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[How to calculate quality factor] Cylindrical Dielectric Resonator
Posted 22 avr. 2014, 10:40 UTC−4 RF & Microwave Engineering Version 4.4 0 Replies
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Hi! I am a new one to use COMSOL, currently I want to simulate a simple case - cylindrical dielectric resonator (Reference: Microwave Engineering, 4th ed. David Pozar, Chap 6 Ex 6.5) : I want find the resonant frequency and approximate Q for TE10x mode. The parameter of the resonator : relative permittivity = 95, and loss tangent = 0.001, where the radius of the cylinder resonator = 0.413cm, and the length if the resonator = 0.8255 cm.
I try to use a spherical PML surrounding all the resonator, then simolate it. The result of resonant frequency = 3.34GHz, very close to the answer (3.4GHz), but the quality factor is 608, smaller than the answer (~1000). And the E field seems penetrates to deep PML layer.
I think that maybe something wrong when I create this model or there's another method to calculate the quality factor. So, could anyone kindly help me to solve this problem? (It's very important to me because it confused me about two weeks)
The following page is my comsol file: (too large to upload) please feel free to download it
drive.google.com/file/d/0B2i3aoYlzVuXZW1xSkdFaDM5Wkk/edit?usp=sharing
Thank you for you help!!
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C.H.Hsieh
Hello Cheng-Hung Hsieh
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