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High K material in High frequency

  1. Jul 27, 2017 #1
    Hello all
    I need a high K material to cancel out E-field in some direction (induced by electromagnetism). This high K material (above 5000) must work in high frequencies above 10MHz. I did use the ceramics but there is no clue that it will work in that range of frequencies or not.
    I am really stuck in this issue. I do not know can I use any meta-material or whatever for this performance or not.
    thanks
     
    Last edited by a moderator: Jul 27, 2017
  2. jcsd
  3. Jul 27, 2017 #2

    berkeman

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    Staff: Mentor

    What's "K"? What units are on the 5000 value?
     
  4. Jul 27, 2017 #3
    hi,
    means high dielectric constant (epsilon r, relative permittivity above 5000) at high frequency
     
  5. Jul 27, 2017 #4

    berkeman

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    How does a high dielectric constant material "cancel out" the E-field component of an EM wave?
     
  6. Jul 27, 2017 #5
    When you place it in specific direction you can increase the intensity in one direction( for example: when there is two peaks in electric filed intensity)....!!!
     
  7. Jul 27, 2017 #6

    berkeman

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    Sorry, that is not making sense so far. Can you provide a reference to what you are saying? A link or two to a description of this effect? That would help a lot...
     
  8. Jul 27, 2017 #7
    Please forget E-field...
    My problem : is there any capacitor( like ceramic one) can have relative permittivity (above 5000) at frequencies above 10 MHz?
     
  9. Jul 27, 2017 #8

    berkeman

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    5000 is very high for relative permittivity, but you probably know that. Have you researched the materials near the bottom of the Wikipedia article's table that have high values of ε_r like that?

    https://en.wikipedia.org/wiki/Relative_permittivity
     
  10. Jul 27, 2017 #9
    We could get Relative Permitivity around 5010 for 100Khz. But, I do not know would it work for Higher frequencies or not. I searched a lot but in most cases as frequency increase the relative prmittivity decreases (I think due to increasing the conducting!)
     
    Last edited: Jul 27, 2017
  11. Jul 27, 2017 #10

    berkeman

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    I did a Google search on capacitance versus frequency for different dielectrics, and got some good hits. Here is the hit list:

    https://www.google.com/search?q=cap...y+for+different+dielectrics&ie=utf-8&oe=utf-8

    This hit on the list looks promising::

    http://www.sciencedirect.com/science/article/pii/S2211379716000310

    Have you looked into renting or buying an impedance analyzer for your lab? If you are goint to be doing this type of characterisation more in the future, you could probably justify the costs based on what you are going to get out of the instrument. We use the HP 4194 Impedance Analyzer for these types of measurements in our lab:

    https://www.google.com/search?q=hp+4194&ie=utf-8&oe=utf-8

    http://literature.cdn.keysight.com/litweb/pdf/5952-7841.pdf?id=1319286

    Hope that helps your work.
     
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