C_AIR represents a single bridge as the connection of ground planes. Such bridges are necessary in CPW-circuits in order to suppress the higher order modes. The bridge dimensions are defined using the line type addressed by C_LTYP and the bridge type addressed by C_BTYP.
|C_LTYP||ID of coplanar transmission line applied at ports 1 and 2|
|C_BTYP||ID of air-bridge type definitions|
|C_SUB||ID of coplanar substrate definition|
|C_GRID||ID of simulation control data|
|TEMP||ID of element temperature definition used for noise computation|
For the modeling of the C_AIR element, a p-network is used. The parasitic electric field due to the air-bridge is represented by the lossy shunt capacitance Cp. The inductance L is used for the modelling of the current disturbance in the area of the bridge. The metallic losses within the bridge itself are taken into account by the use of a frequency dependent resistance R.
|The equivalent circuit parameters are derived from quasi-static FD-calculations. The connected lines at ports are modeled as C_LIN elements and are represented by their characteristic impedance ZL and phase constant b. There is no limitation due to the length of connected lines (L in selected C_BTYP).|