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Recent content by Chao Gu

  1. C

    Reconfigurable Frequency Selective Reflector design in HFSS

    Could you please let us know more about the Frequency Selective Reflector? Is it FSS layers beneath a planar monopole antenna?
  2. C

    Varactor power consumption

    Hi Brian, Thanks a lot for your reply. I understand better. I have another question. To bias a single varactor in the flowing figure (a), what is the function for the capacitor? I cannot get it as a DC blocker.
  3. C

    Varactor power consumption

    Hi, normally there is a Power dissipation parameter provided by the manufacturer. For example, SKYWORKS SMVA1248-079LF, the maximum Power dissipation is 250 mV. - - - Updated - - - So no one cares the power consumption of a varactor? What if I use a large number of varactors with high...
  4. C

    Varactor power consumption

    Hello everyone, I am working on the calculation of the power consumption of a varactor diode. Is the power consumption rated to the reverse leakage current when the varactor is correctly biased? Thank you for the help in advance.
  5. C

    HFSS: The value for radius of surrounding sphere in Hertzian dipole source

    if the patten is not so directive, maybe the HIS or PRS is not well designed. you may need to check the reflection coefficients of the unit cells using floquet mode in HFSS
  6. C

    HFSS: The value for radius of surrounding sphere in Hertzian dipole source

    Hi fsky, Maybe you could give us the title of the paper then someone may find a clue. a)For the dipole, I would try the radius 0.01 wavelength as it may be convenient for fabrication? b)If the impedance matching is not good, it may not only caused by the dipole, you may need to refer to some...
  7. C

    Want to Simulate Antenna Reception - quadrifilar helical - HFSS

    Hi Fred, I am doing similar projects as you. Could you please share your simulation model with me so I can verify my design? (gu.chao@msn.com) Thanks so much. Best regards, Chao:smile:
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    purpose of two PIN diodes in series

    Hi everyone, Does somebody know the purpose of using two PIN diodes in series as shown in the picture below? To increase the isolation? Thanks.
  9. C

    PIN-diode controlled variable attenuator

    Hello, I am simulating PIN diodes in ADS could you help me with the DC biasing circuit topology? Thank you.
  10. C

    ADS S11 optimization for two frequencies

    Thank you very much.
  11. C

    ADS S11 optimization for two frequencies

    Hi Is it possible to optimize the s11 at two frequencies simultaneously? Could anyone give a tutorial? Many thanks.
  12. C

    Why lumped element loading changes the electric length of an antenna?

    Can someone theoretically explain why capacitive loading decrease electric length and inductive loading increase electric length? Are there any papers and books to explain this? Thanks in advance.
  13. C

    How can I improve the radiation pattern of a monopole antenna placed on finite ground

    Thank you very much.
  14. C

    How can I improve the radiation pattern of a monopole antenna placed on finite ground

    I am simulating a monocone antenna working on 2-6 GHz but the E plane radiation pattern seems tilted at 5GHz. I place the antenna on a skirt( Radius 37mm ) which I don't want to change. How to decrease the elevation angle? Many thanks.
  15. C

    how to measure a varactor using a VNA

    Hello I'm working on measuring a varactor(Toshiba 1SV287FCT-ND) by using a VNA. I need to know the V-C and V-R character when operating at 2.4GHz. Can someone give me some details about the measurement? Many thanks. Here attached a sample figure.
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