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Re: How to improve IMD performance of isolator - RF Cafe Forums

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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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glad to learn from you

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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.

_________________

glad to learn from you

Posted  11/12/2012

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