Abstract

The existence of leaky modes on printed circuit transmission lines has been the subject of considerable interest recently1. These modes are usually undesirable since they result in increased attenuation of the signal, and may result in crosstalk with adjacent circuit components and other spurious effects, including interference with bound modes that also propagate on the line2. Of particular interest is the existence of leaky dominant modes on the structure2,3. A dominant leaky mode (as opposed to a leaky higher-order mode), is one that has a current distribution on the conducting strip that closely resembles that of a quasi-TEM mode of propagation. Therefore, such a leaky mode will typically be excited quite strongly by a customary feed. Leaky dominant modes have been found on multilayer stripline structures2, coplanar waveguide and slotline4, coplanar strips5, microstrip line with an anisotropic substrate6, and recently on microstrip line with an isotropic substrate7.

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