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HFSS circular patch resonator filter with perturbation

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zam_nmn

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Hellu,

Did anyone have experience in designing a circular patch resonator filter with slots using HFSS?
I did search everywhere but couldn't find any example with HFSS. I found many papers designing circular patch with slots, however no detail explaination on how to create the slots on the patch using HFSS.
PLEASE FIND THE EXAMPLE BELOW:

 

Hello PlanarMetamaterials,

I need to know how to model the circular slot as per attach photo in HFSS, I did try using substract (which is the circular patch substract perturbation), however my response doesn't change. I also want to know how is the exact way to calculate the radius of slot in mathematical way. I really need an example tutorial on slot/notch creating on a patch using hfss to understand better.
I have another doubt, may I know how can I calculate the width and length of the 50 ohm feeding line if I am using suspended stripline?
 

Hi zam_nmn,

If your response didn't change after subtracting, most likely your simulation is not properly converged. Have it do extra adaptive passes and see if anything changes. I'm afraid I can't help you with the math of this, but google is your friend - there is a good HFSS patch tutorial at EMTalk. There are many free transmission line calculators on the internet, again google helps here (or a good microwave textbook such as Pozar).

Good Luck
 

Hello PlanarMetamaterials,

Thanks for your thoughts. Yes I did found the way to find the dimensions of transmission line and right now I am struggling to get the best response.
I am also trying to figure out how to add 135degree perturbation(hole circle to make it dual mode) from feeding line using HFSS. I did try with my design, but nothing was changed even though I vary the radius of the perturbation. If you have example project of using slot/notch in the design, do you mind to share with me?

Thanks a bunch!!
 

Hi zam_nmn,

Unfortunately I don't have a design for you. I would still maintain that if nothing changes, the simulation is not adequately converged. What is your convergence criteria?
 

Hello PlanarMetamaterials,

I am sorry but I need to ask what do you mean by convergence criteria?
by the way, here is my attached response with too many spikes filter.jpgs11.jpgs21.jpg, do you have any idea how to improve the response? my operating frequency is 1.8GHz.
 

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