Patent ID: 6700463
Filing Date: 2004-03-02
Classification: H01P,H05K

Abstract:
A transmission line structure for reduced coupling of signals between circuit elements on a circuit board, comprising:a circuit board formed from a dielectric substrate material; an RF transmission line disposed on said circuit board, said RF transmission line comprising at least one elongated conductive metal trace having opposed elongated edge portions; a pair of elongated substrate boundary regions, said substrate boundary regions coextensive with at least a portion of said at least one elongated conductive metal trace, each of said boundary regions positioned adjacent to a respective one of said opposing edge portions to define an elongated substrate channel region; said substrate boundary regions defining a transition from a first set of substrate characteristics to a second set of substrate characteristics wherein propagation of electromagnetic energy from said channel region to other portions of said circuit board external to said channel region is reduced by the presence of said boundary regions.