Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TE4
Session:
Number:3TE4-6
Numerical Examination of EM Wave Shadowing by Human Bodies Between Transmitter and Receiver
M. Yokota, T. Ikegamai, Y. Ohta, T. Fujii,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Various wireless communication services such as cellular phone and WLAN etc. in indoor environment are provided. In this case, mobile terminals frequently remain stationary. So, the communication characteristics are considerably different from those in outdoor mobile use. Now recently, the number of customers who use cellular phones indoors is rapidly increasing. Many recent studies have tackled static terminals, but all base their modeling approaches on empirical formula [1], [2]. In this case, mobile terminals used in a stationary condition receive a level variation different from that in a moving condition. Then, it was proposed that a physical channel model for a static terminal used in indoors [3]. As shown in Fig. 1, the proposed model can be considered physical parameters such as the number of moving people, their size and moving speed in order to evaluate various situations preciously [4], [5]. An experimental verification has been performed [6]. The model is two dimensional, and assumes that a moving person is represented as a disk with diameter of W [m] and its moving person perfectly absorbs the power of the paths across this width of W for simplicity. In the channel model for indoor static mobile terminals, W which corresponds to human body size is one of the most important parameters. So far, each human body was modeled when human body can be assumed to exist independently even if many bodies approach. However, this assumption is not exact for many human bodies, since the absorption of electromagnetic wave is not independent due to mutual interference. So, the scope of the conventional modeling that bodies assume to exist independently is clarified in this paper. Also, another modeling is proposed when the bodies approach and can not treat independently. The scattering problem is examined by using Method of Moment (MoM) as the numerical technique. As numerical results, the received power for two circular cylinders, which are the simplest model for modeling many human bodies, is examined from the viewpoints of changing the position of the cylinders. Also, the superposition of the scattered field by each cylinder is compared with that of the original situation.