Qhov hluav taws xob teb zaus siv rau nruab nrab cua sov yog siab heev

Qhov hluav taws xob teb zaus siv rau nruab nrab cua sov yog siab heev

Siv high-frequency hluav taws xob teb rau tshav kub rwb thaiv tsev cov ntaub ntawv. Cov khoom cua kub tseem ceeb yog dielectric. Thaum lub dielectric muab tso rau hauv ib qho kev hloov hluav taws xob, nws yuav rov qab polarized (ib qho tshwm sim uas qhov sib npaug ntawm qhov sib npaug ntawm cov nqi hluav taws xob tshwm sim ntawm qhov chaw lossis sab hauv ntawm dielectric nyob rau hauv qhov kev txiav txim ntawm hluav taws xob teb), yog li hloov hluav taws xob hluav taws xob. nyob rau hauv hluav taws xob teb rau hauv thermal zog. Qhov hluav taws xob teb zaus siv rau nruab nrab cua sov yog siab heev. Nyob rau hauv nruab nrab, luv luv, thiab ultra luv yoj bands, zaus ntawm ob peb puas kHz mus rau 300 MHz yog hu ua high-frequency nruab nrab cua sov. Yog hais tias qhov zaus tshaj 300 MHz thiab ncav cuag lub microwave band, nws yog hu ua microwave nruab nrab cua sov. Feem ntau, high-frequency nruab nrab cua sov yog nqa tawm nyob rau hauv hluav taws xob teb ntawm ob daim hlau; Microwave nruab nrab cua sov yog nqa tawm nyob rau hauv cov hluav taws xob teb ntawm waveguides, resonant kab noj hniav, los yog microwave antennas. Thaum lub dielectric yog rhuab nyob rau hauv ib tug high-frequency hluav taws xob teb, lub zog hluav taws xob absorbed ib chav tsev ntim yog P=0.566fE ε RTG δ X 10 (watts/centimeter) Yog hais tias nyob rau hauv tshav kub, nws yog: H{{ 9}}.33fE ε RTG δ Hauv cov qauv x 10 (calories/second · centimeter), f yog qhov zaus ntawm qhov hluav taws xob ntau zaus, ε R yog tus txheeb ze dielectric qhov tsis tu ncua ntawm dielectric, δ Yog lub dielectric poob lub kaum ntse ntse , E yog lub zog hluav taws xob. Raws li cov qauv, lub zog absorbed los ntawm dielectric los ntawm ib tug high-frequency hluav taws xob teb yog lub square ntawm lub hluav taws xob teb zog E, zaus f ntawm lub hluav taws xob teb, thiab lub poob lub kaum sab xis ntawm lub dielectric δ Ncaj proportional. E thiab f yog txiav txim siab los ntawm daim ntawv thov hluav taws xob, thaum ε R nyob ntawm cov khoom ntawm dielectric nws tus kheej. Yog li cov khoom tseem ceeb ntawm cov cua sov nruab nrab yog cov khoom uas muaj kev poob siab nruab nrab. Cov cua kub nruab nrab ua kom muaj cua sov hauv cov dielectric (cov khoom siv cua sov), ua rau cov cua kub ceev ceev, thermal efficiency ntau dua, thiab cov cua sov ntau dua piv rau lwm cov cua sov sab nraud. Cov cua kub nruab nrab hauv kev lag luam tuaj yeem ua kom kub kub gel, qhuav nplej, ntawv, ntoo, thiab lwm yam ntaub ntawv fiber ntau; Nws tseem tuaj yeem ua kom sov cov yas ua ntej molding, nrog rau vulcanize roj hmab thiab daim ntawv cog lus ntoo, yas, thiab lwm yam. Xaiv qhov tsim nyog hluav taws xob zaus thiab cov cuab yeej tuaj yeem ua kom sov tsuas yog cov nplaum thaum cua sov lub plywood, tsis cuam tshuam rau lub plywood nws tus kheej. Rau cov ntaub ntawv homogeneous, tag nrho cov cua sov tuaj yeem ua tau.

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