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How to measure EM port excitations from a subcircuit

Pablo Soto

Hi!

I've been working a few months with AWR and I am currently trying to make some simulations with Analyst on an Antenna design with an EM structure of 6 ports and a non-linear layout that is the excitation subcircuit for the 6 ports. The final structure is a combination of both structures:

However, the next step in the project is to measure the power signal in the 6 ports of the EM structure:

 

I would like to measure using probes the Power signal in the 6 ports of the EM structure in order to be able to change the Port Properties for the EM structure and set up the excitation for all 6 ports of a duplicate EM structure. Then, I could calculate and export the Antenna Radiation  Patterns with the Output File Menu's option AntPat_E, obtaining the radiation patterns of the EM structure excited by the subcircuit.

So, I would like to measure Power (dBm) in all 6 ports and its Phase (deg).

Thank you in advance,

Salud!

  • 0

    If I understand your question correctly, you should be able to measure the power (phase and angle) at any of those six ports of the EM subcircuit, either by moving (or duplicating) the M_PROBE you have there, or by selecting the nodes themselves (without needing the M_PROBE element).

    Note that to obtain nonlinear measurements such as the power at a node, you will need an excitation for that circuit that provides some kind of power level as an input.  The PORT elements that you have there now are strictly linear, and you will need to change one of them to an element such as PORT1 (Port with 1-Tone HB Source) in order to accomplish this.

    For a more complete list of port elements available in AWR, make your schematic the active window, then go to Draw > More Elements, and search the Name column for PORT.

    I hope this helps; if you are still having issues, we would encourage you (if you are able) to file a Support Case at support.cadence.com, where you would be able to submit your specific project for review and assistance.

  • 0 in reply to CurtisAWR

    First of all, thank you so much for your reply Curtis.

    However, I tried to do some of your advices but I don't get it or I didn't understood yor answer.

    I made a new schematic where I use now a Port with 1-Tone HB Source and I added another Probe.

    I did a new Graph and placed two new measurements: |Pcomp| in dBm and Ang(Pcomp)

    Both measurements are taken on Probe1, which is placed over EM's Port 3.

    Also, I duplicated this 2 measurements with probe 2, placed on Port 6 in order to compare the measurements.

    The results for Probe 1:

    And for probe 2:

    And even more, if I place a third Probe over EM's Port 1, I get also the same:

    So I need help, I am doing well or I missundertstood your reply?

    What I want is to know how to configure the EM ports to get the same excitation as in the non linear circuit:

    Thank you again.

    Best regards!

  • 0 in reply to Pablo Soto

    Hi Pablo,

    I can see the original picture of your schematic at the top of your message, but I'm unable to see the new pictures below it that you are trying to share.  Here is what I see on my side:

    Could you try to post your message again, using the same method you used to attach the original picture at the top of your message?

    Curtis

  • 0 in reply to CurtisAWR

    Hi Curtis,

    I'll try to post them in one reply quoting the previous text:

    Pablo Soto said:
    I did a new Graph and placed two new measurements: |Pcomp| in dBm and Ang(Pcomp)

    This is a screenshot of the measurement menu

    Pablo Soto said:
    The results for Probe 1:

    Pablo Soto said:
    And for probe 2:

    Pablo Soto said:
    And even more, if I place a third Probe over EM's Port 1, I get also the same:

    Pablo Soto said:
    What I want is to know how to configure the EM ports to get the same excitation as in the non linear circuit:

    This menu is from Edit --> Por Properties... (when 3D EM structure is displayed)

    I hope the images will be useful,

    Best regards and thank you!

  • +1 in reply to Pablo Soto

    Hi Pablo,

    Your Pcomp measurement has the Harmonic Index set to 0, which is going to give you the power at that probe at DC.  I think it's likely the case you would want to change that value to 1, so you can get the power in the first harmonic (which is the fundamental frequency at which you are exciting the circuit).

    For more information on that measurement, you can click the Meas. Help button at the bottom right of the Modify Measurement dialog you've shown.  It should open up the Help page for that measurement.

    Curtis

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