Wideband and Compact EBG Structure With Balanced Slots

We propose a new wideband and compact electromagnetic bandgap (EBG) structure with balanced slots (BS-EBG). In conventional EBG structures, a significant number of cells are required to ensure periodicity and to meet noise-suppression requirements. However, the large space requirements of conventional EBG structures limit their use in practical designs. The balanced slots force power/ground noise to pass through each and every EBG cell, improving the periodicity and thereby enhancing the noise-suppression characteristics. An analytical model for the proposed BS-EBG structure is developed based on a segmentation method and a cavity-mode resonator model. The proposed BS-EBG structure achieves a 111% improvement in the stopband bandwidth and a 73% size reduction over the conventional EBG structure. Finally, we suggest a simple method to avoid discontinuity in the return current path in the BS-EBG structure.