We’re putting the final touches on our new badges platform. Badge issuance remains temporarily paused, but all completions are being recorded and will be fulfilled once the platform is live. Thank you for your patience.
PCB Design

PCB Design

In HFSS 3D, the default port impedance is 50 ohms. However, the user may want set the port impedance to a complex number like R-jX ohms to account for matching circuits. At times, if reactance is set in the port settings, it may trigger positive S parameters. In this document we explore how correctly set the port to a non 50-ohm termination and obtain the correct S parameters.

    • SolutionSolution
      Participant

      To model R-jX ohms for port impedance, the recommended method to modeling complex port impedance is to 1.Divide the port into 3 rectangles; two rectangles for the capacitors and one for the port itself. We use two capacitors instead of one for a balanced feed as shown in the attached PDF. 2.The port and two capacitors are in series. 3.Calculate the capacitance C= 1/(2*pi*f*X) and where X is the imaginary part of the required port impedance. C1 = C2 = 2C 4.The port should be set to the real part of the required port impedance (R) and be normalized to 50 ohms (network analyzer).

      Attachments:
      1. How%20to%20Set-up%20a%20non%2050%20Ohm%20Port.pdf