Nyob rau hauv qhov tsis muaj dielectric, qhov poob ntawm lub zog yuav tsis tshwm sim. Yog li lub attenuation yuav be zero.
Dab tsi yog qhov poob tsis muaj dielectric?
Ib qhov nruab nrab lossless yog a nruab nrab nrog xoom conductivity thiab finite permeability thiab permittivity. Thaum lub electromagnetic yoj propagates los ntawm ib tug lossless nruab nrab, lub amplitude ntawm nws hluav taws xob teb los yog magnetic teb tseem nyob tas mus li thoob plaws hauv lub propagation.
Yuav ua li cas yog ib tug lossy dielectric sawv cev?
Ib qhov nruab nrab dielectric yog txhais tau tias yog qhov nruab nrab uas cov hluav taws xob conductivity tsis sib npaug rau xoom tsis tau nws tsis yog tus neeg xyuas pib zoo. Kev teeb tsa σ ≠ 0 hauv Equation 1.12 ua rau tsis muaj xoom attenuation tas li (α ≠ 0).
Dab tsi yog qhov sib txawv ntawm qhov tsis muaj qhov tsis zoo thiab tsis muaj hluav taws xob?
Ib lub dielectric poob yog qhov nruab nrab uas EM nthwv dej poob lub zog thaum nws nthuav tawm vim qhov tsis zoo. Nyob rau hauv lwm yam lus, ib tug lossy dielectric yog ib feem ntawm qhov nruab nrab (iperfect dielectric los yog imperfect conductor) nrog ib tug =0, raws li txawv los ntawm ib tug lossless dielectric (zoo meej los yog zoo dielectric) nyob rau hauv uas a=0.
Dab tsi yog qhov poob tangent hauv electromagnetic theory?
Kev piav qhia: Qhov poob tangent yog ntsuas qhov poob ntawm lub zog vim kev nthuav tawm hauv dielectric, thaum piv rau hauv tus neeg xyuas pib. Li no nws kuj tseem hu ua dissipation factor.
