Download Theory of electromagnetic wave propagation by Charles Herach Papas PDF
By Charles Herach Papas
This glorious graduate-level textual content discusses the Maxwell box equations, radiation from monochromatic assets in unbounded areas, radiation from twine antennas, radio-astronomical antennas, electromagnetic waves in a plasma, the Doppler impact and more.
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Sample text
Int = f Vo time-average w. dV magnetic (68) and electric energies Monochromatic stored inside Vo. 1m J A. regions When A coincides with Aoo it becomes S dA n' sources in unbounded = - ~ 1m J Vo J*. E dV where W mex = J 11) V-Vo dV m Wex = • J dV 11) V - Vo (70) • denote the (external) time-average magnetic and electric energies stored outside Vo. In the far zone, S is purely real and consequently Eq. (69) reduces to From this relation it is seen that the volume integral of - (~) 1m (J*. , inside Vo and outside Vo• A relation involving only the external energies is obtained by subtracting Eq.
W. , and Ronold King, Proc. IRE, 31: 693 (1943). 3 See, for example, S. A. Schelkunoff and H. T. Friis, "Antennas: Theory and Practice," chap. , New York, 1952. 1 2 42 Radiation from wire antennas current centers on the evaluation of the so-called radiation vector N defined by the integrall N J = Vo e-ike,'r'J(r')dV' (12) where er is the unit vector pointing from the origin to the point of observation and r' is the position vector extending from the origin to the volume element dV'. The required information on J can be obtained either by solving the boundary-value problem which the analytical determination of J poses or by choosing the current on empirical grounds.
Although the determination of the antenna current is a boundary-value problem of considerable complexity, a sufficiently accurate estimate of the current distribution can be obtained in the case of thin wires by assuming that the antenna current is a solution of the onedimensional Helmholtz equation and hence consists of an appropriate superposition of simple waves of current. , radiation resistance and gain, because the far-zone field in almost all directions is insensitive to small deviations of the current from the exact current.