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huiyuzz
Joined: 22 Jul 2004
Posts: 46
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 29 Jul 2004 9:29 Radiation resistance of antenna |
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Hi,
how do i obtain the radiation resistance of my dipole simulation using HFSS??
Thanks
Cheers
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eirp
Joined: 11 Dec 2001
Posts: 807
Helped: 9
Location: Phase center
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| 29 Jul 2004 9:36 Re: Radiation resistance of antenna |
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| huiyuzz wrote: |
Hi,
how do i obtain the radiation resistance of my dipole simulation using HFSS??
Thanks
Cheers |
If you have non loosy dipole, the rad. resistance is equal to R=Re{Zin}.
For loosy cases you have to calculate the radiation resistance from far field distribution
cheers
eirp
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huiyuzz
Joined: 22 Jul 2004
Posts: 46
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| 29 Jul 2004 10:13 Re: Radiation resistance of antenna |
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Hi,
Where to obtain Zin?? Under the "Solution Data" function?
What does the Z matrix represent?
Actually I'm trying to verify my half-wave dipole simulation by checking the radiation resistance= 73 ohm.
Cheers
huiyuzz
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KMPA
Joined: 04 Dec 2003
Posts: 89
Helped: 2
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| 29 Jul 2004 13:39 Re: Radiation resistance of antenna |
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Hi,
If your port Characterictics Impedance is Zo, the Zin will be as below:
Zin = Z0*(1+S11)/(1-S11)
this function can be defined simply in Output Varible menu from Trace menu.
Regards
KMPA
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eirp
Joined: 11 Dec 2001
Posts: 807
Helped: 9
Location: Phase center
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| 29 Jul 2004 14:13 Re: Radiation resistance of antenna |
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Hello
I've calculated your dipole's impedance using CST MWS coz I'm more familiar with it.
The results fit. Theoretical 1st resonance (for inf. thin dipole) should appear at 97.4MHz, predicted by MWS is shown at 90.7MHz (decreased because your dipole is of finite thickness)
Radiation resistance at first resonance is calculated 76.12 Ohm.
Cheers,
eirp
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springf2000
Joined: 13 Jun 2004
Posts: 414
Helped: 18
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| 29 Jul 2004 14:20 Re: Radiation resistance of antenna |
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| the HFSS can calculate the Zin ,please check the post data process carefully
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huiyuzz
Joined: 22 Jul 2004
Posts: 46
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| 30 Jul 2004 7:32 Re: Radiation resistance of antenna |
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Hi,
I've managed to simulate my Zin plot against Frequency. My radiation boundary is insufficient as ..eirp says
Thank You ..eirp and ..KMPA.
Cheers
huiyuzz
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huiyuzz
Joined: 22 Jul 2004
Posts: 46
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| 30 Jul 2004 7:38 Re: Radiation resistance of antenna |
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My project.
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