QUESTION:
Do you have a high frequency electromagnetics transmission line example comparing results obtained using the release 9.0 port definition procedure (HFPORT,,TLINE) with those using the new (at release 10.0) modal port procedure (HFPORT,,MODAL)?
ANSWER:
Input files for a model of a planar, wide, band log-periodic balun are attached to this solution along with the IEEE paper upon which the model was based. The paper presents device performance over a range of frequencies. Due to time constraints, the input files only solve at a single frequency (3GHz). Presented results from the paper in Figures 6a and 6b show that the magnitude balance and phase difference at the two output ports at 3GHz should be ~0 and ~-180 degrees, respectively. Results from the 2 supplied input files are in agreement with these results.
Further discussion:
1) tline_ports.inp: at release 9.0 and earlier, transmission line ports were defined in the manner that they are in this file. Voltage paths had to be defined in the plane of the port if s parameters are to be extracted. BFE,,JS excitation was defined some distance from the feed port. Feed ports and ports across which radiation left the computational domain needed to be 'backed' by PML ('perfectly matched layers') to absorb outgoing radiation with minimal reflection.
2) modal_ports.inp: This model uses the new modal port feature new at release 10. This procedure is MUCH simpler to use than the old TLINE port procedure. Be warned that at release 10, the macro used to calculate field distribution at modal ports (HFMODPRT.MAC) did not always work for numerically small dimensions in MKS units (sub-millimeter and smaller). A new version that works much better has been developed for release 11 and is attached to this email. Before running this model at release 10, you must replace the old HFMODPRT.MAC macro file (C:Program FilesAnsys Incv100ANSYSapdlHFMODPRT.MAC) with the one attached to this email. N
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QUESTION: Do you have a high frequency electromagnetics transmission line example comparing results obtained using the release 9.0 port definition procedure (HFPORT,,TLINE) with those using the new (at release 10.0) modal port procedure (HFPORT,,MODAL)? ANSWER: Input files for a model of a planar, wide, band log-periodic balun are attached to this solution along with the IEEE paper upon which the model was based. The paper presents device performance over a range of frequencies. Due to time constraints, the input files only solve at a single frequency (3GHz). Presented results from the paper in Figures 6a and 6b show that the magnitude balance and phase difference at the two output ports at 3GHz should be ~0 and ~-180 degrees, respectively. Results from the 2 supplied input files are in agreement with these results. Further discussion: 1) tline_ports.inp: at release 9.0 and earlier, transmission line ports were defined in the manner that they are in this file. Voltage paths had to be defined in the plane of the port if s parameters are to be extracted. BFE,,JS excitation was defined some distance from the feed port. Feed ports and ports across which radiation left the computational domain needed to be `backed` by PML (`perfectly matched layers`) to absorb outgoing radiation with minimal reflection. 2) modal_ports.inp: This model uses the new modal port feature new at release 10. This procedure is MUCH simpler to use than the old TLINE port procedure. Be warned that at release 10, the macro used to calculate field distribution at modal ports (HFMODPRT.MAC) did not always work for numerically small dimensions in MKS units (sub-millimeter and smaller). A new version that works much better has been developed for release 11 and is attached to this email. Before running this model at release 10, you must replace the old HFMODPRT.MAC macro file (C:Program FilesAnsys Incv100ANSYSapdlHFMODPRT.MAC) with the one attached to this email. Note that the new modal port feature is not accessible through the traditional ANSYS GUI so when working interactively it must be typed on the command line. The feature is documented (HFPORT command), so that you may figure out how to enter it on the command line. |
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