Enhanced power plane with photonic band gap structures for wide band suppression of parallel plate resonances

In high speed digital circuits, with high clock frequency and resulting fast rising and falling time, simultaneous switching noise (SSN) has become a major concern for EMI/EMC engineers. The use of power planes containing low period photonic band gap (PBG) structures has been proposed for SSN suppression (Tzong-Lin Wu et al., IEEE Microwave and Wireless Components Letters, vol.14, p.337-9, 2004). Though this structure shows wide bandwidth, it cannot suppress SSN in the frequency range below a few GHz. We propose an enhanced power plane employing PBG with meander line. The advantage of proposed power plane is an efficient suppression of resonances in a broader bandwidth than conventional methods. Therefore, the proposed structure is useful in high frequency digital circuits and systems. Compared with a reference board, the proposed power plane has a band gap from 0.4 GHz to 3.8 GHz and highly efficient suppression with minimum -30 dB, and maximum -100 dB. The bandwidth of the proposed structure is broader.