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From: The Technical Manager
Subject: Re: Replacing two microstrip stubs with one
Date: Tue, 19 Nov 2002 12:06:46 +0000
Organization: Microwave Department
References: <3DD4F2ED.DD32B937@niobiumfive.co.uk> <email@example.com>
NNTP-Posting-Date: 19 Nov 2002 12:06:46 GMT
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Tom Bruhns wrote:
> The Technical Manager wrote in message news:<3DD4F2ED.DD32B937@niobiumfive.co.uk>...
> > I have a microstrip transmission line that has two short circuited stubs
> > connected to it at the same point which radiate off in opposite
> > directions to each other so that the interconnection point is a cross
> > junction. Each stub has a different characteristic impedance and
> > electrical length. I want to replace these two stubs with a single short
> > circuited stub. How do I find the correct characteristic impedance and
> > electrical length of the replacement stub ? Does a formula exist to
> > calculate this ?
> The topology you describe may well be designed to block one frequency
> by reflecting a short to the line (a harmonic? an image frequency? an
> interfering signal?) and at the same time look like an open circuit
> (so it has essentially no effect on the line) at another frequency.
> You won't do that with a single stub.
So it is impossible after all.
I am sure that somewhere I read that it could be done and had a design equation for it.
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