FM dipole antenna - antenna does not operate right

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regret_86

Joined: 29 Mar 2009
Posts: 8

08 Jul 2009 5:37 help meeeeeeeeee!!

I am simulating a FM dipole antenna ithat operate at 88 -108 Mhz in HFSS . But this anten operates wrong.
could do anybody help me?

e_m_c

Joined: 07 May 2008
Posts: 94
Helped: 14
Location: Land

08 Jul 2009 17:26 help meeeeeeeeee!!

if you'll attach your model it is more probable that you'll be helped.

regret_86

Joined: 29 Mar 2009
Posts: 8

09 Jul 2009 4:45 Re: help meeeeeeeeee!!

here is this antenna that i am simulating!! I hope that you can help me!!

thanks

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e_m_c

Joined: 07 May 2008
Posts: 94
Helped: 14
Location: Land

09 Jul 2009 7:31 help meeeeeeeeee!!

There are no specified clearly dimensions fo the antenna and tubes diameters. Don't you have more exact geometry specification of the antenna?

regret_86

Joined: 29 Mar 2009
Posts: 8

09 Jul 2009 11:03 Re: help meeeeeeeeee!!

yeah! this is antenna that I simulated in HFSS.

help me, please

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regret_86

Joined: 29 Mar 2009
Posts: 8

04 Aug 2009 10:51 Re: help meeeeeeeeee!!

hi!

Do you have a example about VHF/UHF antenna that is simulated successfully?
Can you send it for me?
I simulated many times but i don't success.
Crying or Very sad

Thanks!

jongjong

Joined: 02 Jul 2009
Posts: 23
Helped: 3

05 Aug 2009 7:27 help meeeeeeeeee!!

how about using CST Microwave simulation you might get a success

regret_86

Joined: 29 Mar 2009
Posts: 8

05 Aug 2009 7:43 Re: help meeeeeeeeee!!

exactly, I simulated with ansoft HFSS v.11. I didn't use CST.
I tried many times to simulate somes kind of UHF/VHF antenna but i still successed.

Can you guide me the way to simulate kind of this antenna.

thank you!!

micky74

Joined: 17 May 2003
Posts: 36
Helped: 2

07 Aug 2009 8:00 Re: help meeeeeeeeee!!

You have not included in the excitation in your simulation so how do I know that you have simulate correctly. Pls attach your full simulation (with the excitation here).

regret_86

Joined: 29 Mar 2009
Posts: 8

07 Aug 2009 9:42 Re: help meeeeeeeeee!!

I think that i simulated incorrectly.So, if you have a example about UHF/VHF antenna that you simulated successfully, can you give me?
I want to reference your example to simulate another antenna.

thank you so much!

micky74

Joined: 17 May 2003
Posts: 36
Helped: 2

07 Aug 2009 18:46 Re: help meeeeeeeeee!!

I've sent you a working simulation file, but pls improve on it because I did not spend much time optimizing it.

regret_86

Joined: 29 Mar 2009
Posts: 8

09 Aug 2009 3:29 Re: help meeeeeeeeee!!

Dear Micky74

Thank you for your help!

I recived your file but i can't not open this file.I tried to change .pdf to .hfss but i can't not open this file.Can you send me Hfss file?

thank you so much!

Added after 3 minutes:

Dear Micky74

I opened the file that you sent me!!

thanks !

regret_86

Joined: 29 Mar 2009
Posts: 8

12 Aug 2009 2:21 Re: help meeeeeeeeee!!

Dear Micky74

I changed some parameters of the antenna that you sent me but the result is not good. can you simulate again this antenna and send me, please?

Thank you so much.

micky74

Joined: 17 May 2003
Posts: 36
Helped: 2

12 Aug 2009 15:27 Re: help meeeeeeeeee!!

I thought I've sent you an antenna model that works from 88 to 108MHz? Basically you just have to adjust the arm length of the dipole to get even better return loss. Or you can change the shorted portion at the coaxial outer sleeve.

I'm not sure what parameters you have changed so that it won't work now. Why don't you send me your revised version and I do a check on it?