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Recent content by guo-hai

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    capacitive loading theory

    Hi all, is there anyone know why capacitive loading can reduce antenna size? What is the theory behind this? Thanks
  2. G

    measuring dielectric constant in high frequency?

    i will check the web, thank you jiripolivka,. I am studying about IPD capacitor, and my first step is searching for the High K material, I'm using BSTZ ceramic as my material. Can you explain to me how to measure with the microstrip line? As I know microstrip lines can measure broaden...
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    using microstrip line to measure the dielectric constant ?

    Re: using microstrip line to measure the dielectric constant Hi Phytech, I dont know if you will see this or no, Can you tell me where did you get the formula for measuring the dielectric constant with the microstrip line? Thank you
  4. G

    measuring dielectric constant in high frequency?

    using capacitor just can be used in low frequency measurement , anyone can teach me how to measure dielectric in high frequency? maybe microstrip line?
  5. G

    About the dielectric, The E field and charge in the plate

    Hey guys, I know that adding a dielectric in a two plate can add the charge in the plate, so it can add the capacitance. But I have a problem, When we place the dielectric in the E field, there is a dipole moment which produce internal E ( E polarization ) that opposed the E field, so the E...
  6. G

    Quality Factor calculation

    yes, but my point is the first and the second expression will give you the same answer. I think there is a connection between these expression...
  7. G

    Quality Factor calculation

    oh, Thank you for reply FvM, I am working on a integrated inductor. Isn't the q factor the same to the circuit?
  8. G

    Quality Factor calculation

    what does that mean? I just want to know how the two formula can work.
  9. G

    Quality Factor calculation

    hi, as I know the quality factor definition is energy stored/energy dissipated. i found two formula to calculate it and got the same result 1. -Im(y11)/Re(y11) 2. Im(1/y11)/Re(1/y11) Is there any relation between these two formulas? and some other using impedance z to calculate it, is it just...
  10. G

    rectangle patch antenna with coaxial probe feed

    hello guys, can you help me? like the title i'm designing the antenna with HFSS but I didnt get any good result in S11 It's like that there isn't any signal going to the port can you guys help me look at it Thank you:-)
  11. G

    HFSS boundary condition

    Hello, Is there anyone know what is the difference of perfect E, perfect H, and finite conductivity? And when we must use it? or say which is more accurate ? THanks
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    Help! Dual band 2.4GHz/5.4Ghz monopole antenna

    i have tried using wave port.. i analyzed it, but it stopped.. it said that port refinement, process hf3d error. port 1 is assigned into internal face. Only allowed with lumped port....
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    Help! Dual band 2.4GHz/5.4Ghz monopole antenna

    actually, i still don't understand about antenna ... all i do is learning how to use the software and copy the sample drawing.. THanks mkonca...i will try using wave port... =D zorro, i dont really understand what you mean above... ANyway... do you have any reference (book, ebooks or website)...
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    laptop -mother board manufactures

    DELL, ACER, ASUS, HP, MSI.. i think there are too many more...

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