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Recent content by lydu

  1. L

    why inconsistent result of HFSS simulation and fomula calcul

    hi, I simulated the simple micraostrip trace on PCB with hfss 9.2 PCB :10mm X 5mm thickness:0.175mm Trace: 0.2mm/0.3mm/0.4mm fomula calculation Trace impedance respective: 60.82/49.56/42.01 ohm,corresponding to 50 ohm system VWSR should be: 1.22 /1.009/ 1.19 but hfss simulation VWSR is...
  2. L

    Need Help,hfss & Si8000

    Hi, I simulated the microstrip of PCB with Hfss and SI8000,but the result is different. PCB board high 0.175mm, FR4(Er=4.5), 50ohm trace width is 0.28mm with Polar SI8000 and 0.2mm with Hfss. why? thanks
  3. L

    How the HFSS caculates directivity?

    HFss Directiviy problem Hi, Who can tell me how the Hfss caculate directivity? why the directivity is so little(<1) in simulated microstrip antenna? the directivity always should be more than 1,it's true? thanks.
  4. L

    Looking for P4 or Athlon motherboard schematics

    Re: Mother Board Schematic CPU power supply should be +3.3V. you can check the datasheet of CPU.
  5. L

    two layer PCB can do this?

    2layer board will bring you EMC problem. Maybe the specification can't come true.
  6. L

    how can i know about the efficiency of my antenna?

    In practice, Antenna gain,the pattern is more important than efficiency. mormaly,Only attention the efficiency when antenna gain is low to doubt.
  7. L

    MSc. Thesis: Antenna simulations

    Donn't comprehend your mean.you explain you paper research content. Maybe someone can be help you.
  8. L

    Ansoft designer problem:microstrip antenna

    hi, everyone I simulated a microstrip antenna, process reports the S-parameter> 1.May I ignore it? thanks in adv. lydu
  9. L

    Another Hfss simulation problem

    Hi,asdfaaa Thanks for you replay,but the "bad matching + low Radiation Efficiency -> higher gain" lets me faint. Could you try the attchment model? another question, why Gain <-1dB for the antenna of Radiation Efficiency 0.96 and VSWR 1.6. where is the energy ? lydu
  10. L

    Another Hfss simulation problem

    Sorry, Suplement the Hfss file
  11. L

    Another Hfss simulation problem

    Hi, I have send a topic about antenna Directivity/Gain.Then i tried to look for the cause,another problem occur. Case1: frequcy = 2GHz, Caculation result is VSWR=1.71 Antenna Gain = -1.882dB Antenna Efficiency =0.96121 Case2: frequcy = 3GHz, Caculation result is VSWR=2.63...
  12. L

    Hfss simulation Gain problem

    Hi, everyone As I known, idea sphere pattern's Directivity is 0dB. if pattern isn't sphere, the max directivity should be more than 0dB. but i simulated a simple microstrip antenna,show the efficiency >0.9,directivity<0dB.Why? see : lydu
  13. L

    HFSS9.2 Problem,radiation efficiency>0.9 ,but max Gain&lt

    Hi, everyone I simulated a very simple antenna in attachment. As I known, idea sphere pattern's Directivity is 0dB. if pattern isn't sphere, the max directivity should be more than 0dB. who can explain the caculated result or point the error. thanks in adv! lydu
  14. L

    About CDMA specifications

    CDMA2000 :www.3gpp2.org WCDMA :www.3gpp.org
  15. L

    which is the best EDA software about System simulate?

    Hi,Bogyman Why SystemView is the first?
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