An efficient analysis of high frequency interference phenomena using a new implementation of the transmission line matrix method

An efficient analysis of interference is crucial in the optimization of high frequency circuit configurations and performance. In addition, EMI/EMC analyses typically involve a very wide band of frequency. This makes it necessary to develop numerical models that remain reasonably accurate over a relatively wide frequency band. An efficient hybrid method is presented for the analysis of the interference phenomenon in high frequency communication circuits. The method is based on the transmission line matrix (TLM) method augmented with a time-domain integral equation formulation to account for the radiation of equivalent sources on boundary surfaces. Since the formulation is in the time domain, wide band effects are easily and accurately modeled. A similar method was previously used for the analysis of radiation from microstrip patch antennas and we display its utility in modeling the interference. The proposed method is highly efficient for structures containing circuits with large separation distances, because in contrast to the classical application of the TLM method, the memory and processing time requirements of the new method are independent of the distances between interfering circuits.