Xya Performance Indicators ntawm RF Connectors
Kabasi connectorengineers taw qhia tias qhov kev ua tau zoo ntawm RF connector muaj cov yam ntxwv impedance, reflection coefficient, voltage sawv yoj piv, insertion poob, thib peb-order intermodulation, cutoff zaus, dielectric tas li xya yam, cov ntsiab lus yog raws li nram no:
1. Yam ntxwv impedance:los ntawm lub capacitance thiab inductance ntawm cov kab sib txuas los txiav txim siab cov yam ntxwv ntawm cov kab sib txuas, qhia txog kev faib hluav taws xob thiab sib nqus hauv cov kab sib txuas, tsuav yog qhov nruab nrab ntawm cov kab sib kis tsis sib xws, cov yam ntxwv impedance yog qhov tsis tu ncua. . Nyob rau hauv lub coaxial cable los yog coaxial connector, tus yam ntxwv impedance yog txiav txim los ntawm lub puab txoj kab uas hla ntawm lub sab nrauv conductor, lub sab txoj kab uas hla ntawm lub puab conductor thiab lub dielectric tas li ntawm nruab nrab ntawm lub puab thiab sab conductors, nrog rau cov nram qab no ntau yam kev sib raug zoo.
2. Reflective coefficient:qhov piv ntawm qhov cuam tshuam qhov hluav taws xob rau qhov hluav taws xob input, qhov me dua tus nqi txhais tau hais tias lub zog tsawg dua, qhov kev sib tw zoo dua, qhov ze dua tus yam ntxwv impedance, qhov zoo dua qhov txuas ntxiv.
3. Voltage sawv wave ratio:qhov sib piv ntawm cov input voltage thiab reflected voltage thiab qhov sib txawv ntawm input voltage thiab reflected voltage, qhov no tus nqi yog ntau tshaj los yog sib npaug rau 1, qhov me dua qhov zoo dua, thiab lub reflection coefficient muaj ib co kev sib raug zoo.
4. Insertion poob:yog hais txog thaum ib qho kev tivthaiv lossis lub kaw lus tso rau hauv ib lub voj voog txuas nrog lub voj voog kom tsim hluav taws xob poob, lub zog poob rau cov khoom siv lossis qhov system ntxig poob, feem ntau hauv dB.
5. Qhov thib peb-order intermodulation:passive Cheebtsam (xws li connectors) tsim los ntawm non-linear ob los yog ntau zaus ntawm lub suab nrov. Cov yam uas ua rau kev txiav txim thib peb yog qhov nyuaj dua thiab yuav tsum muaj kev tsim qauv thiab kev tsim khoom los txo lossis tiv thaiv.
6. Kev txiav tawm zaus:Thaum lub electromagnetic yoj zaus siab dhau lawm (wavelength luv dhau), coaxial cable los yog coaxial connector media qhov chaw loj (kwv yees rau lub wavelength) kom lub electromagnetic yoj tsis tuaj yeem TEM (electromagnetic yoj propagation direction, hluav taws xob kev taw qhia, sib nqus. teb kev taw qhia 3 perpendicular rau ib leeg) txoj kev zaus ntawm propagation, coaxial cable los yog coaxial connector txheej conductor nyob rau hauv txoj kab uas hla, lub me me lub sab nraud txoj kab uas hla ntawm lub puab conductor, lub siab dua qhov kev txiav tawm zaus.
7. Dielectric tsis tu ncua:siv los ntsuas qhov kev ua tau zoo ntawm cov insulator los khaws cov hluav taws xob hluav taws xob, uas sawv cev rau qib ntawm polarization ntawm dielectric, uas yog, muaj peev xwm los khi tus nqi, qhov loj dua qhov dielectric tas li, muaj zog muaj peev xwm khi tus nqi. Dielectric nyob rau hauv daim ntawv thov hluav taws xob yuav tsim induced nqi thiab tsis muaj zog ntawm hluav taws xob teb, thawj daim ntawv thov hluav taws xob teb (hauv lub tshuab nqus tsev) thiab qhov kawg nruab nrab ntawm qhov hluav taws xob teb piv yog qhov dielectric tas li (permittivity), tseem hu ua tus nqi induction lossis txheeb ze capacitance tus nqi. Yog tias cov khoom siv nrog lub siab dielectric tas li yog muab tso rau hauv qhov hluav taws xob, lub zog ntawm daim teb yuav muaj qhov txo qis hauv dielectric. Lub capacitance ntawm lub phaj capacitive ua ε lub sij hawm loj dua tom qab sau nws nrog cov khoom siv nrog dielectric tas li ntawm ε. Dielectrics muaj cov cuab yeej ua kom qhov chaw loj dua lossis me dua qhov loj me. Piv txwv li, thaum cov khoom siv dielectric muab tso rau ntawm ob qhov nqi, nws txo qis kev quab yuam ntawm lawv, zoo li lawv tau txav mus deb dua. Thaum lub electromagnetic yoj mus los ntawm ib tug dielectric, qhov ceev ntawm nthwv dej yuav txo tau thiab muaj ib tug luv wavelength. Lub dielectric qhov tsis tu ncua ntawm cov khoom siv rwb thaiv tsev feem ntau siv rau cov khoom sib txuas yog feem ntau ntawm 2-5, xws li Teflon yog 2.1, FR4 yog 4.6.
