Novel Planar Electromagnetic Bandgap Structures for Mitigation of Switching Noise and EMI Reduction in High-Speed Circuits

Abstract

Abstract-Planar electromagnetic bandgap (EBG) structures with novel meandered lines and super cell configuration are proposed for mitigating simultaneous switching noise propagation in high-speed printed circuit boards. An ultrawide bandgap extending from 250 MHz to 12 GHz and beyond is demonstrated by both simulation and measurement, and a good agreement is observed. These perforated EBG-based power planes may cause spurious and unwanted radiation. In this paper, leakage radiation through these imperfect planes is carefully investigated. It is found that the leakage field from these planar EBG structures is highly concentrated around the feed point, and the field intensity is attenuated dramatically when passing across several periods of patches. A novel concept of using these EBG structures for electromagnetic interference reduction is also introduced. Finally, the impact of power plane with EBG-patterned structures on signal integrity is studied. Index Terms-Electromagnetic bandgap (EBG), electromagnetic interference (EMI), signal integrity (SI), simultaneous switching noise (SSN).

Curved uniplanar EBG structure for suppressed ground bounce noise and improved signal integrity in power planes

“…As shown in Fig. 8, a signal trace of 30 mm passing from the first layer to the fourth layer and back to the first layer through via transitions was employed [12,13]. The second layer was the EBG power plane, and the third layer was the solid ground plane.…”

Vertical Cascaded Planar Ebg Structure for SSN Suppression

“…The maximum eye open (MEO) and maximum eye width (MEW) are used as metrics of the eye pattern quality [20]. As shown in Figure 7(a), the six-layer PCB is designed with the middle of the four planes, namely, power, ground, ground and power.…”

Design and Analysis of a Novel Electromagnetic Bandgap Structure for Suppressing Simultaneous Switching Noise

“…The suppression bandwidth is still quantified by −30 dB bandgap. Because of the geometry difference, we did not use the meander-line EBG structure proposed in [12], where three cells exist between the input and output ports and the bandwidth is measured by −28 dB. The transmission properties are compared in Figure 4.…”

“…In high-speed digital circuits, the meander-line bridging is a novel design of the coplanar EBG structure. Developed from the L-bridged EBG structure, various meander-line EBG structures have promised a feasible and effective technique for SSN suppression [12][13][14].…”

“…Numerical simulations and experimental measurement are used to examine the performance of the novel design. Compared to conventional L-bridged EBG structures, the combination of slots and meander-line bridges of the MS-EBG structure achieves a bandwidth increase of 15% for an improved SSN suppression level of −66.4 dB [7,12,13]. The novel design also proves an omnidirectional SSN suppression and minimum influence on the signal integrity.…”