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savedadogs
Joined: 11 Dec 2003
Posts: 95
Helped: 11
Location: California
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 31 Dec 2003 5:56 Resonant Frequency of Patch Antenna |
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Hi all.
I am trying to learn how to use HFSS, specifically the Eigenmode Solver. I am trying to find the resonant frequency of a microstrip patch antenna. How can I do so? I drew the patch, substrate, and ground. What do I need to do next? Any help will be great.
Thank you,
Anthony
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Redi
Joined: 16 Dec 2002
Posts: 77
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| 31 Dec 2003 13:28 Re: Resonant Frequency of Patch Antenna |
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Hi,
Maybe you should use Driven Terminal or Modal solution. Draw patch, substrate, ground. Then feed the patch using microstrip line or coax. Draw the air box around your structure, the walls should be quarter wavelength far from your structure and add radiation boundary to it. Solve the problem with some frequency sweep in which you expect resonance frequency. Check the S11 parameter results to find the resonance frequency.
Greets,
Redi.
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caocao
Joined: 23 Nov 2003
Posts: 117
Helped: 3
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| 05 Jan 2004 15:36 Re: Resonant Frequency of fix Antenna |
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Hi
If S11 can not response the resonance frequency point(s) correctly in the frequency range ,or there is not a clear points ,what should we do ?
I think that we should predict the resonance point according the fix'es character .
Thanks !
| Redi wrote: |
Hi,
Maybe you should use Driven Terminal or Modal solution. Draw fix, substrate, ground. Then feed the fix using microstrip line or coax. Draw the air box around your structure, the walls should be quarter wavelength far from your structure and add radiation boundary to it. Solve the problem with some frequency sweep in which you expect resonance frequency. Check the S11 parameter results to find the resonance frequency.
Greets,
Redi. |
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Element7k
Joined: 07 May 2003
Posts: 388
Helped: 8
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| 05 Jan 2004 18:38 Re: Resonant Frequency of fix Antenna |
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Hi all,
for a simple p(at)tch antenna, you can either use formulas from books to derive dimensions of p(at)tch or if you have @nsoft designer, you can use the estimate function to estimate the dimensions. In that way, your s11 will never to out of freq range. Then u can play around with the p(at)tch after u got the basic resonant structure 
Cheers,
Element7k
| caocao wrote: |
Hi
If S11 can not response the resonance frequency point(s) correctly in the frequency range ,or there is not a clear points ,what should we do ?
I think that we should predict the resonance point according the fix'es character .
Thanks !
| Redi wrote: |
Hi,
Maybe you should use Driven Terminal or Modal solution. Draw fix, substrate, ground. Then feed the fix using microstrip line or coax. Draw the air box around your structure, the walls should be quarter wavelength far from your structure and add radiation boundary to it. Solve the problem with some frequency sweep in which you expect resonance frequency. Check the S11 parameter results to find the resonance frequency.
Greets,
Redi. |
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caocao
Joined: 23 Nov 2003
Posts: 117
Helped: 3
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| 06 Jan 2004 14:07 Re: Resonant Frequency of fix Antenna |
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Hi,
Yes, we can estimate the resonance frequency for sample patch model .But for a complex structure such as the coupling , multilayer or back cavity structure ?
What is the best method?Are there any formuals and availability methods ?
Thanks !
| Element7k wrote: |
Hi all,
for a simple p(at)tch antenna, you can either use formulas from books to derive dimensions of p(at)tch or if you have @nsoft designer, you can use the estimate function to estimate the dimensions. In that way, your s11 will never to out of freq range. Then u can play around with the p(at)tch after u got the basic resonant structure
Cheers,
Element7k
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eirp
Joined: 11 Dec 2001
Posts: 807
Helped: 9
Location: Phase center
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| 06 Jan 2004 14:31 Re: Resonant Frequency of fix Antenna |
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| caocao wrote: |
Hi,
Yes, we can estimate the resonance frequency for sample fix model .But for a complex structure such as the coupling , multilayer or back cavity structure ?
What is the best method?Are there any formuals and availability methods ?
Thanks !
| Element7k wrote: |
Hi all,
for a simple p(at)tch antenna, you can either use formulas from books to derive dimensions of p(at)tch or if you have @nsoft designer, you can use the estimate function to estimate the dimensions. In that way, your s11 will never to out of freq range. Then u can play around with the p(at)tch after u got the basic resonant structure
Cheers,
Element7k
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"analytically" it's possible only if you know Green's functions and you know them in closed form only for rectangle, circle, triangle, ellipse...
For these shapes resonant fq. can be computed quite easily.
For complex shapes in 2D you can compute eigenmodes ie in FEMLAB.
Rgz,
eirp
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