Non-Periodic Flipped-SIR EBG for Dual-Band SSN Mitigation in 2-Layer PCB

In order to offer simultaneously switching noise (SSN) mitigation for dual WLAN bands in PCB of only two metal layers, this paper proposes a novel flipped stepped-impedance-resonator electromagnetic bandgap (FSIR-EBG) structure with its 2 × 2 modified non-periodic combination. An equivalent circuit model is also developed to investigate the EBG design concept, whose stopband performance is enhanced by the theory of stepped-impedance resonator and the slot resonance. The unit cell of 2 × 2 modified non-periodic EBG combination can suppress SSN of both 2.4-3.1 GHz and 4.5~6 GHz bands with best suppression level up to 30 dB and 50 dB, respectively, and the simulation results agree well with the measurement.