[SI-LIST] Re: Coaxial TEM Cutoff Frequency
- From: "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
- To: "Moeller, Merrick" <mmoeller@xxxxxxxxxxxxxxx>
- Date: Fri, 12 Dec 2003 10:33:15 -0600
The units.=20
d =3D outer radius inner conductor meters
D =3D inner radius outer conductor meters
When calculated seems to be reasonable.
Merrick
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Moeller, Merrick
Sent: Friday, December 12, 2003 10:21 AM
To: Rich Peyton
Cc: Si-List (E-mail)
Subject: [SI-LIST] Re: Coaxial TEM Cutoff Frequency
I found this in a paper online that states that
TE11 mode which is the lowest of all the higher order
modes, and most likely present in a coalial line can
be determined by the following.
Wavelength =3D3D PI(d+D) Frequency =3D3D velocity/wavelenght=3D3D
c/(PI(d+D)sqrt(ur*er)
The ur would be the relative permiability????
Merrick
-----Original Message-----
From: Rich Peyton [mailto:p2rich@xxxxxxxxxxxxx]
Sent: Friday, December 12, 2003 6:16 AM
To: Moeller, Merrick; 'Si-List (E-mail)'
Subject: RE: [SI-LIST] Coaxial TEM Cutoff Frequency
I have the first equation ----=3D20
Here's a good link for coax equations.
http://www.rfcafe.com/references/electrical/coax.htm
Have a good weekend
Rich
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On
Behalf Of Moeller, Merrick
Sent: Thursday, December 11, 2003 2:58 PM
To: Si-List (E-mail)
Subject: [SI-LIST] Coaxial TEM Cutoff Frequency
Experts,
I have been searching for a hand calculation of cutoff frequency
for
a coaxial contact. I have been able to find many for coaxial cable.
However,
I do not know the assumptions that are being made to derive these
equations.
Cutoff Frequency =3D3D 7.5/SQRT(er)(D+d) or Cutoff Frequency=3D3D
((2*c)/(PI*sqrt(er)))*1/(D+d)
D =3D3D Sheild inner diameter
d =3D3D Conductor outer diameter
Any insight?
Thanks,
Merrick
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