parallel coupled filter

hi guys,

i wanted to design parallel coupled filter. i having trouble in calculating the width and the saparation between two strip line. Obtained:
Dielectric constant ,er= 2.55
Thickness, H=0.5inch
Even mode impedance=82.53ohm
odd mode impedance =37.6ohm

appreciate your help. thanks

Hello danesh,


I have used the following website link for calculating coupled stripline...
http://www.ideaconsulting.com/dstrip.htm

Enter dimensions:
Trace width (W) 90 mils
Trace thickness (T) 1.5 mils
Trace spacing (S) 7.5 mils
Distance between planes (B) 500 mils
Relative Dielectric constant (Er) 2.55

Differential Trace Impedance 82.3 ohms

Also you can use for other Transmissionline calculations a free TXLINE from AWR
http://web.awrcorp.com/Usa/Products/...cts/TX%2DLine/

By the way AWR Microwave Office has good number of Stripline circuit models which will be useful for quickly designing circuits....


---manju---

you can also use ADS