Qee lub ntsiab lus tseem ceeb ntawm hluav taws xob hluav taws xob hluav taws xob
1. Cov khoom siv hluav taws xob hluav taws xob ntau
Feem ntau hais lus, radar systems, TV thiab broadcasting systems, xov tooj cua zaus induction thiab nruab nrab cua sov cov khoom, xov tooj cua zaus thiab microwave cov khoom kho mob, ntau yam khoom siv hluav taws xob ua, kev sib txuas lus chaw nres tsheb, satellite ntiaj teb kev sib txuas lus chaw nres tsheb, cov chaw tsim hluav taws xob loj, cov khoom siv hluav taws xob thiab kev hloov pauv. , high-voltage thiab ultra-high voltage kis tau tus mob kab, subway tsheb ciav hlau thiab hluav taws xob tsheb ciav hlau, raws li zoo raws li feem ntau ntawm cov khoom siv hauv tsev, muaj peev xwm tsim tau ntau yam ntaub ntawv, frequencies, thiab intensity ntawm electromagnetic tawg qhov chaw.
2. Kev faib hluav taws xob hluav taws xob hauv cheeb tsam
Cov hluav taws xob hluav taws xob hluav taws xob feem ntau muab faib ua thaj tsam deb thiab ze- teb.
Ze ntawm thaj chaw thiab cov yam ntxwv
Ib cheeb tsam nyob rau hauv ib tug wavelength range nyob rau hauv lub teb qhov chaw yog feem ntau hu ua ib tug nyob ze- teb los yog induced teb. Qhov chaw ze ze feem ntau muaj cov yam ntxwv hauv qab no:
1) Nyob rau hauv qhov chaw ze, tsis muaj qhov sib npaug sib luag ntawm lub zog ntawm cov hluav taws xob thiab lub zog ntawm cov hlau nplaum. npe: E1377H. Feem ntau, rau cov chaw hauv cheeb tsam uas muaj hluav taws xob siab thiab tsis tshua muaj tam sim no (xws li xa cov kav hlau txais xov, feeders, thiab lwm yam), cov hluav taws xob hluav taws xob muaj zog dua li cov hlau nplaum. Rau cov khoom siv hluav taws xob uas tsis tshua muaj hluav taws xob thiab siab tam sim no (xws li pwm ntawm qee yam khoom siv cua sov induction), qhov chaw sib nqus yog ntau dua li qhov hluav taws xob.
2) Kev siv hluav taws xob hauv qhov chaw ze yog ntau dua li qhov nyob deb. Los ntawm qhov kev xav no, lub hom phiaj ntawm kev tiv thaiv electromagnetic yuav tsum nyob ze ntawm qhov chaw.
3) Kev siv hluav taws xob hauv qhov chaw ze ntawm qhov sib txawv ntawm qhov deb, ua rau muaj qhov tsis sib xws hauv qhov chaw no.
Far field thiab yam ntxwv
Lub spatial ntau yam nrog lub teb qhov chaw raws li qhov chaw nruab nrab thiab ib lub vojvoog dhau ib lub wavelength yog hu ua far-field lossis radiation field. Cov yam ntxwv tseem ceeb ntawm thaj chaw deb yog raws li hauv qab no:
1) Nyob rau hauv qhov chaw deb, yuav luag tag nrho cov hluav taws xob hluav taws xob hluav taws xob yog hluav taws xob thiab nthuav tawm nyob rau hauv daim ntawv ntawm cov hluav taws xob hluav taws xob, thiab qhov txo qis ntawm cov hluav taws xob siv hluav taws xob hauv daim teb no qeeb qeeb dua hauv qhov induced teb.
2) Hauv thaj chaw deb, muaj kev sib raug zoo ntawm lub zog hluav taws xob thiab lub zog hlau nplaum raws li hauv qab no: nyob rau hauv lub thoob ntiaj teb system ntawm units, E=377H, cov kev taw qhia ntawm hluav taws xob teb thiab magnetic teb ua hauj lwm yog perpendicular rau ib leeg, thiab ob qho tib si yog perpendicular rau cov kev taw qhia ntawm electromagnetic yoj propagation.
3) Qhov chaw deb yog qhov chaw tsis muaj zog, thiab nws qhov kev siv hluav taws xob electromagnetic yog me me.
