Microstrip Width Calculation for a Specified Char Impedance

[mesalem]

strip width calculation

There are many tools and applets out there making use of (W/d) ratios to calculate the specific microstrip width for a specified characteristic impedance. All these formulas take into acount a relatively big ground plane. What if the ground plane was tapered and not considered to be big enough. Are there any formulas that calculate the width of the line for a specific impedance?

The application of this is a microstrip tapered balun.

 

[boy]

microstrip calculation

I would use those tool as a initial value for full wave analysis. I think that is the best way for finite ground plane.

 

[mesalem]

microstrip width

But at the end of a balun, the ground plane strip width (bottom conductor) is as wide as the upper conductor. How does one account for these width given a desired characteristic impedance?

 

[joelo]

microstripwidth

I suggest you use the ADS to simulate that will be better!!

 

[flyhigh]

how to calculate microstrip impedance

Hi,

This might help.

flyhigh

 

[DJ]

Re: Microstrip Width Calculation for a Specified Char Impeda

It is a common problem. The best is to start with schematic simulation such as ADS or AWR or others. Next jump to an EM simulation. I like the Momentum of ADS, but there are others. In order to simulate an finit ground you have to define correctly the RF ports.

D.J

 

[djtommy]

Re: Microstrip Width Calculation for a Specified Char Impeda

Do anybody know how to know the actual size of a triangle sierpinski fractal antenna?
Does it related to the operational frequency or anythings else?

Hope to get reply from u all, thanks,

My e-mail ... djtommy_bigtank@yahoo.com

 

[zkmicrowave]

Re: Microstrip Width Calculation for a Specified Char Impeda

when Wu/Wb>11(Wu|:upper strip width,Wb:bottom strip width),we can consider the bottom strip as the infinite-width!if you want detail,you can
read "Microstrip Transmission Line With Finite-Width Dielectric and Ground Plane" by CHARLES E.SMITH and RAY-SUN CHANG

 

[djtommy]

Re: Microstrip Width Calculation for a Specified Char Impeda

Do anybody know the way to calculate the characteristic impedance of a sierpinski fractal antenna(triangle)?

And if i'm doing line-edge feed, how to calculate the dimension of the line?

 

[SAJ25]

have you any papers or text about Merchand Balun? please upload it!