the power and ground planes [5].…”