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Type: Posts; User: volker@muehlhaus

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  1. [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

    No, Brad ist correct: the magnitude of R and X are equal in his left testcase, and current is equal, so indeed there is 0.7V across each of the components. But these voltages have a 90° phase offset,...
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    Closed: Re: very uneven power divider

    What is the coupling ratio? Maybe it's easier to just use a resistive divider in parallel to the main line, if the coupling is that small. The resulting mismatch is small then.
  3. [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

    Here is the mistake in interpretation of your voltage divider experiment:

    You expect the output voltage to be half the total voltage, because R and X are equal.

    But that's wrong. The voltage...
  4. [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

    Are you new to the concept of complex impedance? In the original post, there is a proper specification of complex impedance (real part from 50 Ohm termination, imaginary part from capacitor) so I'm a...
  5. [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

    No. Impedance is capacitor voltage divided by capacitor current, and then we get 77 Ohm from your experiment.

    156091
  6. [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

    chiques, my comment was for BradtheRad and his comment. He missed that you specified the proper complex value.
  7. [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

    Why do you confuse people if you don't understand the Smith Chart, and how to read it?
    The original question was clear: 50.04 -j77.16
  8. [SOLVED]Closed: Re: Calculate Capacitance Value from Smith Chart

    https://www.allaboutcircuits.com/tools/capacitor-impedance-calculator/
  9. Closed: Re: Microstrip to layout in ADS for power amplifier design

    You're discussing the wrong workflow. He uses a complete device, and doesn't design his own chip.

    - - - Updated - - -



    Look up the footprint size in datasheet and arrange input & output...
  10. Closed: Re: Microstrip to layout in ADS for power amplifier design

    It seems he relies on auto-generated layout (from schematic) and doesn't know how to place components or artwork in layout manually. So in that case, having the component footprint will help in...
  11. Closed: Re: Simple dipole compared to a folded dipole in a 2.4 GHz Wifi Yagi Antenna

    The difficulty is that you need not only a directional coupler and detector, but also a signal source with constant carrier.

    For testing VSWR of my 2.4GHz antenna designs, I use this instrument...
  12. Closed: Re: Microstrip to layout in ADS for power amplifier design

    No, sorry. But it' not complicated, you can draw using the drawing function icons (polygon etc).
  13. Closed: Re: Microstrip to layout in ADS for power amplifier design

    For many components, you also find complete libraries (designkits) with components predefined, which have electrical model and layout.

    If you want to create that yourself, create a cell for each...
  14. Closed: Re: Microstrip to layout in ADS for power amplifier design

    But for auto-generating the layout, the MGAP is indeed a possible placeholder for the SMD. It can be set to create a defined gap, so that auto-generated layout continues with the next elements...
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    Closed: Re: Two patch antennas gain

    Just calculate the resulting pattern from two simulataneous radiators at some offset. There is interference depending on direction, and different for different offsets. You will see the resulting...
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    Closed: Re: Two patch antennas gain

    Yes, because the combined pattern will create side lobes as distance increases.

    I created a little testcase for you:
    - 2.4 GHz patch antennas with 40mm edge length
    - Spacing varied from 20mm to...
  17. Closed: Re: Microstrip line and ground on same layer

    Why have you chosen substrate thickness in your example as 3mils? That's somewhat unusual. Likewise, 2mils gap is rather extreme.

    With "normal" dimensions, the effect caused by side ground that I...
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    Closed: Re: RFID Coil design and Simulation

    What I have seen for UHF RFID readers are patch antennas.

    EM simulation is possible and useful, planar simulation with ADS Momentum is a good starting point.
    A former collegue designed this...
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    Closed: Re: RFID Coil design and Simulation

    What RFID frequency band? UHF?
  20. Closed: Re: Microstrip line and ground on same layer

    In addition to what was posted above, you can check side ground distance here:
    https://chemandy.com/calculators/coplanar-waveguide-with-ground-calculator.htm
    ...
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    Closed: Re: ADS Filter simulator

    Please read my post again, and try what I suggested.



    Yes, that was the antenna pattern where your tutorial used the old ADS2011, but now ADS has a completely new 3D viewer. Don't take...
  22. Closed: Re: Simple dipole compared to a folded dipole in a 2.4 GHz Wifi Yagi Antenna

    I recently purchased some antennas from a design house who document some precision requirements. They say that dipole dimensions are very critical, and they have 0.02mm (!!!) repeatability for their...
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    Closed: Re: ADS Filter simulator

    I tried to reproduce in ADS2020.

    I entered Fp1 and Fp2 first, then Fs1 and Fs2. This results in filter order 5, not 10 as shown in your case. Works fine, no problems.

    Your order jumped from 2...
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    Closed: Re: Question about RF power meter

    Maybe you start width designing an antenna for that bandwidth, then share your findings ;-)
  25. Closed: Re: Question about PC3.5mm and SMA connectors

    http://na.support.keysight.com/pna/connectorcare/What_mates_with_what.htm
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