micrwave circulator ,isolator

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mzewani

Joined: 21 Feb 2002
Posts: 43
Helped: 1

16 Jan 2003 16:28 isolator circulator philips

is there who can help in designing such devices or any link to some application notes about these devices
Many thanks

Element_115

Joined: 23 Mar 2002
Posts: 359
Helped: 23

16 Jan 2003 22:04 lecturer notes on isolator and circulator

Circulator and Isolators are usually bought and not made, unless your company makes them. this link shows many companies that build
Circulator and Isolators, should have some app notes.

www.rfcafe.com/vendors/components/couplerdivider_links.htm

Good luck

owell

Joined: 30 Mar 2002
Posts: 32

16 Jan 2003 22:47 circulator lecture

I guess textbook would briefly explain some detail.

g579

Joined: 01 Jan 1970
Posts: 476
Helped: 14
Location: Somewhere

16 Jan 2003 23:34

Any Microwave Handbook or a more basic electronics handbook describes the topic. But if you have not tried before I would advise not to try building these components. It is really difficult if you do not have many years of experience.

ttosolee

Joined: 16 May 2001
Posts: 74

17 Jan 2003 9:50

search AN98035 using google.
You can find one application note from philips semiconductor.

"Circulators and Isolators, unique passive devices", 31pages.

yingyang

Joined: 26 Dec 2002
Posts: 217

17 Jan 2003 16:15 circulators & isolators

There are many simple methods to design them.....
In fact, there are several novel method proposed in the IEEE MTT. Scan the IEEEXplore for more info....

sviodo

Joined: 02 Jan 2002
Posts: 90

17 Jan 2003 16:53

simple methods you say, hmm... do you have any working project and measured data to show? because i wouldn't call circulators/isolators easy to do devices especially if you consider loss.

Regards,

g579

Joined: 01 Jan 1970
Posts: 476
Helped: 14
Location: Somewhere

18 Jan 2003 17:38

Agree with sviodo. No such thing as simple isolator or circulator design exists.

goxy

Joined: 25 Jul 2002
Posts: 268
Helped: 1

19 Jan 2003 2:18

See this XFDTD circulator example.
http://www.remcom.com/html/circulator.html

sviodo

Joined: 02 Jan 2002
Posts: 90

19 Jan 2003 13:26

and i'll say regarding simple design idea - see losses of this circulator, coz performance IMHO is poor...

Regards,

Timelord

Joined: 04 Aug 2001
Posts: 32

22 Jan 2003 0:21 DEsigning Circulators

It depends on the application how successful you will be. If you can stand a bit of loss in your system then it's OK and you will not spend 6 months trying to optimize it. I have had some success printing ferrite loaded pastes onto ceramic.

If you need best performance then I agree with other posts in this topic - buy one!!!

Timelord

dd21

Joined: 23 Jun 2002
Posts: 21

22 Jan 2003 5:58

My thesis was on that topic. What is your target frequency, power, bandwidth, loss and size requirement. First at all, you need to know how much you would pay for each one. The military class isolator/circulator can be as much as $200. If you just need a few, you can buy from some company, MA/COM is a good one. Usually, circulator is substrate dependent. Even you want to make circulator yourself, you need to find a good sourse of substrate, such as YIG.

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22 Jan 2003 5:58 Ads

hobbymat

Joined: 16 Feb 2003
Posts: 35

16 Feb 2003 13:51

Timelord,
Could you share more information on printing the ferrite paste on ceramics? The idea seems good, if there's enough accuracy.

Other thoughts: if you're going to make an isolator or a circulator, you'll need a huge bunch of expensive machinery in addition to the simulators and a nework analyzer: an accurate CNC mill (for the waveguide isolators and general mechanics), a good diamond saw and grinder lathe (for shaping the ferrite pieces, round or triangular) and a magnetizer for fine-tuning the magnets. Not a one-weekend project. Smile

OK, most of these tools can be made in a (hard-core?) hobbyist-level as well, but it's still not going to be simple. Very educating, though, and you might be able to make a small business out of that experiment as well. Smile

Hobbie

razavipour

Joined: 12 Aug 2007
Posts: 15
Helped: 1

14 Aug 2007 7:51 micrwave circulator ,isolator

you can search in this book:
microwave engineering
pozar

Saifullah

Joined: 24 Mar 2008
Posts: 8

24 Mar 2008 6:40 Re: micrwave circulator ,isolator

A lecture notes file is attatched

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ND

Joined: 25 Sep 2007
Posts: 53
Helped: 12

24 Mar 2008 15:51 Re: micrwave circulator ,isolator

Can you list contents?

menz

Joined: 14 Feb 2008
Posts: 50
Helped: 4

07 Jun 2008 20:55 micrwave circulator ,isolator

can sum1 help me about designing in hfss?
circulator,isolator (wave guide)

byteptr

Joined: 29 Apr 2008
Posts: 112
Helped: 11
Location: Europe

09 Jun 2008 8:49 Re: micrwave circulator ,isolator

Here you have a paper about an example of circulator with a called 'isoductor' component.

Enjoy

I found the original article in the web:

[url=http://duepublico.uni-duisburg-essen.de/servlets/DerivateServlet/Derivate-14694/Final_Papers/GM0050-F.pdf][/url]

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