Intambo ye-coaxial isetyenziselwa ukudlulisa amandla e-RF ukusuka kwelinye izibuko okanye icandelo ukuya kwezinye iizibuko/iinxalenye zenkqubo. Intambo ye-coaxial eqhelekileyo isetyenziswa njengomgca we-microwave coaxial. Olu hlobo lwentambo ludla ngokuba nee-conductors ezimbini ezikwimo ye-cylindrical ezijikeleze i-axis efanayo. Zonke zahlulwe zizinto ze-dielectric. Kwii-frequency eziphantsi, ifom ye-polyethylene isetyenziswa njenge-dielectric, kwaye kwii-frequency eziphezulu kusetyenziswa izinto ze-Teflon.
Uhlobo lwentambo ye-coaxial
Kukho iintlobo ezininzi zentambo ye-coaxial kuxhomekeke kulwakhiwo lwe-conductor kunye neendlela zokukhusela ezisetyenzisiweyo. Iintlobo zentambo ye-coaxial ziquka intambo ye-coaxial eqhelekileyo njengoko kuchaziwe apha ngasentla kunye nentambo ye-coaxial egcwele igesi, intambo ye-coaxial edibeneyo, kunye nentambo ye-coaxial ekhuselweyo ye-bi-wire.
Iintambo ze-coaxial eziguquguqukayo zisetyenziswa kusasazo lukamabonwakude ezifumana ii-antenna ezinee-conductors zangaphandle ezenziwe nge-foil okanye i-braid.
Kwi-microwave frequency, umqhubi wangaphandle uqinile kwaye i-dielectric iya kuba yomelele. Kwiintambo ze-coaxial ezizaliswe yigesi, umqhubi osembindini wenziwe nge-insulator encinci ye-ceramic, esebenzisa i-polytetrafluoroethylene. I-nitrogen eyomileyo ingasetyenziswa njengesixhobo se-dielectric.
Kwi-coax edibeneyo, i-insulator yangaphakathi iphakanyiswa ijikeleze umqhubi wangaphakathi, ijikeleze umqhubi okhuselekileyo kwaye ijikeleze esi sigqubuthelo sokukhusela esikhuselayo.
Kwintambo ye-coaxial ekhuselwe kabini, iileya ezimbini zokhuseleko zihlala zibonelelwa ngokubonelela ngekhaka langaphakathi kunye nekhaka langaphandle. Oku kukhusela isignali kwi-EMI kunye nayo nayiphi na imitha evela kwintambo echaphazela iinkqubo ezikufutshane.
Impedance yempawu yomgca we-coaxial
I-impedance yempawu yekhebula le-coaxial elisisiseko ingamiselwa kusetyenziswa le fomyula ilandelayo.
Zo = 138/sqrt(K) * Ilog(D/d) Ohms
ngaphakathi,
I-K yi-dielectric constant ye-insulator phakathi kwee-conductors zangaphakathi nezangaphandle. I-D yi-diameter ye-conductor yangaphandle kwaye i-d yi-diameter ye-conductor yangaphakathi.
Iingenelo okanye iingenelo zeCoaxial Cable
Nazi ezinye zezona zibonelelo zentambo ye-coaxial:
➨Ngenxa yempembelelo yesikhumba, iintambo ze-coaxial ezisetyenziswa kwizicelo ze-frequency ephezulu (>50 MHz) zisebenzisa i-copper cladding ye-center conductor. Impembelelo yesikhumba sisiphumo semiqondiso ye-frequency ephezulu esasazeka kumphezulu wangaphandle we-conductor. Yonyusa amandla okuxinana kwentambo kwaye inciphise ubunzima.
➨Intambo yeCoaxial ibiza kancinci.
➨I-conductor yangaphandle kwi-coaxial cable isetyenziselwa ukuphucula ukuthomalalisa kunye nokukhusela. Oku kwenziwa ngokusebenzisa i-foil yesibini okanye i-braid ebizwa ngokuba yi-sheath (echazwe njenge-C2 kuMfanekiso 1). Ijakethi isebenza njengesikhuselo sokusingqongileyo kwaye yenziwe kwi-coaxial cable edibeneyo njengesithinteli-langatye.
➨Ayichaphazeleki lula yingxolo okanye ukuphazamiseka (i-EMI okanye i-RFI) kuneentambo ezijijekileyo zokubhangqa.
➨Xa ithelekiswa nesibini esijijekileyo, ixhasa ukuhanjiswa kwesignali ye-bandwidth ephezulu.
➨Kulula ukuyixhuma nokwandisa ngenxa yokuguquguquka.
➨Ivumela isantya esiphezulu sokudluliselwa, intambo ye-coaxial inezixhobo zokukhusela ezingcono.
Iingxaki okanye iiNgxaki zeCoaxial Cable
Nazi iingxaki zentambo ye-coaxial:
➨Ubukhulu obukhulu.
➨Ukufakela umgama omde kuyabiza ngenxa yobukhulu nokuqina kwayo.
➨Ekubeni intambo enye isetyenziselwa ukudlulisa imiqondiso kuyo yonke inethiwekhi, ukuba intambo enye ayisebenzi, yonke inethiwekhi iya kuwa.
➨Ukhuseleko luyinto exhalabisayo kakhulu kuba kulula ukuliva ikhebula le-coaxial ngokuliqhekeza uze ufake i-T-connector (uhlobo lwe-BNC) phakathi kwezi zimbini.
➨Kufuneka ibekwe phantsi ukuze kuthintelwe ukuphazamiseka.
Ixesha lokuthumela: Disemba-15-2023
