Analysis of Wave Propagation in a Concrete Building Model by the CIP Method

The computer simulation of electromagnetic (EM) wave propagation in time domain plays an important role of development of wireless communications. Higher frequency is required for high data-rate communication; it makes the simulation large scale computation. Up to now, the FDTD method have been widely used for the computer simulation[1]. Recently, another method, the constrained interpolation profile (CIP) method, which had been developed in hydrodynamics [2], has been utilized for the analysis of EM wave propagation [3, 4, 5, 6]. The CIP method has been thought an attractive numerical technique which can analyze EM wave propagation. The method is not necessary to give any absorbing boundary condition in general. The CIP method might obtain relatively accurate results compared with the FDTD method when the available memory size are the same[3]. The dispersion characteristics of the CIP method has shown to be better in phase but worse in amplitude than those of the FDTD method[7]. Therefore the CIP method has some better characteristics than the FDTD method. In addition to theoretical evaluation, it is necessary to evaluate the CIP method experimentally from practical point of view. This paper presents a study to verify the effectiveness of the CIP method for analysis of electromagnetic wave propagation in 2D structure from experimental point of view. The structure is a typical model of a concrete building which consists of passage with a crossjunction and concrete partitions. The electromagnetic waves from a line source located in the passage are numerically analyzed by the CIP method and the results are compared with not only those analyzed by the FDTD method but also the measurement data obtained by experiment using a scale model. These comparisons show the effectiveness of the CIP method for analyzing the electromagnetic waves propagation in the 2D structures experimentally.