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Simulation of adding PGS with Inductor

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SJW2018

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hi,guys

i simulate a inductor with PGS floated in momentum environment to verify if pgs
can improve the q value of inductor,but i can not find any improvement,why?can anybody help me sovle this problem?
port1 ,2 is the inductor port,3,4 is the pgs gnd port,and metal M1 is used for patterned ground shield.


pgs_2D.PNG
PGS_3D.PNG
L value.PNG
Q.PNG
 

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