cs.gautam
Newbie level 6
Dear Friends,
I am designing Microstrip and Coplanar circuits using IE3D EM software.
I am using Lin-gauge in order to calculate the parameters like impedance, angle, width, Effective E.
When, i am calculating the same parameters through TLN parameters in IE3D then i am getting different results.
In case of Microstrip, results are same but in case of coplanar results are different.
I am using the differential ports (Advanced Extension/ Extension for MMIC) for coplanar.
I am giving you one example:
In order to design 50 ohm CPW on Rogers/Duroid (substrate thickness=.635, Er=10.8, Metal thickness=35um)
I calculated the W & S using lin gauge. The values are: W (width of the central Conductor) = 0.4mm and S (Spacing between two ground planes)=0.21.
Then i did the simulation through IE3D software, Then i calculated the value of line impedance through TLN Parameters and it came 67 ohm instead of 50 ohm.
What is the reason behind it? i do not know. I also calculated TLN Parameters at low frequencies (Less than 3 GHz).
I am designing Microstrip and Coplanar circuits using IE3D EM software.
I am using Lin-gauge in order to calculate the parameters like impedance, angle, width, Effective E.
When, i am calculating the same parameters through TLN parameters in IE3D then i am getting different results.
In case of Microstrip, results are same but in case of coplanar results are different.
I am using the differential ports (Advanced Extension/ Extension for MMIC) for coplanar.
I am giving you one example:
In order to design 50 ohm CPW on Rogers/Duroid (substrate thickness=.635, Er=10.8, Metal thickness=35um)
I calculated the W & S using lin gauge. The values are: W (width of the central Conductor) = 0.4mm and S (Spacing between two ground planes)=0.21.
Then i did the simulation through IE3D software, Then i calculated the value of line impedance through TLN Parameters and it came 67 ohm instead of 50 ohm.
What is the reason behind it? i do not know. I also calculated TLN Parameters at low frequencies (Less than 3 GHz).