Plane wave coupling to multiple conductor transmission lines above a lossy earth

The current induced on an infinite multiple conductor transmission line located above a lossy homogeneous medium due to a transient plane wave is discussed. An exact solution is formulated in the frequency domain using a spatial transform technique. The widely utilized quasi-TEM approximation is derived directly from the exact solution with emphasis on the physical consequences of the assumptions made. Both frequency domain and time domain numerical results are presented for typical transmission structures and documented electromagnetic pulse (EMP) excitations. Comparison of the quasi-TEM approximation to the exact solution is made in order to study the validity of its application in EMP coupling problems. The modeling of the EMP source as an incident plane wave is examined by comparing the induced current due to a dipole source with its steepest-descent contribution. >

[1]  J. R. Carson.  Wave propagation in overhead wires with ground return , 1926 .

[2]  EMP coupling to power lines , 1978 .

[3]  James R. Wait,et al.  Propagation Along a Braided Coaxial Cable in a Circular Tunnel , 1975 .

[4]  David C. Chang,et al.  Excitation of an infinite antenna above a dissipative earth , 1975 .

[5]  David C. Chang,et al.  ELECTROMAGNETIC WAVE PROPAGATION ALONG HORIZONTAL WIRE SYSTEMS IN OR NEAR A LAYERED EARTH , 1981 .

[6]  Tai Tsun Wu,et al.  The horizontal wire antenna over a conducting or dielectric half space: Current and admittance , 1974 .

[7]  Transient plane wave coupling to transmission lines above a lossy earth , 1988, 1988 IEEE AP-S. International Symposium, Antennas and Propagation.

[8]  Liang C. Shen,et al.  Scattering by wires near a material half-space , 1982 .

[9]  Robert G. Olsen,et al.  The excitation of current on an infinite horizontal wire above earth by a vertical electric dipole , 1977 .

[10]  R. Olsen,et al.  Current induced on a pair of wires above earth by a vertical electric dipole for grazing angles of incidence , 1980 .

[11]  David C. Chang,et al.  Modal theory of long horizontal wire structures above the earth: 2, Properties of discrete modes , 1978 .

[12]  James R. Wait.  Theory of Wave Propagation Along a Thin Wire Parallel to An Interface , 1972 .

[13]  Peter R. Bannister.  Electric and Magnetic Fields Near a Long Horizontal Line Source Above the Ground , 1968 .

[14]  K. C. Chen.  Time harmonic solutions for a long horizontal wire over the ground with grazing incidence , 1985 .

[15]  R. Sorbello,et al.  The horizontal-wire antenna over a dissipative half-space: Generalized formula and measurements , 1977 .

[16]  R. Olsen,et al.  Current induced by a plane wave on a thin infinite wire near the earth , 1974 .

[17]  David C. Chang,et al.  Modal theory of long horizontal wire structures above the earth: 1, Excitation , 1978 .