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abhaykotnala
Joined: 21 Sep 2008
Posts: 10
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 23 Sep 2008 4:12 probe in hfss |
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| my problem is how to determine the radius for probe,coax,coax pin and the height for coax
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zirtapoz
Joined: 25 Dec 2007
Posts: 143
Helped: 8
Location: finite space
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| 23 Sep 2008 8:06 Re: probe in hfss |
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link makes sense for calculating dimensions of coax
good luck
http://www1.sphere.ne.jp/i-lab/ilab/tool/cx_line_e.htm
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abhaykotnala
Joined: 21 Sep 2008
Posts: 10
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| 23 Sep 2008 13:58 Re: probe in hfss |
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thanx man that was gud.....
hey can u guide me on a problem i have...
see i am making an H shaped microstrip antenna in hfss......
i made a substrate of given dimensions using box option......which material is prefferable for the substrate
1. rt duroid
2 vacumm?
for making the ground plane i made a rectangle at bottom and assignes perfectly dielectric to it.....similarly i made the patch using rectangle at the top using rectangle giving it perfectly electric boundary conditions to it
should i make these things of box type with some height for better results or its ok?
how much the coaxial dimensions affect the results of this structure?
i want to short the patch and ground....how should i do it/?
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zirtapoz
Joined: 25 Dec 2007
Posts: 143
Helped: 8
Location: finite space
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| 23 Sep 2008 14:23 Re: probe in hfss |
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First ; you have to decide about bandwidth and resonance frequency. dielectric permittivity effect on bandwidth and frequency. (air small banwidth etc.)
second you have to draw H shaped patch over dielectric and also assign it perfect E,
Ground plane should be assigned perfect E with infinite or finite ground plane option, (Also you need a cut on it for coax probe)
Dielectric box doesnt need assignment of perfect etc.
third; dielectric box height effects banwidth and also resonance frequency. Similiar condition exist on coax measures too. Cos impedance changes with dimensions.
good luck[/b]
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