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Atenuateur frekans radyo se yon enstriman trè enpòtan yo itilize nan teknoloji mikwo ond. Nan anpil sistèm mikwo ond, tankou rada, sistèm kominikasyon milti-chanèl ak lòt pèt transmisyon pouvwa ak resevwa mezi siyal, atenuateur RF yo inséparabl. Sansiblite ak presizyon mezi atenuateur RF yo pre relasyon ak pwodiksyon lis ekipman mikwo ond lan. Devlopman nan eleman yo, sistèm tès ak teknoloji tès nan konpayi an se inséparabl soti nan atenuateur a frekans radyo. Se mezi a nan atenuateur a frekans radyo pre relasyon ak etablisman an nan pouvwa mikwo ond, detèminasyon an nan estanda bri ak presizyon nan koreksyon atenuasyon.
Entwodiksyon kout nan atenuateur RF
Atenuateur pouvwa RF yo lajman ki itilize nan mezi enstriman elektwonik, tès konpatibilite elektwomayetik, ak atenuasyon andedan enstriman mezi, elatriye pèfòmans yo dirèkteman afekte presizyon nan tès la ak presizyon nan enstriman an mezire. Se poutèt sa, desine yon atenuateur pouvwa egzak ak ekselan RF se nan gwo siyifikasyon mezi radyo.
Fòm sikwi atenuateur frekans radyo
Atenuateur pouvwa RF jeneralman itilize eleman reziste, e gen de fòm sikwi prensipal: π-tip ak T-kalite
Pou atenuateur pouvwa RF, jeneralman pa gen okenn bezwen pou konvèsyon enpedans, se sa ki: enpedans nan opinyon ak enpedans pwodiksyon yo egal, ak kous la se simetrik, kidonk si li se yon sikwi π-kalite oswa yon sikwi T-kalite, R2 ak R3 gen menm valè rezistans lan.
RF atenuateur yon ti tan dekri kondisyon debaz yo
Atenuateur pouvwa RF la dwe swiv de prensip debaz sa yo:
1. matche enpedans
Atenuatè pouvwa RF la dwe gen enpedans matche avèk presizyon pou diminye pouvwa siyal la, sinon li pral fòme yon vag kanpe oswa refleksyon, ki pral afekte presizyon mezi a. Pou opinyon atenuatè a, enpedans opinyon an dwe matche ak enpedans pwodiksyon sous sous siyal la; pou pwodiksyon an atenuateur, enpedans pwodiksyon an dwe matche ak enpedans chaj la. Depi atenuatè pouvwa RF jeneralman pa bezwen fè transfòmasyon enpedans, enpedans opinyon, enpedans pwodiksyon, enpedans chaj ak enpedans pwodiksyon siyal sous yo tout egal.
2. Atenuasyon an satisfè kondisyon yo
Atenuasyon vòltaj 201gAt = 20lg (Vin / Vout) (dB) oswa atenuasyon pouvwa 101gAtp = 10lg (PIN / Pout) (dB) satisfè valè atenuasyon ki nesesè, paske pouvwa P = V² / R, depi enpedans D 'a egal a pwodiksyon enpedans, se konsa 10lgAtp = 10lg (PIN / Pout) = l0lg (Vin² / Vout²) = 20lg (nan / Vout) = 20lgAt, se konsa desibèl yo nan atenuasyon vòltaj (dB) yo konsistan avèk desibèl yo nan atenuasyon pouvwa (dB). Dapre desibèl la nan atenuasyon (dB), At miltip la nan atenuasyon vòltaj ka jwenn.
Konparezon nan atenuateur π-tip ak atenuateur T-kalite
Soti nan kalkil ki anwo a, li ka wè ke lè desibèl la nan atenuasyon se gwo, R1 pral piti anpil nan atenuateur a T-kalite. Akòz enfliyans nan jwenti yo plon ak soude, rezistans a twò piti asire presizyon li yo, ki afekte presizyon nan atenuasyon an. degre. Pou egzanp: lè D 'ak pwodiksyon enpedans la se 50Ω ak atenuasyon a se 60dB, R≈50.1Ω ak R1≈0.1Ω nan atenuateur a T-kalite, pandan y ap R≈49.9Ω ak R1≈25kΩ nan atenuateur a T-kalite. Se poutèt sa, sèvi ak li lè yon pi gwo atenuasyon obligatwa π-tip atenuateur se pi plis apwopriye, jeneral atenuasyon, π-kalite atenuateur ak T-kalite atenuateur yo apwopriye.
pou rezime
Ka atenuateur a dwe fòme nan yon koneksyon kaskad, epi yo ka kantite lajan an atenuasyon dwe chwazi nan yon switch oswa yon relè satisfè bezwen atenuasyon diferan. Atenuateur pouvwa RF la dwe pwoteje, epi yo dwe chwazi rezistans ki pa endiktif pou asire ke repons frekans lan satisfè kondisyon yo. Yo nan lòd yo kenbe tèt ak korespondan pouvwa a frekans radyo, pouvwa a rezistans nan atenuateur a dwe gen yon maj sèten.
lòt pwodwi nou an:
Antre nan imèl yo ka resevwa yon sipriz
es.fmuser.org
it.fmuser.org
fr.fmuser.org
de.fmuser.org
af.fmuser.org -> Afriken
sq.fmuser.org -> Albanyen
ar.fmuser.org -> Arab
hy.fmuser.org -> Armenian
az.fmuser.org -> Azerbaydjan
eu.fmuser.org -> Basque
be.fmuser.org -> Belarisyen
bg.fmuser.org -> Bulgarian
ca.fmuser.org -> Katalan
zh-CN.fmuser.org -> Chinwa (senplifye)
zh-TW.fmuser.org -> Chinwa (Tradisyonèl)
hr.fmuser.org -> Kwoasyen
cs.fmuser.org -> Czech
da.fmuser.org -> Danwa
nl.fmuser.org -> Olandè
et.fmuser.org -> Estonyen
tl.fmuser.org -> Filipino
fi.fmuser.org -> Finnish
fr.fmuser.org -> Franse
gl.fmuser.org -> Galisyen
ka.fmuser.org -> Georgian
de.fmuser.org -> Alman
el.fmuser.org -> Greek
ht.fmuser.org -> Kreyòl ayisyen
iw.fmuser.org -> ebre
hi.fmuser.org -> Hindi
hu.fmuser.org -> Hungarian
is.fmuser.org -> Icelandic
id.fmuser.org -> Endonezyen
ga.fmuser.org -> Ilandè
it.fmuser.org -> Italyen
ja.fmuser.org -> Japonè
ko.fmuser.org -> Koreyen
lv.fmuser.org -> Latvian
lt.fmuser.org -> Lithuanian
mk.fmuser.org -> Masedwan
ms.fmuser.org -> Malay
mt.fmuser.org -> Maltese
no.fmuser.org -> Norwegian
fa.fmuser.org -> Pèsik
pl.fmuser.org -> Polonè
pt.fmuser.org -> Pòtigè
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sv.fmuser.org -> Syèd
th.fmuser.org -> Thai
tr.fmuser.org -> Tik
uk.fmuser.org -> Ikrenyen
ur.fmuser.org -> Oudou
vi.fmuser.org -> Vietnamese
cy.fmuser.org -> Welsh
yi.fmuser.org -> Yiddish
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