Printed Wideband 90 deg Coupler Design

[mesalem]

90° coupler design

HI,

I need help designing a 90deg Directional Coupler for 2-18GHz. I will be using HFSS. Has anyone done this before. Does anyone have any HFSS project files to share.

Thank you

 

[sinatra]

wideband 90 deg coupler

Are you talking about a microstrip coupler?

You can try this page to get dimensions for the type of substrate you have.

h**p://people.web.psi.ch/gaspar_m/cgi-bin/mwtools/mwtools.html

S.

 

[mesalem]

simulation ultra wideband coupler using ads

Thanks Sinatra,

I am looking for Microstrip or Stripline...

That link you mention is not for wideband couplers unfortunately.

 

[nandopg]

wideband directional coupler tandem

You can find very good information on wideband coupler design on this book: Stripline Circuit Design by Harlan Howe, Jr edited by Artech House.

I have the book but unfortunately I don't have it in electronic format.

NandoPG

 

[mesalem]

broadband tem coupler

If nobody has any HFSS coupler projects, does anyone have any e-books or pdfs on the topic.

 

[nandopg]

wideband coupler

The topology you should search for is an asymmetric tandem connection of a symmetric array of coupled line.
With three coupled lines in cascade (symmetric array) tandem connected to one coupled line (asymmetric connection) you will be able to get the bandwith you need.
For synthesis of coupled line you can take a look on the book Foundaitions for Microwave Engineering by R. Collins. This book was uploaded here and the link is:


NandoPG

 

[mesalem]

printed 3 db coupler design

I have a question regarding the tandem connection of of two -8.34 dB couplers to create -3dB coupler.

Why is this done? Why can't a -3dB coupler be directly designed? My guess is probalby to achieve larger bandwidth or possibly to achieve 90 deg phase shift.

Any one got any comments?

 

[flatulent]

microwave collins

The tandem method keeps the coupling low between the coupled lines in each coupler which is easier to do mechanically.

 

[mesalem]

make 3db coupler

I appreaciate your response, but can you elaborate, I still don't understand why we can't do just one -3dB coupler. What do you mean 'keeps the coupling low', and 'easier mechanically'?

 

[KMPA]

wideband coupler line coupler

Hi Salem,

How Are you? I hope you are fine.
I believe that you are lookin for this Coupler.

Regards

 

[artik]

articles/2001jun/2001jun05_rfd_an1897.pdf

try this website
**broken link removed**

 

[Gallen]

synthesis broadband quadrature couplers

Hi guys,

Currently i am doing thesis on ultra wideband quadrature couplers... i am kinda lost...is there any good links or anyone who can offer me good advice...please drop me a msg

Thanks

 

[haydar]

wideband tandem coupler dimension

I have a design for 64 MHz.

 

[borich_03]

wideband coupler design

I have a design for 64 MHz.

I just simulated your model. It's not a wideband coupler.

 

[flyhigh]

8.34db coupler design

Hi,

does anyone has some experience in forward coupler design? This type should have large bandwidht.

flyhigh

 

[Terrorhertz]

8.34db broadband coupler

The following paper discusses a coupler that I would like to make but doesnt seem to give clear instructions form a designers point of view.

"Improvements in ultra broadband TEM coupler design" IEE proceedings vol.139 No2 April 1992

Added after 1 minutes:

I forgot to attach it! Here it is.

 

[tapmicrowave]

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