The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
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> <firstname.lastname@example.org>
NNTP-Posting-Date: 19 Nov 2002 12:06:46 GMT
X-Mailer: Mozilla 4.78 [en] (X11; U; SunOS 5.7 sun4u)
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.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup