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TQWTL non-linear surface area increase
TQWTL non-linear surface area increase
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Old 9th July 2018, 03:37 PM   #1
sarte is offline sarte  Finland
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Default TQWTL non-linear surface area increase

Hi

I've been dabbling with transmission lines with couple of my projects and I've always tried to to make the line as linear as possible.

But I've also seen designs where the line is not linear like this one

Click the image to open in full size.

So my question is how important is it that the tapering is linear? If tapering is achieved with "sections" how will the end result be different from the sims?
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Old 9th July 2018, 09:40 PM   #2
Bjohannesen is offline Bjohannesen  Denmark
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In MJK's models it is easy to sim the sections.
I don't know which sim you use, but I am pretty sure this can be modelled in other models.

If you build it different from the sim - well the result will not be like the sim.

Please note you can taper in many ways. My QW sub has a loading chamber and a line with two different cross sections as a kind of taper.

Bjørn
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Old 9th July 2018, 09:58 PM   #3
planet10 is offline planet10  Canada
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TQWTL non-linear surface area increase
That has a stepped taper… a TL, but similar in concept to Olson/Nagaoka horns which work very well.

dabe
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Old 10th July 2018, 05:17 AM   #4
sarte is offline sarte  Finland
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Quote:
Originally Posted by Bjohannesen View Post
In MJK's models it is easy to sim the sections.
I don't know which sim you use, but I am pretty sure this can be modelled in other models.
Interesting. I've been using MJK's models but they are at least 5 years old. From your comment it seems that there has been some development to the worksheets since. It seems it's time to give MJK a another donation

Are there some obvious things that should be considered when designing sections or is the design process identical to traditional TQWTL?
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Old 10th July 2018, 09:52 PM   #5
Bjohannesen is offline Bjohannesen  Denmark
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Hi Sarte
Have you tried Corners Section of Martin's models?
Bjørn
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Old 10th July 2018, 10:08 PM   #6
GM is offline GM  United States
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Quote:
Originally Posted by sarte View Post
Are there some obvious things that should be considered when designing sections or is the design process identical to traditional TQWTL?
Converting a tapered TL into 'steps' only impacts it's high frequency response, which will be damped anyway, so usually just means that less added damping is required Vs the 'smooth' tapered sim.

GM
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