tailieunhanh - Wave Propagation 2010 Part 20

Tham khảo tài liệu 'wave propagation 2010 part 20', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 562 Wave Propagation ranging from 110 degrees to 140 degrees and from 220 degrees to 250 degrees in the closer vicinities ranging to the incidence side than these angles the electric field strength in case the round convexities are in existence is higher than in case they are not in existence. That is to say it is imagined that although reflection in an incident side is increased and penetration in the rear side is decreased the diffraction in a rear side is not so changed. Fig. 8. A comparison of measurement results of electric field strength around the flat wall model and around the building model with walls where round convexities are periodically in existence on the outside wall Illustrated in Figure 9 are the measurement results simultaneously shown with the electric field strength distributions in case the radius of the round convexity is slightly greater than the wavelength and in case the radius is slightly smaller than the length in relation to a building model with walls having round convexities. Comparison of these two measurement results reveals that penetrating wave is increased with the model whose radius of the round convexities is smaller and the reflection wave is decreased. However from the fact that considerable change is noted with the electric field strength on the square portion in the diagonally rear side of the building as is known from the result in Figure 8 it is imagined that almost none of influence by diffraction is to be seen. At the final stage the whole of the results illustrated in Figure 6 through Figure 8 are shown simultaneously in Figure 10. By so doing it is explained that the electromagnetic waves propagating in the vicinity of the building are subject to change depending upon the thickness of the wall of the building presence or absence of metal skeletons and shape of the surface of the outside wall. Especially the fact that existence of the round convexities on Electromagnetic Waves Propagating Around Buildings 563 the .