Different microstrip line discontinuities on a single field-based equivalent circuit model

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The method of moments (MoM) solves all microstrip line discontinuities by the joining of segments of different sizes. A single equivalent circuit model may then be constructed to solve many line discontinuities that are related to the joining of half-lines of different widths, provided that the physics behind the MoM is well interpreted. From an existing open-circuit model the paper constructs an alternative open-circuit model that applies to all such line joining discontinuities - for example, the open-circuit itself, step, right-angle bend and T-junction. The maximum error is 1% without the use of any arbitrary constant.