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Re: How to Improve IMD Performance of Isolator - RF Cafe Forums

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Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


gangsway
Post subject: How to improve IMD performance of isolatorPosted: Mon Aug 31, 2009 5:21 am

Captain

Joined: Tue Nov 11, 2008 5:03 am
Posts: 11
Location: Shanghai, China
I am trying to improve the IMD performance of an old design isolator, band is 859to 904MHz, the outline dimension is typical 1inch housing. I chose ferrite G113 with dia=22mm and thickness=1mm. Appreciate your help?

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IR
Post subject: Re: How to improve IMD performance of isolator Posted: Mon Sep 07, 2009 1:58 pm

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello gangsway,

The reasons for IMD degradation in isolators are mainly due:

1. Unsuitable contact geometry.
2. Use of magnetic materials (e.g. Nickel) in the conducting direction (signal flow direction).
3. Contact contamination or oxidation.

I found this article which can be useful for you:

http://www.m2global.com/cbu/documents/I ... ropIns.pdf

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gangsway
Post subject: Re: How to improve IMD performance of isolatorPosted: Tue Sep 22, 2009 11:21 am

Captain

Joined: Tue Nov 11, 2008 5:03 am
Posts: 11
Location: Shanghai, China
Hi IR,

thanks for the linked articles. Appreciate more isolator circulator design relevant article from you. many thanks.

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glad to learn from you









Posted  11/12/2012

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