Getting Started with HFSS: A Complete Cavity Resonator Example

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Getting Started with HFSS: A Complete Cavity Resonator Example

Рет қаралды 11,803

Stephen Remillard

Күн бұрын

Пікірлер: 20

@sudharsansrinivasan5703 2 жыл бұрын

For the 3 dB lower marker, you can use the Y axis marker and scroll it down. In the property manager, you can also lock the marker line, and it automatically tells the f2 and f1 for the 3 dB drop.

@stephenremillard1 2 жыл бұрын

Thank you Sudharsan Srinivasan for answering this question. Awesome! That takes out a tedious step.

@geevnahal7926 2 жыл бұрын

Dear Dr. Remillard, First of all, I am grateful that you took the time of making these videos and posting them. I am a physics graduate student, and I cannot emphasize enough the values of these videos on my current research. For me, with not having a background in electronic engineering, this is the condensed knowledge I desperately needed. I would be thankful if you post a video about the theoretical calculation of the unloaded Q. I am currently studying a tunable cavity based on this coax resonator, which I will email you more details about it. Thank you again for your generosity, Geev

@stephenremillard1 2 жыл бұрын

Thank you Geev for asking about this. Yes, I will make a video on the electromagnetic theory of Q (e.g. geometry factors and such) soon when I get a little time. In case it is also useful to you, here are some links to experimental Q measurement videos: Theory: kzfaq.info/get/bejne/iq2SrbyC0baqfWg.html Demo with a VNA: kzfaq.info/get/bejne/qMhmot1ktc-Yl3U.html Demo with only one port: kzfaq.info/get/bejne/a6qXoKtqvdnKfHU.html But, I guess you might have already noticed those. Thank you for the request. Regards

@stephenremillard1 2 жыл бұрын

Done: kzfaq.info/get/bejne/hNl7fZeK2-DRgmQ.html

@geevnahal7926 2 жыл бұрын

@@stephenremillard1 many thanks,

@geevnahal7926 2 жыл бұрын

Dear Dr. Remillard, Would that be possible to explain/show how one can measure the filling factor of a small region inside the cavity in hfss? Many thanks,

@stephenremillard1 2 жыл бұрын

@@geevnahal7926 I suggest using Slater's theorem. First simulate without the dielectric present to get frequency fo. Then simulate again with the dielectric present and get frequency f. The frequency shift reveals the filling factor (ff). f^2=(fo^2)(1-ff) See Equation 10 in www.jpier.org/PIERB/pierb15/09.09041706.pdf. Be aware that this is perturbative. If the dielectric is a large part of the space, then this is not valid. But in that case, the concept of filling factor isn't so useful anyway.

@tiagonfig Жыл бұрын

Fantastic video!

@LILI-cb4ez 2 жыл бұрын

Dear Dr.Remillard I am so grateful that you took the time of making these videos and posting them.I am a student who use the HFSS ,too. I am doing a cylindrical cavity simulation with HFSS, and its S11 is too low, just abot -0.1dB. Is it wrong for a simulation? The cavity is based on 2.45GHz, and I use probe to loop it. its diameter is 93mm and baout 80mm high.

@stephenremillard1 2 жыл бұрын

Sorry I just saw this. Yes, you can do simulation at any value of S11 - even weaker than -0.1 dB. One advantage of resonator simulation is that you can inspect the resonance peak even when it is so weakly coupled that a network analyzer trace would be too noisy.

@maryamrahmani8806 2 жыл бұрын

Thank you so much for the great video! Would you mind making a video on the analytical calculation of the Q_u and the field intensities inside the resonator? I appreciate it!

@stephenremillard1 2 жыл бұрын

Yes, certainly. Here it is: kzfaq.info/get/bejne/hNl7fZeK2-DRgmQ.html

@user-rt9pw2jk8r 10 ай бұрын

Amazing video. Can you please spare some time and make more HFSS simulation videos? Combining simulation results with analytical formulas is one of the very rare things and I have not seen it anywhere in the KZfaq video. Please benefit us from your knowledge.

@yaobing-qw4rj 5 ай бұрын

Filter design and debugging (LC cavity microstrip waveguide bandpass, low-pass, high pass) duplexer design 10 years of experience in HFSS simulation design and engineering, with a design frequency of terahertz. All designs are based on practice and guided by theory. Remote after-sales service is available, and long-term cooperation can provide on-site service!