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ZMT zurich med tech

Impedance plotting

Scheduled Pinned Locked Moved Analysis & Postprocessing
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  • M Offline
    M Offline
    Michael 0
    wrote on last edited by
    #1

    Hello,

    I'm working on a multiport simulation of a birdcage coil. I've done a few simulations already, but there's something I don't understand. I am using a high pass birdcage coil with two endring sources. I created a 2D impedance plot (Impedance Zij(f)) by clicking on Network Analysis – S Converter – Impedance Zij and then tried to create this plot by clicking on one of the sources by selecting Port Simulation Extractor-Sensor Extractor-EM Input Impedance(f). I thought that these two plots should look the same, but they don't, so I would like to ask for some clarification… Why are these two plots different? Am I missing something or is it some problem within my simulation?
    Thanks in advance.
    Network_analyses.PNG
    Port_simulation_extractor.PNG

    ofliO 1 Reply Last reply
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  • ofliO Offline
    ofliO Offline
    ofli ZMT
    replied to Michael 0 on last edited by
    #2

    Dear @Michael-0

    Please refer to books like Microwave Engineering by Pozar. The impedance matrix is defined as shown in the attached figure (from Pozar) and Z_ii is the input impedance seen looking into port i when all other ports are open-circuited.

    inpedancematrix.png

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