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  1. #1
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    left handed transmission lines

    Am trying to make a microstrip transmission line as a delay line. I was initially intrigued by a couple of papers touting delay lines with very short phyical length but long time delays over a broad bandwidth. One paper touts 2 nS of delay in a 60 mm length.

    But when I take the papers and simulate them with Sonnet, I am getting nothing like the time delays the papers are quoting. I am only getting maybe twice what a standard 50 ohm transmission line would get, not the 10 x the time delay promised.

    Anyone else try to design a delay line with left handed elements, and did you succeed? Either I am doing something very wrong, or these papers are wildly over optimistic in their predictions!

    •   Alt30th September 2011, 19:02

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  2. #2
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    Re: left handed transmission lines

    Hello,

    In my opinion, such metamaterials that modifies er and ur are narrow band in nature, so you can't use them as a delay line for wide band signals. With "wide band" I mean BW/fc > 0.5.



    •   Alt5th October 2011, 16:17

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  3. #3
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    Re: left handed transmission lines

    Commercial delay lines are usually made of a meander stripline in a high-k dielectric. Try to look at Kyocera or other ceramic-makers.



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