+ Post New Thread
Results 1 to 3 of 3
  1. #1
    Advanced Member level 5
    Points: 30,042, Level: 42

    Join Date
    Dec 2004
    Location
    New England, USA
    Posts
    4,003
    Helped
    1086 / 1086
    Points
    30,042
    Level
    42

    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

      advertising

        
       

  2. #2
    Advanced Member level 5
    Points: 10,610, Level: 24
    WimRFP's Avatar
    Join Date
    Apr 2010
    Location
    Netherlands
    Posts
    1,571
    Helped
    570 / 570
    Points
    10,610
    Level
    24

    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

      advertising

        
       

  3. #3
    Advanced Member level 5
    Points: 11,858, Level: 26

    Join Date
    May 2010
    Location
    Santa Barbara
    Posts
    2,065
    Helped
    619 / 619
    Points
    11,858
    Level
    26

    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.



+ Post New Thread
Please login