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Sending surface waves along coaxial cables: part 1 of this three-part series introduces the concept of surface waves and high-frequency, low-loss propagation along the surface of a single-conductor or high-impedance coaxial line.(DesignFeature)

Microwaves & RF

| May 01, 2009 | Elmore, Glenn | COPYRIGHT 2009 Penton Media, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

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 conductor having no outer shield. This non-radiating surface-wave mode, which has practical uses at RF through microwave frequencies, can exhibit very low attenuation and a relative propagation velocity of unity. This first ...

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