Study On The Effect Of Reinforced Concrete Wall Structure On Communication Signal

With the rapid development of science and technology and the continuousexpansion of the city, cities’ electromagnetic environment become increasinglycomplex, on the other hand due to unreasonable building wall design, indoor wirelesscommunication quality is getting worse. In order to meet people’s wirelesscommunication quality requirements in indoor and outdoor, and specialelectromagnetic performance requirements in certain buildings or certain areas, sodesigners should consider the both requirements when they design the building wall.Most modern buildings consist of reinforced concrete structure, a systematic study onthe effects of the reinforced concrete wall structure on communication signals andpredicting the wall on communication signals attenuation before constructing the wallis necessary.In this paper, the different wall structures of Reinforced Concrete(RC) wall havebeen computed by using the Finite Difference Time Domain (FDTD). These resultsobtained in time-domain become transmission coeiffcients of the various structures ofRC wall by Fourier transform and calculated. The effects of wall structures ofreinforced concrete (steel mesh size, steel radius, wall thickness, double reinforcedconcrete wall structure, the distance of double mesh in RC wall, rectangular mesh, thelocation of the single mesh in RC wall, the volume ratio of steel and concrete, etc.) oncommunication signals have been analyzed according to their transmissioncoefficients. The resonant frequency of reinforced concrete wall is discussed by usingthe equivalent model. Finally, the transmission properties of electromagnetic wavesthough RC walls are measured by using the free space method, and the measured dataand the simulation results are compared and analyzed.Study results that the laws of the amplitude attenuation and the resonancefrequency distribution of the transmission coefficient when these parameters change,and resonant frequencies of the reinforced concrete wall are in accordance with thetheoretical values calculated by using the equivalent model, which verifies therationality of the equivalent model. Compared with the results which are computed by using FDTD method, the both results are in good agreement. Conclusions have somesignificance for the analysis of building walls on communication signal attenuationand the wall design that meet the communication requirements.