| Summary: | 碩士 === 國立中央大學 === 電機工程學系 === 101 === Abstract
The purpose of this thesis is to develop noise suppression structure in the power distribution network (PDN) based on printed circuits board (PCB). The mushroom-like embedded bandstop structure is used between the power and ground plane to achieve the required bandstop characteristic. A novel design method that is different from the conventional periodic electromagnetic band gap design is proposed. The proposed method is based on the bandstop filter prototype, and the conventional insertion loss method for filter design is employed to predict and optimize the bandstop structure efficiently. Therefore, both low impedance and wideband stopband can be easily achieved for the proposed bandstop structure.
First, the one-dimensional bandstop structure with center frequency of 2.07 GHz is designed and implemented. The measured results show that the 40 dB stopband isolation bandwidth is up to 110%, while the 60 dB stopband isolation bandwidth is up to 75%. The one-dimensional banstop structure is then expanded into two-dimensional designs so as to be implemented in PCB-based rectangular PDN. Three different application scenarios of the PDN are considered, and the corresponding two-dimensional designs are proposed according to the current path analysis, which are the surround-cross arrangement bandstop structure, hexagon arrangement bandstop structure, and trapezoid arrangement bandstop structure. They can suppress the propagation of the noise in the PDN effectively.
For the proposed bandstop structures, complete and systematic design procedure is proposed as effective design tools. Simple circuit model is also established to quickly predict the circuit response, and the simulated results are in good agreement with the measured ones. The measured results show that the proposed bandstop structure can suppress the high frequency noise in PDN effectively without breaking the completeness of the PDN structure.
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