Qhov sib txawv tseem ceeb ntawm thaj chaw ze thiab thaj chaw deb yog thaj chaw ze yog thaj chaw uas nyob ze ntawm lub kav hlau txais xov lossis cov khoom tawg paj qhov chaw nyob deb yog thaj chaw uas nyob deb ntawm lub kav hlau txais xov lossis cov khoom tawg.
Peb tuaj yeem txhais qhov ze thaj tsam thiab thaj chaw deb li thaj tsam ntawm thaj chaw electromagnetic nyob ib puag ncig ib puag ncig, piv txwv li. kis tau tus kav hlau txais xov lossis qhov tshwm sim ntawm cov hluav taws xob tawg tawm ntawm ib qho khoom. Peb tuaj yeem soj ntsuam kev coj tus cwj pwm nyob ze ze ntawm lub kav hlau txais xov lossis cov khoom tawg, thaum qhov kev coj tus cwj pwm nyob deb yog muaj nyob deb ntawm qhov khoom.
Nyob ze qhov twg?
Neeg teb yog thaj av uas ze dua rau lub kav hlau txais xov lossis cov khoom tawg. Cov cheeb tsam no yog tswj hwm los ntawm ntau hom teb thiab peb tuaj yeem xav tias nws yog ib qho kev sau ntawm dipoles uas muaj kev sib raug zoo ntawm theem. Tus ciam teb ntawm thaj av ze thiab thaj chaw deb nyob ntawm qhov tseem ceeb wavelength uas tau tawm los ntawm qhov chaw thiab ntawm qhov loj ntawm cov khoom tawg.
Nyob rau hauv hom cheeb tsam no nyob ze ntawm lub kav hlau txais xov, nqus cov hluav taws xob cuam tshuam rau cov khoom thauj khoom; Raws li ib qho piv txwv yooj yim, peb tuaj yeem qhia qhov sib nqus induction uas yog tsim nyob rau hauv lub transformer. Tsis tas li ntawd, nyob rau hauv cov cheeb tsam no, cov hluav taws xob thiab cov hlau nplaum sib nqus zoo li muaj kev ywj pheej ntawm ib leeg, thiab ib thaj chaw tuaj yeem tswj hwm lwm hom teb.
Dab tsi yog Far Field?
Far-field yog thaj av uas tshwm sim ntawm qhov deb ntawm lub kav hlau txais xov lossis cov khoom tawg. Nws yog thaj av uas qhov chaw ua haujlwm zoo li qub txog hluav taws xob electromagnetic. Lub cheeb tsam no yog dominated los ntawm ib tug hluav taws xob los yog magnetic teb uas muaj hluav taws xob dipole yam ntxwv.
Nyob rau hauv hom cheeb tsam no, lub zog hluav taws xob zoo li txo qis nrog cov square ntawm qhov kev ncua deb, thiab qhov nqus ntawm qhov sib piv tsis pub rov qab mus rau lub transmitter. Tsis tas li ntawd, txhua qhov ntawm cov hluav taws xob hluav taws xob zoo li yuav raug tsim los ntawm kev hloov pauv ntawm lwm qhov, thaum qhov piv ntawm cov hluav taws xob thiab cov hlau nplaum sib nqus siv qhov tseem ceeb tuaj yeem muab tau yooj yim raws li yoj impedance.
Dab tsi yog qhov txawv ntawm thaj tsam ze thiab thaj teb deb?
Peb tuaj yeem txhais thaj tsam ze thiab thaj tsam deb li thaj tsam ntawm thaj chaw electromagnetic nyob ib puag ncig ib puag ncig, e.g. kis tau tus kav hlau txais xov los yog qhov tshwm sim ntawm hluav taws xob tawg tawm ntawm ib qho khoom. Qhov sib txawv tseem ceeb ntawm thaj chaw ze thiab thaj chaw deb yog thaj tsam ze yog thaj chaw uas nyob ze ntawm lub kav hlau txais xov lossis cov khoom tawg paj qhov chaw nyob deb yog thaj tsam uas tshwm sim nyob deb ntawm lub kav hlau txais xov lossis cov khoom tawg. Tsis tas li ntawd, nyob rau thaj tsam ze, qhov nqus ntawm cov hluav taws xob cuam tshuam rau lub nra ntawm lub transmitter thaum nyob deb, qhov nqus los yog hluav taws xob tsis cuam tshuam rau lub transmitter.
Cov infographic hauv qab no qhia qhov sib txawv ntawm thaj chaw ze thiab thaj chaw deb hauv daim ntawv teev npe rau kev sib piv ntawm ib sab.
Summary – Ze Field vs Far Field
Peb tuaj yeem txhais thaj tsam ze thiab thaj tsam deb li thaj tsam ntawm thaj chaw electromagnetic nyob ib puag ncig ib puag ncig, piv txwv li. kis tau tus kav hlau txais xov los yog qhov tshwm sim ntawm hluav taws xob tawg tawm ntawm ib qho khoom. Qhov sib txawv tseem ceeb ntawm thaj chaw ze thiab thaj chaw deb yog thaj tsam ze yog thaj chaw uas nyob ze ntawm lub kav hlau txais xov lossis cov khoom tawg, qhov chaw deb yog thaj tsam uas tshwm sim ntawm qhov deb ntawm lub kav hlau txais xov lossis cov khoom tawg.
