[SI-LIST] Re: Coaxial TEM Cutoff Frequency
- From: Elie Issa <elie_michael_issa@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sat, 10 Jan 2004 18:00:12 -0800 (PST)
Some additional input on this subject. The loss associated with the
cutoff frequency of higher modes is reflective in nature and not
dissipative.
It will occur in perfectly lossless xlines.
The multiple reflections would cause a condition of resonance
which practically lead to a reflection coefficient of |1|.
Since a coax line would act as a bandpass filter; its maximum
operating 'cutoff' frequency is associated with the lowest
cuoff frequency of higher modes, the TE11.
The equation quoted earlier in the thread, is an
approximation of the TE11 mode cutoff frequency for coax lines.
Regards
Elie
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