On the Definition of Quasi Lumped Elements in Planar Microwave Circuits

Planar microwave circuits generally contain resistors, capacitors, diodes etc.. These elements are interpreted as lumped elements in common simulation tools in spite of their finite geometric dimensions. Establishing a spectral domain analysis, by which lumped elements as well as line sections of finite surface impedance can be analyzed, it becomes possible to distinguish both cases. Thus, we can give a measure for the definition of quasi lumped elements based on electromagnetic field theory.