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July 2009 [Components] Applying Practical TM Mode Propagation, Part 3 Earlier parts of this article (see May and June 2009 issues) described TM mode propagation on a single unconditioned conductor. The mode has many practical applications for last-mile information transport and distribution, for example by using the existing worldwide power grid, and can be applied as a lightweight transmission line for aerial antennas. An obvious and promising class of applications for this transmission mode involves employing... June 2009 [Components] Launching TM Mode Onto A Single Conductor, Part 2 Last month, the first part of this three-part article series introduced a transversemagnetic (TM) propagation mode that is present with the better-known transverseelectromagnetic (TEM) mode in conventional coaxial transmission line. Put simply, waves move along a conductor having no outer shielding and no insulation or special surface conditioning. Part 2 will describe the TM mode around an unconditioned conductor, backed by models and measurements ... May 2009 [Components] Sending Surface Waves Along Coaxial Cables, Part 1 Coaxial cables had once been thought to support only a single transverse-electromagnetic (TEM) propagation mode. But a solution to the Maxwell-Heaviside equations supports the existence of a propagating transverse-magnetic (TM) surface-wave mode as well. This mode is suppressed by the outer conductor in coaxial cables of conventional impedance, but is dominant in higher-impedance coaxial cables and also on a single uninsulated and unconditioned... |
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