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Nexxim Simulator > Gap
![[spacer]](1p.gif){kind=small}
 Netlist FormatAn instance of a coplanar waveguide gap has the following netlist syntax: ACPWGAP:xxxx n1 n2 COMPONENT=cpw_gap W=val G=val GAP=val SUBSTRATE=substrate_name n1 and n2 are the names of the nodes attached to the gap. The entry COMPONENT=cpw_gap identifies the element. The SUBSTRATE=substrate_name is the coplanar waveguide substrate model name selected for the design (see Selecting a Coplanar Waveguide Substrate for details).
Netlist ExampleACPWGAP:5 Port1 Port2 W=1.1mm G=0.75mm GAP=1.5mm COMPONENT=cpw_gap SUBSTRATE=CPW1 where CPW1, the selected layout technology or substrate type, has a definition such as: .SUB CPW1 CPW( Notes1. Quasi-Static behavior is assumed in the analysis. This assumption is valid for most CPW applications in a wide frequency range. 2. Only the symmetrical case is considered. 3. The model computes the equivalent PI-network capacitances. 4. In the derivation for the capacitances, an infinitely thick homogeneous substrate is assumed. Thus, these expressions are limited to thick CPW substrates (t > W + 2G). References[1] Gevorgian, S., Deleniv, A., Martinson, T., Galchenko, S., Linner, P. and Vendik, I., “CAD model of a gap in a coplanar waveguide,” Int. J. Microw. Millim.-Wave Computer-Aided Eng., pp. 369-377. [2] Dib, N., ``Comprehensive study of CAD models of several coplanar waveguide discontinuities, '' IEEE Proc-Microwave Antennas Propagation, Vol. 152, No. 2, April 2005, pp. 69-76.
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