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Type: Posts; User: volker@muehlhaus

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  1. Replies
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    Closed: Re: 750 MHz Band Attenuation Filter

    Actually, I like to combine both discrete and line elements at these frequencies. But as FvM mentioned, without full specs it's not possible to estimate anything.
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    Closed: Re: ADS Simulation of Circuit -Help

    Show what you have done so far and what your results are.
  3. Closed: Re: Question about phase noise simulation using cadence and ADS EM simulation.

    Misunderstanding maybe? I know users who like to put a lot of layout into their EM models, not just individual inductors, which makes the model a multiport with many ports. But I have no idea how...
  4. Closed: Re: How to make a coil to be resonance?

    To achieve what?
  5. Closed: Re: Wireless rectenna on flexible board

    As FvM mentioned, the ground situation near the "hot" end of the antenna (largest E field) is completely different. In the flex design, you have broken that solid ground plane.

    156765

    The...
  6. Closed: Re: Wireless rectenna on flexible board

    These chip antennas are extremely sensitive to the exact PCB environment, including ground plane size.
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    [SOLVED]Closed: Re: ADS schematic to layout

    Yes



    Yes, that is the RF engineer's use of ADS, to include these elements in simulation (!) to see their effect on simulation results (!) and then create that (!) layout.
  8. Closed: Re: Simple 50R I/O RF attenuator (1-30MHz)

    Yes, sorry, I misunderstood the initial question and didn't realize that it is a series resistor in between two fixed 10dB attenuators. I understood it's about implementation of those 10dB...
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    [SOLVED]Closed: Re: ADS schematic to layout

    This has been asked by other students working on the same topic many times before: It is not possible because you have zero layout information in your design.

    If you want to do the layout in ADS,...
  10. Closed: Re: Simple 50R I/O RF attenuator (1-30MHz)

    I agree with FvM. For these small attenuation values, there is a lot of variation in shunt resistance required, to keep the 50 Ohm input/output impedance.

    If you look at voltage variable...
  11. Closed: Re: 60dB attenuator prior to spectrum analyzer, how to?

    Yes. If you start calculating PI attentuators with low value, you will notice a small series resistance and large shunt resistors. With increasing attenuation, the series resistance increases, and...
  12. Closed: Re: 60dB attenuator prior to spectrum analyzer, how to?

    The attenuator is calculated to have 50 Ohm at input and output, if the other side is terminated with 50 Ohm.
    Just use this calculator:...
  13. [SOLVED]Closed: Re: Impedance of Z(1,1) is not 50 ohm in HFSS

    Looks much better, and imag{Z} scales with frequency as expected. I think you've solved your issue now.
  14. Closed: Re: Keysight ADS ground connection in schematic not reflected in layout

    There are no magic settings to eliminate that.

    Note the message says "The distance between the layout pins for port 1 is electrically large above xxx GHz, S-parameters may become unphysical."...
  15. Closed: Re: Keysight ADS ground connection in schematic not reflected in layout

    The 2D sheet is what 2D implies, a sheet instead of a volume. In EM simulators we can have infinitely thin sheets with thickness for resistance determined from skin depth or user input. But for this...
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    [SOLVED]Closed: Re: [HFSS] MagE and CmplxE

    Phase varies with time and location
  17. [SOLVED]Closed: Re: Impedance of Z(1,1) is not 50 ohm in HFSS

    Looking at your screenshot, I suspect that you have a metal object in parallel to your lumped port.

    I'm not an HFSS user, but in all my EM tools a lumped port is between the metals, and looks like...
  18. [SOLVED]Closed: Appnote: The emModel view in ADS Momentum

    For many years, I have seen support questions and forums posts where new Momentum users made mistakes related to the emModel view.

    If you use Momentum and don’t know what the emModel view is, this...
  19. Closed: Re: Mains harmonic emissions for dimmable offline LED drivers.

    Have you read my link above?

    Section 4.3 EMC Assessment
    4.3.1 General Concept

    The EMC assessment needs to take into account all normal intended operating conditions of the apparatus. In cases...
  20. Closed: Re: Keysight ADS ground connection in schematic not reflected in layout

    I cannot recommend to do that, because you EM simulate something that you can't build. The MLSC mode automatically creates a "2D sheet" via at the end of the MLSC. If that connection is missing in...
  21. Closed: Re: Mains harmonic emissions for dimmable offline LED drivers.

    treez, please let me know what company you work for, so that I can stay away from products that you designed. You always try to interpret specs and regulations to your liking.
  22. Closed: Re: PCB and schematic simulation for CE with CST

    Yes, that creates a connection from the ports plus terminal to the ports local reference.



    If your port represents a series element, then both is wrong. You need to probe voltage against the...
  23. Closed: Re: Mains harmonic emissions for dimmable offline LED drivers.

    I looked at LED driver EMC regulations a while ago. From what I remember, you need to test the worst case that is likely in real operation.

    https://ec.europa.eu/docsroom/documents/33601
  24. [SOLVED]Closed: Re: Assigning boundary and Lumped port to 3D spiral coils in HFSS

    Let me add: a port has + and - terminal. You have one TX port and one RX port.
  25. [SOLVED]Closed: Re: Assigning port and boundaries to 3D spiral coil in HFSS

    As I wrote: one lumped port for each coil, between the two ends of the wire, so that current can flow from the port through the coil.
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