two parallel planes as capacitor, just create a lumped source at the location you want to excite this capacitor. I can not figure out what is the meaning of "directly set the wave port on the surface of the two planes".xbtxbt said:Thank you very much.
You are so kind.
I think I need more knowledge about EM field.
Now I have to simulate a pallrall plane capacitance of two layers by HFSS to see the S-parameter.On each plane,I want to set a port.If I directly set the wave port on the surface of the two plane,Simulation process ended for material assign fault.When I set an air cube on the top layer of the capacitance,Simulation can proceed well but with a faulty result.I'm really confused how to deal it.
two parallel planes as capacitor, just create a lumped source at the location you want to excite this capacitor. I can not figure out what is the meaning of "directly set the wave port on the surface of the two planes".
Anyway, this structure is quite challange in HFSS, because of high Q factor, memory and time consuming.
About material assign fault, please check whether u properly setup all materials, metal Plane (pec or lossy metal), substrate (between planes), outer boundary (radiation boundary or PML). I suspect your port setting overlap with the outer radiation bounday, so you got such error prompted out.
Best Regards,
I think you misunderstood the definition of wave port, you can get all the information about the port settting from the HFSS manual and related materials which you can download from this forum.xbtxbt said:Formerly. I select the surface of the upper plane of the capacitance with nothing on which at that time. then I use command: assign excitation> wave port.!!
asdfaaa said:I think you misunderstood the definition of wave port, you can get all the information about the port settting from the HFSS manual and related materials which you can download from this forum.xbtxbt said:Formerly. I select the surface of the upper plane of the capacitance with nothing on which at that time. then I use command: assign excitation> wave port.!!
Some hints: put a small piece of metal connecting two planes at the location where you excite this capacitor (BUT the width of this rectangular metal should be very small, the smaller the better, otherwise it interference the field distribution of two planes), then assign this metal into lumped source, then u can proceed ur simulation.
Best Regards.
asdfaaa said:post ur hfss project file, I check for u~
Best Regards.
asdfaaa said:HI, this structure is so messy for me. :-( I tried to modified the file, since there are lots of errors in your model.
substrate overlap with metal via, the air gap between two layers of substrate(I dont know whether it is your design purpose). And also please use Boonlay different parts of metal (as my understanding it is a spiral inductor).
I added one wave port for you as the CPW feed(exactly it is not CPW, the width of two side groud plane is too small, and I dont know what is your exact excitation). About another port, I dont know the design purpose, is it a microstrip fix or something else, If it is a port, your only choice is the lumped port, you can not use the waveport. More details pls refer the HFSS port tutorial material.
Pls feel free to discuss. Best Regards.
asdfaaa said:my comments for your design:
1. impedance of the cpw feed, 50 Ohms? your design is quite far from 50Ohms
2. ur feeding is cpw feed or microstrip feed?
3. the rectangular plate inside the spiral inductor, any specific design? another capacitor? It is different with usual spiral inductor design.
I attach another PDF file came from AnSoft 2004 worldwild workshop, it is about spiral inductor design. wish it helps u.
anyway, I added another capacitor in your design for easy setting up the second waveport, I get the resonance, you can check it.
Best Regards,
asdfaaa said:my pleasure. Now the model is ok?
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