Lumped elements are components, devices, or circuits whose overall dimensions are very small compared to the wavelength. As a result, they are considered to be dimensionless compared to the dimensions of a mesh cell. In fact, a lumped element is equivalent to an infinitesimally narrow gap that is placed in the path of current flow, across which the device's governing equations are enforced. Using Kirkhoff's laws, these device equations normally establish a relationship between the currents and voltages across the device or circuit. Crossing the bridge to Maxwell's domain, the device equations must now be cast into a from o boundary conditions that relate the electric and magnetic currents and fields.
Click here to learn more about the theory of '''[[Computing_Port_Characteristics_in_Planar_MoM#Modeling_Lumped_Elements_in_Planar_MoM| Modeling Lumped Elements in Planar MoM]]'''.
EM.Picasso allows you to define passive circuit elements: '''Resistors'''(R), C'''apacitors'''(C), I'''nductors'''(L), and series and parallel combinations of them . To define a lumped RLC circuit in your planar structure, follow these steps: