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Type: Posts; User: volker@muehlhaus

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  1. Closed: Re: HAM radio topic: EM based design of a 432 MHz high pass with 144 MHz rejection

    Any news on your experiment?
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    Closed: Re: ADS model Doide s-param

    No you misunderstand things. Just look at the datasheet and you will understand why 40V is low insertion loss and 50mA is high insertion loss (=shorted to ground)

    157842
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    Closed: Re: ADS model Doide s-param

    I see the same thing with your data. Maybe they measured in SHUNT configuration?

    Edit: If you look at the datasheet, it shows the diode in shunt configuration to ground indeed. It is not in series...
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    Closed: Re: Pulsed microwave beam conundrum

    You might try this: https://en.wikipedia.org/wiki/Tin_foil_hat

    Or get a serious meter that doesn't indicate nonsense values.
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    Closed: Re: Plot field of microstrip

    What value have you plotted? This looks like current density in an OPEN ended line.
  6. Closed: Re: What is the latest RF HEMT for prototype LNA?

    Maybe this is for you:
    https://www.minicircuits.com/pdfs/SAV-541+.pdf
  7. Closed: Re: The truth about coaxial cables at high frequencies

    You misunderstand the concept of RF lines. The L' and C' are distributed across the length, which behaves completety different from a simple low pass of 1µH and 100pF. The line that you describe has...
  8. Closed: Re: How to choose optimal wire width of spiral coil to attain high q factor?

    This shows that your evaluation of Q is not what others discuss.
  9. Closed: Re: Methods of decreasing the coupling between two closely placed antennas

    If it is near field, I would think about 90° rotation to reduce E and H near field coupling.
  10. Closed: Re: HAM radio topic: EM based design of a 432 MHz high pass with 144 MHz rejection

    Sure, the entire ADS workspace is attached.157472

    - - - Updated - - -



    Hi Peter,

    what length do you mean with 43mm? If you follow the link in my post, I have given the dimensions that I...
  11. Closed: HAM radio topic: EM based design of a 432 MHz high pass with 144 MHz rejection

    Hello,

    there are some HAM radio operators around here, so maybe this is of interest.

    In our multi operator VHF/UHF contest location, we had an issue with the 144 MHz fundamental (!) signal...
  12. Closed: Re: Using ADS2019, How to set and measure tempature values for LNA?

    I like the Modelithics libraries (license requires)
    Some manufacturer also have good passive libraries, for example I often use Murata ADS libraries.
  13. Closed: Re: Using ADS2019, How to set and measure tempature values for LNA?

    Yes, nonlinear model sounds correct. And use a variable for temperatur, so that you can change it easily for all components.

    For the ideal L and C elements in your design temperature will not...
  14. Closed: Re: Using ADS2019, How to set and measure tempature values for LNA?

    The most important component in your model - the transistor - is an S2P dataset at one fixed temperature. Your plan makes no sense if you only have that transistor data at that fixed temperature.
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    Closed: Re: problem with ADS license

    The only solution is to have an ADS license that includes Cadence Interoperability. You need to contact Keysight.
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    Closed: Re: problem with ADS license

    There are some designkits built to support Cadence Interoperatibility (for example IHP) and indeed that requires an extra license feature. PDKs without interoperability don't need that license...
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    [SOLVED]Closed: Re: Momentum cosimulation ADS

    Sure, that is possible.

    But make sure the difference is not from using too simple model (e.g. lossless metal or lossless dielectric) in Momentum simulation.
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    [SOLVED]Closed: Re: Momentum cosimulation ADS

    What is "better" ? They can be different, in any direction.
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    Closed: Re: How to design a DC block circuit

    As Klaus mentioned, just use a 100pF series capacitor.
  20. Closed: Re: Characteristic impedance of combination of CPWG and stripline on inner layers

    Yes exactly. By leaving out those vias, your various "ground" metals are unconnected and can be start to have unwanted potential here and there ... causing all sorts of resonance and strange...
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    Closed: Re: ADS co-simulation taking too long

    The taper width is reversed in your model:
    left is cell4 with w=5.2
    right is cell5 with w=10.5

    I looked at internal losses your matching circuit. To do so, I put them back to back and calculate...
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    Closed: Re: ADS co-simulation taking too long

    It can be physical if the taper is lossy. One way to check that is to look at |S11|2 + |S21|2 of the tapers. Result is between 1 (for lossless device) and 0 (completely lossy)

    Can you tell me a...
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    Closed: Re: ADS co-simulation taking too long

    The S2P file is missing.

    I don't think that random optimization with 4 variables is efficient for EM-based simulations. Have you tried to find a mathcing solution using circuit model taper first,...
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    Closed: Re: ADS co-simulation taking too long

    Ok, the cells scale properly.

    Similation method: Your random optimization approach looks inefficient to me.
    I didn't try the actual simulation because I don't have that demokit installed...
  25. Closed: Re: Light distribution from multi LED lamp?

    The difficulty with using 10 small COB to illuminate 10 different areas is this: depending on color tolerance of the individual COB, you will notice different color on your wall/target. Color...
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