design and simulation of circulator and isolator

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tshah

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do anybody has tutorial for designing and simulating a circulator and isolator?

I also, want to know what is the exact different between circulator and isolator?

it is kind of confusing. can somebody explain me with examples?

also, what is drop-in circulators/ isolators?

Thanks
 

David Pozar has done just what you asked. Look in his book "Microwave Engineering".
 

For a simple answer.

A two port circulator is isolator. If you terminate the third port of a circulator with a good load and use it for reverse isolation it is isolator.

usually circulators comes with N or sma connectors , to be connected with cables. A drop in circulator can be directly soldered to PCB/PWB.no connectors.


Regards
GV
 

hi gvvin,

do N / SMA connector circulator has different design than drop in circulator? Also, did you mean that a circulator can work as an isolator in reverse direction? That means that if I apply power at port 2, the power coming out at port 1 will be less than 20 or 40 dB. That's what I understood. Please clarify my doubt.

Thanks
 

Hi,

No , Only the size will be smaller and leads will be there to directly mount to PCB.Design will be same using magnets and ferrite material .

A Circulator is a 3-port ferrite device used to route microwave signals from one port to another, Port 1-> Port 2, Port 2 -> Port 3, Port 3 -> Port 1.

An Isolator is basically a circulator with port 3 terminated. It becomes a 2 port device which transmits a signal in port 1 and out port 2. Any reflected energy or any signal entering port 2 will be routed to port 3 where it is absorbed. Thus port 1 is "isolated" from port 2.

Hope this clarifies.
You can search for circulators and isolators from websites.
**broken link removed**

Regards
GV
 

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    tshah

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