Steady-state analysis of signal transmission in evanescent channels

Transfer functions of evanescent transmission channels are investigated in detail. Based on a Taylor expansion of the corresponding phase and attenuation constants, different characteristic transmission parameters are introduced (or revisited). The steady-state propagation of an RF carrier signal mo...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2003-05, Vol.51 (5), p.957-964
Main Authors: Omar, A.S., Kamel, A.H.
Format: Article
Language:English
Subjects:
Antennas
Attenuation
Carrier frequencies
Channels
Constants
Constraining
Drift
Power measurement
Pulse modulation
Radio frequency
RF signals
Signal analysis
Steady-state
Taylor series
Transfer functions
Velocity measurement
Wave propagation
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Summary:Transfer functions of evanescent transmission channels are investigated in detail. Based on a Taylor expansion of the corresponding phase and attenuation constants, different characteristic transmission parameters are introduced (or revisited). The steady-state propagation of an RF carrier signal modulated by a narrowband base-band Gaussian pulse in evanescent waveguide sections is then studied. It is shown that temporal pulse compression as well as carrier frequency drift usually accompany such transmissions. It is also shown that under steady-state conditions, conventionally defined transmission velocities are not necessarily restricted to be less than or equal to c (speed of light in free space) as long as they are not related to direct measurements. Only the power coupling accompanying a measurement is responsible for limiting the transmission velocity of the measured physical quantity below or equal to c.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2003.811472