LOW NOISE GENERATION OF RFI NOISE SUPPRESSION FILTER FOR POWER TRACE BY USING QUARTER-WAVELENGTH OPEN-STUB RESONATOR IN MULTILAYERED HIGH-SPEED DIGITAL PCB

This work proposes a radio-frequency interference (RFI) noise suppression filter with low noise generation for a power trace. This is based on a quarter-wavelength open-stub resonator (QWOSR) in a multilayered high-speed digital PCB (printed circuit board). RFI noise with frequencies at 2.4 GHz and 5 GHz is considered. The proposed filter structure is a four-layer PCB. The low noise generation includes the following schemes. The trace of the QWOSR is a stripline on the third layer. Four ground vias are added adjacent to the QWOSR via, which is short. Electromagnetic (EM) radiation noise plan cavity resonance, ground bounce noise (GBN), and peak noise on insertion loss (|S21|) are all reduced. The electric field distributions are elucidated to understand the effect of cavity resonance on the insertion loss (|S21|) values of the proposed filter structure. The proposed filter structure significantly reduces the time-domain ground bounce and power noise whose frequency is equal or close to the center frequency of filter. Finally, favorable comparisons between simulated and measured results confirm the excellent low noise generation performance of the proposed filter structure.