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Energy Propagation in Waveguides - Continued - 14183_28
Energy Propagation in Waveguides - Continued - 14183_30

Neets Module 11-Microwave Principles
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1-17 Figure 1-21.—The Poynting vector. The combined electric and magnetic fields form a wavefront that can be represented by alternate negative and positive peaks at half-wavelength intervals, as illustrated in figure 1-22. Angle " is the direction of travel of the wave with respect to some reference axis. Figure 1-22.—Wavefronts in space. If a second wavefront, differing only in the direction of travel, is present at the same time, a resultant of the two is formed. The resultant is illustrated in figure 1-23, and a close inspection reveals important characteristics of combined wavefronts. Both wavefronts add at all points on the reference axis and cancel at half-wavelength intervals from the reference axis. Therefore, alternate additions and cancellations of the two wavefronts occur at progressive half-wavelength increments from the reference axis. In figure 1-23, the lines labeled A, C, F, and H are addition points, and those labeled B, D, E, and G are cancellation points.






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