[SI-LIST] Re: Coaxial TEM Cutoff Frequency
- From: "George Tang" <gtang@xxxxxxxx>
- To: <mmoeller@xxxxxxxxxxxxxxx>,"Si-List (E-mail)" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 11 Dec 2003 13:24:17 -0800
Hi Merrick,
Coaxial in TEM mode has no cutoff frequency, if you assume lossless. Of
course, as you go higher in frequency, the lossless assumption will break
down and the TEM mode model will not be valid due to an electric field
component in the direction of propagation. But as far as cutoff frequency
goes, coaxial in TEM mode does not have a cutoff as defined in TE or TM
modes in waveguides.
Regards,
George
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Moeller, Merrick
Sent: Thursday, December 11, 2003 11:58 AM
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 = 7.5/SQRT(er)(D+d)
or
Cutoff Frequency= ((2*c)/(PI*sqrt(er)))*1/(D+d)
D = Sheild inner diameter
d = Conductor outer diameter
Any insight?
Thanks,
Merrick
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