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hfss coax feed diameters - how to calculate ?

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mtu

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dielectric feeds+coaxial feed

I need to to drive a patch with coax probe. I want to know how to calculate coax outer diameter and inner conductor diameter.?
Is there any relation with frequency?

Irfan
 

Re: hfss coax feed diameters

ASA, Mustafa

Thanks you really helped me
Irfan
 

Re: hfss coax feed diameters

Hi Irfan,

You are welcome.

If you you want to make the simulation easier, use the dielectric as free space with epsilon=1.


regards
 

Re: hfss coax feed diameters

I used calculator, with 2.4 GHz and 50 ohm line with air and copper.
The inner and outer dia seems to be quite immpractical like d inner=0.146777mm and d outer=0.49999mm. is it ok?

irfan
 

hfss coax feed diameters

depend on dielectric of feed substrate, if you choose air, the ratio of outer and inner diameter is 2.3.

Edmund
 

hfss coax feed diameters

Ratio is coming 3.5 in mtu's case not 2.3
 

Re: hfss coax feed diameters

Hello,

The correct equation used to calculate the dimensions is below:

Z=60/√(epsilon)×ln (b/a)

and when epsilon equals one then:

Z=60×ln(b/a)
 

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