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Transmission Line Phase Shifters

November 29th Fact-of-the-Dayy

Transmission line propagation delay often is used to phase radiation from two or more antenna radiators. If a line is terminated by a load that exactly matches its characteristic impedance the line is nonresonant, there is only a single wave train, and voltage and current down the line both shift in phase uniformly at the rate of 2PI radians for each wavelength. However, phase relations are more complicated if a line is not terminated in its characteristic impedance. The phase distribution still changes 180-degrees from one voltage or current minimum to the next, but most of the phase shift occurs in the vicinity of the minima. ©2004 Martek International All rights reserved.


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