Fast Method to Include Parasitic Coupling in Planar Microwave Circuits Calculations

As modern circuits become smaller and the frequencies that they work at become higher, inevitably, parasitic coupling within the circuits starts to influence the behavior of the circuit more and more. Therefore it is necessary to include the influence of mutual coupling in the circuit simulators that are used to design the circuit. In this paper the circuit is divided into three classes of building blocks: transmission lines, small discontinuities (components) and meshed structures (solved using classical MoM). We will describe software modules that can calculate the couplings between these classes. The three modules are compatible with each other because they use the same parameters (incoming and outgoing waves at the ports, incident fields and radiating currents). They can be easily combined with a normal circuit simulation engine to include mutual coupling.