[HELP!] A Basic Question About PHASE SHIFT Measurement in HFSS
时间：04-05
整理：3721RD
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Here are the links to my model and my plot:
../imgqa/eboard/Antenna/rf-a0clylvxz1a.jpg
../imgqa/eboard/Antenna/rf-zu321cjkdgm.jpg
Hey guys, I'm totally new to HFSS and now working on a simple coupling microstrip circuit.
The model is quite simple. As the images shown, I want power fed at Port1 of a long microstrip to be coupled to a U-shape resonator and have a 180-degree phase difference between Port3 and Port4. Therefore I make the TOTAL length L of the U-shape resonator half of the wavelength, which is about 200 microns at my working frequency (250 GHz).
But what confuses me is that, no matter how long L (total length of the resonator) is, I always have a 180-degree phase shift between Port3 and Port4!
In the attached plot, I make L 1/4 wavelength long. If I plot cang_deg(S(3,4)), or cang_deg(St(3,4)) in my case, I get just 90 degrees between Port3 and Port4. However, what makes sense is cang_deg(S(3,1))-cang_deg(S(4,1)), right? That way, I still have a 180-degree phase shift!
Can anyone help me fix this problem? I really appreciate it!
../imgqa/eboard/Antenna/rf-a0clylvxz1a.jpg
../imgqa/eboard/Antenna/rf-zu321cjkdgm.jpg
Hey guys, I'm totally new to HFSS and now working on a simple coupling microstrip circuit.
The model is quite simple. As the images shown, I want power fed at Port1 of a long microstrip to be coupled to a U-shape resonator and have a 180-degree phase difference between Port3 and Port4. Therefore I make the TOTAL length L of the U-shape resonator half of the wavelength, which is about 200 microns at my working frequency (250 GHz).
But what confuses me is that, no matter how long L (total length of the resonator) is, I always have a 180-degree phase shift between Port3 and Port4!
In the attached plot, I make L 1/4 wavelength long. If I plot cang_deg(S(3,4)), or cang_deg(St(3,4)) in my case, I get just 90 degrees between Port3 and Port4. However, what makes sense is cang_deg(S(3,1))-cang_deg(S(4,1)), right? That way, I still have a 180-degree phase shift!
Can anyone help me fix this problem? I really appreciate it!