duab 1
1. Beam efficiency
Lwm qhov tsis zoo rau kev ntsuas qhov zoo ntawm kev xa thiab txais cov kav hlau txais xov yog beam efficiency. Rau lub kav hlau txais xov nrog lub ntsiab lobe nyob rau hauv lub z-axis kev taw qhia raws li qhia nyob rau hauv daim duab 1, beam efficiency (BE) yog txhais raws li:
Nws yog qhov piv ntawm lub hwj chim kis los yog tau txais nyob rau hauv lub khob hliav qab lub kaum sab xis θ1 mus rau tag nrho lub hwj chim kis los yog tau txais los ntawm lub kav hlau txais xov. Cov qauv saum toj no tuaj yeem sau ua:
Yog hais tias lub kaum sab xis ntawm tus thawj xoom point los yog qhov tsawg kawg nkaus tus nqi tshwm yog xaiv raws li θ1, lub beam efficiency sawv cev rau tus piv ntawm lub hwj chim nyob rau hauv lub ntsiab lobe rau tag nrho cov hwj chim. Hauv kev siv xws li metrology, astronomy, thiab radar, tus kav hlau txais xov yuav tsum muaj lub teeb pom kev zoo heev. Feem ntau yuav tsum muaj ntau tshaj 90%, thiab lub zog tau txais los ntawm sab lobe yuav tsum me me li sai tau.
2. Bandwidth
Lub bandwidth ntawm tus kav hlau txais xov yog txhais tias "qhov ntau zaus uas qhov kev ua tau zoo ntawm qee yam ntawm tus kav hlau txais xov ua tau raws li cov qauv tshwj xeeb". Lub bandwidth tuaj yeem suav hais tias yog qhov ntau zaus ntawm ob sab ntawm qhov nruab nrab zaus (feem ntau xa mus rau qhov zaus resonant) qhov twg cov yam ntxwv ntawm tus kav hlau txais xov (xws li input impedance, directional pattern, beamwidth, polarization, sidelobe level, nce, beam pointing, radiation. efficiency) yog nyob rau hauv qhov kev siv tau tom qab muab piv rau tus nqi ntawm qhov chaw zaus.
. Rau broadband kav hlau txais xov, lub bandwidth feem ntau yog qhia raws li qhov piv ntawm lub sab sauv thiab qis zaus rau kev siv tau. Piv txwv li, bandwidth ntawm 10: 1 txhais tau hais tias qhov zaus siab tshaj yog 10 npaug ntawm qhov qis dua.
. Rau cov kav hlau txais xov nqaim bandwidth yog qhia raws li feem pua ntawm qhov sib txawv zaus rau qhov chaw nruab nrab. Piv txwv li, 5% bandwidth txhais tau hais tias qhov siv tau ntau zaus yog 5% ntawm qhov nruab nrab zaus.
Vim hais tias cov yam ntxwv ntawm tus kav hlau txais xov (input impedance, directional qauv, nce, polarization, thiab lwm yam) sib txawv nrog zaus, bandwidth yam ntxwv tsis txawv. Feem ntau qhov kev hloov pauv ntawm cov qauv coj thiab cov tswv yim impedance txawv. Yog li ntawd, cov qauv qhia kev taw qhia bandwidth thiab impedance bandwidth yuav tsum tau hais txog qhov sib txawv no. Cov qauv kev taw qhia bandwidth muaj feem xyuam rau qhov nce, qib sidelobe, beamwidth, polarization thiab beam kev taw qhia, thaum lub input impedance thiab hluav taws xob efficiency muaj feem xyuam rau impedance bandwidth. Bandwidth feem ntau teev nyob rau hauv cov nqe lus ntawm beamwidth, sidelobe theem, thiab cov yam ntxwv qauv.
Cov kev sib tham saum toj no xav tias qhov ntev ntawm qhov sib txuas network (transformer, counterpoise, thiab lwm yam) thiab / lossis kav hlau txais xov tsis hloov pauv txhua txoj hauv kev raws li qhov zaus hloov pauv. Yog tias qhov loj me ntawm cov kav hlau txais xov thiab / lossis cov txuas txuas txuas tuaj yeem hloov kho kom raug raws li qhov hloov pauv zaus, qhov bandwidth ntawm lub kav hlau txais xov nqaim tuaj yeem nce ntxiv. Thaum qhov no tsis yog ib txoj haujlwm yooj yim feem ntau, muaj cov ntawv thov uas nws ua tiav. Feem ntau cov piv txwv yog lub kav hlau txais xov xov tooj cua hauv lub tsheb xov tooj cua, uas feem ntau muaj qhov hloov tau ntev uas tuaj yeem siv los kho lub kav hlau txais xov kom zoo dua.
Yog xav paub ntxiv txog antennas, thov mus saib:
Post lub sij hawm: Lub Xya hli ntuj-12-2024
