TAILIEUCHUNG - Wave Propagation 2010 Part 18

Tham khảo tài liệu 'wave propagation 2010 part 18', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 502 Wave Propagation while for a long pulse we have ỉkỴcoPậ. sin2 ffc sin2-ậ-ì cL r J 2 I. 2 J s Iq tan2-ậ- sin2ffc cos2-ậ-ì cL r 2 I. 2 77 where Io 8 2 mcj sm is the permittivity of the medium. For subliminal and superluminal phase velocities p h 1 the angular factors of the field components have more complicated form 72 their dependence on 3 h and 0ol is illustrated in Fig. 7. As seen from the figure for subluminal phase velocity the tendency of Bq p to be directed at ỚQ 0 and at ỚQ 71 clearly manifested at p h 1 holds down to p h . For superluminal phase velocities the angular factors demonstrate lateral towards ỚQ 7112 shift of the propagation directionality which is observed in the vicinity of the singularity curves ỚQ arccos for Rg j and 0ol 7Ĩ- arccos for . For analysis of more complicated factors R pị let US represent them in a two-parameter form sin r l PphP e so - As functions of and Ph the parameters -1 and H1 1 demonstrate different behaviour varies from -co to co and has the area of singularity p h while the sign of Á 1 is always positive and the area of singularity is limited to the point Pph 3 0 see Fig. 8. Note that lim l lim p and q 1 . The angular factors R ỉì. are p- P 1 ũ P finally plotted as functions of and dp T in Fig. 9. Frequency transform The modulation frequencies corresponding to the terms Bg p T l composing the magnetic field strength are defined by the arguments of the modulation factors g p T . As exp a 0 r-r and exp ik exp a 0 r-rj always oscillate with the initial modulation frequency a 0 the frequency transform is observed only in B p ị . The frequency transform range can be found considering wave propagation in the two limiting directions parallel 0p T 0 and anti-parallel 0p T 71 to the direction of propagation of the source current. In the case 0p T 0 one has Tp T - Tp T Tp T -Zp T and coming back to the initial frame of reference T z one can express the modulation factors as Electromagnetic Waves Generated by Line .

TÀI LIỆU LIÊN QUAN
69    272    11
TỪ KHÓA LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.