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I would like to design a waveguide circulator. I tried to design one but, my attempt was not successful. My design used a cylindrical cavity with ferrite as region. I then connected 3 waveguides in 0,120 and -120 directions. Upon applying the excitation, I got a pathetic result. I have referred to some more resources but can not resolve this problem. Has anybody tried this before?

My design and its parameters are shown below

Waveguide circulator design

  • Frequency of operation: 915 MHz
  • Dielectric permittivity of material(ferrite): 14.2
  • The height of cylinder: 5.5 mm
  • Radius of cylinder 30 mm
  • The waveguide cross section a = 20 mm
  • The waveguide cross section b = 2.5 mm
  • The length of waveguide l = 50 mm
Chris Mueller
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sumith
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  • Hi Sumith, to assist those who might be able to answer your question it would be helpful if you could provide links to the references you mention in your question – Fred Apr 20 '15 at 06:05
  • They are some whitepapers. I can't disclose them. Sorry for that. But I can add my design with parameters I have used. Could you please wait for little time? – sumith Apr 20 '15 at 06:22
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    A waveguide with such tiny dimensions is going to have a lower cutoff frequency on the order of 10 GHz or so. See [this table](http://en.wikipedia.org/wiki/Waveguide_(electromagnetism)#Waveguide_in_practice). Why do you think it would be effective at 915 MHz? In any case, you'd probably get a more thorough answer on this on [EE.SE](http://http://electronics.stackexchange.com/). – Dave Tweed Apr 20 '15 at 11:35
  • @DaveTweed, Sir, you are right. I calculated the same again. For 915MHz, the cross section 'a' should be more than 16cm. However I like to know how I can construct circulator with waveguides. Thank you. – sumith Apr 21 '15 at 06:22

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