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Recent content by young.microwave.eng

  1. Y

    microstrip filter design question

    hi all I'm going to design a microstrip bandpass filter using microwave office software.the filter pass band is:9525~9625 MHz.would you please tell me that which filter type is approperiate for my job? for example?hairpin?interdigital?? thanks in advance
  2. Y

    0/3volt to 0/5 volt level converter

    hi all i'm going to translate the 0/3.3V pulse to 0/5V pulse with frequency of 2kHz.the circuit should derive 1.5A current.I meant the part is the interface between a 3.3V and 5V system and should deliver a current about 1.5A to the 5V system
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    how to calcute antenna dimensions for cpw fed microstrip patch antenna for UWB antenn

    hi maybe this software from Q-PAR company can help you
  4. Y

    0.5 to 4.5 ghz limiter for 0dbm using PIN diode

    hi please study this handbook.it is very usful www.qsl.net/n9zia/pdf/pin_diode_handbook.pdf
  5. Y

    How to get the stability for the microwave lownoise amplifier

    hi please attach you schematic and then it is better situation to discuss.It seems that drain resistance is too high to reach that value of noise figure.and of course the feedback resistor(drain to source) is connected for gain flatness usually.If the gain is flat enough you can omit that value...
  6. Y

    noise analysis in microwave office

    actually I have connected different noise sources and set up different measurments, But I coulden't establish the proper result.would you please tell me about the source and measurment setup more precise
  7. Y

    Txline between non-50ohm antenna and receiver.

    of course this is some kind of matching itself.but appropriate for real impedance to real one transformation and if the impedance is not real it does not work.I agree with vfone
  8. Y

    noise analysis in microwave office

    hi again yes.but what kind of noise source have to be choose?
  9. Y

    Txline between non-50ohm antenna and receiver.

    hi the impedance of the line should be the same as antenna before matching circuit This is simple or I'm making some mistake?
  10. Y

    noise analysis in microwave office

    hi thanks for your reply I was aware of what you said.But if I want to simulate anyway, how can I do that? Imagine I'm going to simulate some device (including passive or active devices),how can I introduce noise sources in microwave office?
  11. Y

    noise analysis in microwave office

    hi all I'm going to analyze SNR in wilkinson power divider.I meant i want to introduce some signal with certain value of noise in one port of wilkinson power divider and see the effect of power divider on SNR in other ports in AWR microwave office.would you please guide me simulate it in that...
  12. Y

    effect of noise figure on phase noise

    hi all this formula is correct for offset frequencies that is far enough from the carrier.but for 1/f noise i dont think it is true please see this file from wenzel and this approve me https://www.wenzel.com/documents/hints.htm I agree with you for offset frequencies that far enough from...
  13. Y

    How to arrange the DC layer in layout ?

    your question is not clear.please tell more about that
  14. Y

    help diagnose problem with phased array antenna

    hi In my idea check the signal path using HF probe and spectrum analyzer if you have anyone available to make sure that the components work properly.this is the first step.If components work properly then check the control data and check the wiring one more time to make sure that they are...
  15. Y

    effect of noise figure on phase noise

    hi again thanks for your reply There is no problem with DDS. the main question is:Imagine that there is a signal with phase noise for example -120dBc/HZ.The signal goes through some microwave part for example switch with noise figure=4 dB.then what is the phase noise of output signal???
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