Dab tsi parameter yuav tsum tau txiav txim siab thaum xaiv RF lim?

Thaum tsim cov tshuaj RF, RF cov ntxaij lim dej ua lub luag haujlwm tseem ceeb hauv lub cev. Yog tias xaiv RF lim, cov kev ntsuas hauv qab no yuav tsum tau txiav txim siab.

1. Center zaus: f0 yog luv luv rau qhov nruab nrab zaus ntawm passband ntawm RF lim, uas feem ntau yog coj li f0 = (fL + fH) / 2, thiab fL thiab fH yog cov ntsiab lus sab zaus ntawm tus txheeb ze 1dB lossis 3dB poob. los ntawm sab laug thiab sab xis ntawm band-pass lossis band-stop lim. Qhov hla-bandwidth ntawm cov lim nqa nqaim feem ntau yog xam los ntawm kev siv qhov tsawg kawg nkaus qhov poob raws li qhov nruab nrab zaus.

2. Cutoff Frequency: Rau qhov tsawg-pass lim, nws yog hais txog txoj cai zaus point ntawm passband, thiab rau high-pass lim, nws yog hais txog rau sab laug zaus point ntawm passband, uas feem ntau yog txhais nyob rau hauv cov nqe lus ntawm 1dB. los yog 3dB txheeb ze cov ntsiab lus poob. Kev siv rau cov txheeb ze poob yog raws li hauv qab no: rau qis dhau lim, qhov kev poob qis yog raws li DC, thiab rau cov lim siab dhau, qhov kev poob qis yog nyob ntawm qhov siab tshaj plaws-pass zaus yam tsis muaj spurious nres-band.

3. BWxdB: Hais txog qhov dav spectrum yuav hla, BWxdB = (fH-FL). fH thiab fL yog cov ntsiab lus ntawm sab laug thiab sab xis ntawm X (dB) qis dua raws li kev nkag mus ntawm qhov chaw zaus f0. X = 3, 1, 0.5, uas yog BW3dB, BW1dB, BW0.5dB, feem ntau yog siv los ua tus cwj pwm ntawm cov bandwidth ntawm lub lim. Fractional bandwidth = BW3dB / f0 × 100%, kuj tseem siv los ua tus cwj pwm hla-bandwidth ntawm lim.

 

1. Insertion Loss: Vim yog lub lim RF, thawj lub teeb liab hauv Circuit Court yog attenuated, nws poob yog yam ntxwv ntawm qhov chaw los yog txiav tawm zaus. Yog hais tias qhov yuav tsum tau ntawm tag nrho-band poob yuav tsum tau hais txog.

 

1. Ripple: Hais txog lub ncov-rau-nruab nrab ntawm kev nkag mus poob qhov hloov pauv nrog zaus raws li qhov kev poob qis hauv qhov ntau ntawm 1dB lossis 3dB bandwidth (kev txiav tawm zaus).

 

 

1. Passband Riplpe: Nws yog hais txog qhov kev hloov pauv ntawm qhov poob hauv qhov pass-band zaus. Qhov kev hloov pauv ntawm kev sib hloov hauv 1dB bandwidth yog 1dB.

 

1. VSWR: Nws yog ib qho tseem ceeb rau kev ntsuas seb lub teeb liab nyob rau hauv lub pass-band ntawm lub lim yog zoo sib xws thiab kis tau tus mob. VSWR = 1: 1 yog rau kev sib tw zoo tagnrho, VSWR> 1 yog rau kev tsis sib haum. Rau qhov tseeb RF lim, qhov bandwidth txaus siab VSWR < 1.5: 1 feem ntau tsawg dua BW3dB, thiab nws qhov kev faib ua feem rau BW3dB cuam tshuam nrog kev txiav txim lim dej thiab qhov poob.
2. Rov Los Loss: Nws hais txog qhov piv ntawm decibels (dB) ntawm lub zog nkag thiab lub zog ntawm lub teeb liab ntawm qhov chaw nres nkoj, uas yog sib npaug rau | 20Log10ρ|, ρis voltage reflection coefficient. Qhov rov qab poob yog infinite thaum lub zog input absorbed los ntawm qhov chaw nres nkoj.
3. Kev tsis lees paub nres: qhov ntsuas tseem ceeb los ntsuas qhov kev xaiv ntawm RF lim. Qhov siab dua qhov Performance index yog, qhov zoo dua qhov kev tawm tsam ntawm kev cuam tshuam tawm ntawm lub teeb liab. Feem ntau muaj ob txoj kev tsim tawm: ib qho yog nug ntau npaum li cas dB fs yog suppressed rau ib tug muab tawm-ntawm-band zaus, thiab cov txheej txheem xam yog lub attenuation as-il ntawm FS; Lwm qhov yog los tawm tswv yim rau qhov ntsuas qhov sib thooj ntawm qhov amplitude-frequency teb ntawm lub lim thiab cov duab plaub zoo tagnrho - duab plaub coefficient (KxdB> 1), KxdB = BWxdB / BW3dB, (X tuaj yeem yog 40dB, 30dB, 20 dB, thiab lwm yam). Qhov kev txiav txim ntau lub lim muaj, ntau lub duab plaub nws yog - uas yog, qhov ze K yog rau qhov zoo tagnrho tus nqi ntawm 1, qhov nyuaj dua nws yog ua.

 

Tau kawg, tshwj tsis yog cov ntsiab lus saum toj no, koj tuaj yeem xav txog nws lub zog ua haujlwm, kev ntsuas rau daim ntawv thov, lossis siv rau sab hauv lossis sab nraum zoov, nrog rau cov khoom sib txuas. Txawm li cas los xij, cov kev ntsuas saum toj no yog qhov tseem ceeb tshaj plaws los txiav txim siab nws qhov kev ua tau zoo.

Raws li tus tsim qauv ntawm RF lim, Jingxin tuaj yeem pab koj tawm ntawm qhov teeb meem ntawm RF lim, thiab kho cov lim lim raws li koj qhov kev daws teeb meem. Xav paub ntau ntxiv tuaj yeem sab laj nrog peb.