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Type: Posts; User: volker@muehlhaus

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  1. Closed: Re: Need help on ADS inductor simulation

    Is the layout correct? Is there a connection between primary and secondary, possibly because of wrong layer assigments?
  2. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    No, that is a good and valid design approach. It also allows to test your device with 50 Ohm test equipment, independent of the load + matching network.
  3. [SOLVED]Closed: Re: Why is there always a shunt inductor for SMD (Surface Mount Device) antenna?

    That was my explanation in #2. But they have a shunt L, not a series L. We don't know what the internal design looks like, so I have no idea what they use this shunt L for. There is a tap with some...
  4. Closed: Re: (ADS) There are no components in ADS after importing my PCB layout from Altium

    I don't understand why Gerber would be a solution. For sure, there will be no components in Gerber import. Gerber is nothing but polygons. ODB++ has more information that the simple Gerber format.
    ...
  5. [SOLVED]Closed: Re: Why is there always a shunt inductor for SMD (Surface Mount Device) antenna?

    That's unusual for the electrically small antennas that I know (or have designed myself). Can you link to the antenna datasheet?
  6. [SOLVED]Closed: Re: Why is there always a shunt inductor for SMD (Surface Mount Device) antenna?

    Not in the place where you have drawn it.
    There is often a series inductor, to "extend" an antenna that is physically too short. Often combined with a shunt C.

    Here's an article from 1953 on...
  7. Closed: Re: Some questions about low side RF routing and interconnection

    To avoid misunderdstanding:
    don't use a top side ground that is connected ONLY to ground far away from the RF signal path.
  8. Closed: Re: Some questions about low side RF routing and interconnection

    I usually use 2.7mm line width. If you can't keep the line width over the entire length, use it where possible. That is better than using a constant narrow trace width.



    The line impedance...
  9. Closed: Re: Cable simulator with lumped components

    For these specs, doing it with the actual real cable is by far the cheapest solution.
  10. Closed: Re: microstrip low pass filter design issues with sonnet

    Here it is, with 1.27mm thickness at er=10.8 we get 115 degree

    155360

    but that assumes a thru line. Due to the parasitics of an open ended line and the narrow feed from the side, we actually...
  11. Closed: Re: Parameters S12 Reverse transmission coefficient

    Maybe he talks about dual polarization antenna. Circular polarisation created by a power splitter with 90° phase delay.
  12. Closed: Re: microstrip low pass filter design issues with sonnet

    Correct, my statement refers to lambda/4 effective wavelength (90° S21 phase) for the actual substrate.

    Edit: Doing the math with the limited information that you supplied the S21 phase that I get...
  13. Closed: Re: Is there possibility to force a filter topology in DA_LClowpassMatch in ADS?

    I don't know a way to enforce pi structure in ADS filter synthesis.
    In Nuhertz you can select the number of elements, so you can enforce pi filter even if 2 element L structure is sufficient for...
  14. Closed: Re: How can I simulate tapping point in ADS?

    True, but unrelated to the question. You have 4 posts in this thread, but zero content useful to ksj1453
  15. Closed: Re: How can I simulate tapping point in ADS?

    The filenames are still there, but they are not relevant to ADS users. Users select "Simulation" in the ADS schematic menu.

    155338
  16. Closed: Re: How can I simulate tapping point in ADS?

    The term ADSsim has been replaced in ADS documentation since ADS 2017.
    The correct terminology used in ADS documentation is "Analog/RF simulation".

    Cheers,
    Volker
    (Keysight Certified Expert...
  17. Closed: Re: How can I simulate tapping point in ADS?

    I guess he means MLIN and searches for MTEE, but the question is unclear indeed.



    Use correct terminology

    - - - Updated - - -
  18. Closed: Re: microstrip low pass filter design issues with sonnet

    Yes, using the equation that gives input impedance as a function of line impedance, line length and load impedance.
    This is not specific to microstrip lines.

    Page 3, chapter "Impedance...
  19. Closed: Re: microstrip low pass filter design issues with sonnet

    You implement that shunt C by a transmission line, and have some freedom in choosing a width and then calculating the required length. It seems that the "open circuited stub" layout used a length of...
  20. Closed: Re: How can I simulate tapping point in ADS?

    What are you talking about? Show a screenshot, please.
  21. Closed: Re: Recommendation needed for gain of antenna for a 2.4 GHz wifi extender

    Use a point to point wifi bridge with a truely directional antenna. The omnidirectional antennas are by design limited in gain, a directional antenna is more suited for the link between two buildings.
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    Closed: Re: Patch bowtie matching problem

    By adding the balun, you get a symmetric feed for symmetric radiation pattern.
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    Closed: Re: Patch bowtie matching problem

    In real world: yes. Otherwise your antenna will be sensitive to touching the coax feed.
  24. Closed: Re: microstrip low pass filter design issues with sonnet

    I'm sure you'll figure it out ... just look at imported layers one at a time.

    The DXF file created by Sonnet is 2D data, so don't expect different z position of signal and ground layer.

    ~~
    ...
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    Closed: Re: Patch bowtie matching problem

    Add a 1:1 balun where you go from unbalanced coax to balanced symmetric line.
    Also have a look at the alternative design in post #7
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