Strip width of the fourth section of microstrip rat-race circuit

[max232]

The usual microstrip rat-race circuit constitus with tree adjacent sections are each lamda/4 , wile the fourth section is 3*lamda/4 .

How to find W (strip width ) of the four sections .?

 

[AL0117]

Re: Rat-race Design

Hi,

Check the link below. There is an on-line simulator too.

hxxp://www.ee.bilkent.edu.tr/~microwave/programs/magnetic/hybrid/hybrid.htm

(replace x with t)

rgds, Al

 

[midnite]

Re: Rat-race Design

If z0 is the impedence at the four ports, the ring has an impedence of sqrt(2)*z0

 

[max232]

Re: Rat-race Design

Thank you has you, I know that the ring has an impedence of sqrt(2)*z0.
I sought the width of the stip , according to the site, the study of the width it is the same one as a line microstrip..

the site it is well especially the part java, one finds calculations sought.

 

[Lupin]

Re: Rat-race Design

I need an 0-180 degrees hybrid component from 6 to 18 GHz..

It´s vrey important for me. Can anyone help me?

Thanks in advance.

Lupin

 

[flyhigh]

Re: Rat-race Design

Hi,

I don't really think you can make it with hybrid coupler (branch line or rate race). I think you should use some wideband balun and make your circuit around it.

These are two papers to give you the hint


flyhigh

 

[SAJ25]

Rat-race Design

thanks flyhigh these papers are so good in UB Baluns.
are you have the paper of 100:1 Baluns? in this paper the author claim the 100:1 band width with coaxial balun!

 

[eng_ahmed214]

Re: Rat-race Design

Hi all,,

Check This for Rat trace:
http://www.imodelit.com/ViewDetails.aspx?AID=97

and this for Baluns and Transformers:
http://www.imodelit.com/ViewProducts.aspx?CID=96

Enjoy !!

 

[SAJ25]

Rat-race Design

thanks eng_ahmed214
these links are good!

 

[shinka]

Rat-race Design

SAJ25 Do u still have the link for the above? It seems broken.

 

[Abhishekabs]

Rat-race Design

Hi max232
The width will depend on Impedance.
Let us assume I have Rogers substrate, with Er =2.3 & h=31 mil
Usually, for Rat Race, The Input is 50 Ohm so width is 2.2mm
& width of ring will be almost equal to 1.8 mm (impedance 70 Ohm)

They are simple microstrip calculations.

Abhishekabs

Added after 2 minutes:

Hi Lupin
If you have ADS, use DG component(template) for Hybrid design.
It will be comparitively much easier.
Also Rate Race can be designed in ADS using template.

Added after 3 minutes:

Also check this
**broken link removed**

 

[SAJ25]

Rat-race Design

hi shinka
i used those links and they both are correct

 

[khaldoon99]

Re: Rat-race Design

Hi all,
i am working at Rat-race coupler and i have a problem in calculation raduis of the ring in ADS design, i saw that it should be squre(2)Zo but i think it's not correct!!!
i attached the figure of design

 

[Lupin]

Re: Rat-race Design

Hello people, I need to design a rat-race in C (5.03 GHz) band.

What technology do you suggest in terms of losses and weight? Stripline, WG or coaxial line?

Thanks for your support.

Lupin