Ikhebula le-coaxial lisetshenziselwa ukudlulisa amandla e-RF kusuka kwelinye ichweba noma ingxenye liye kwamanye amachweba/izingxenye zesistimu. Ikhebula le-coaxial elijwayelekile lisetshenziswa njengomugqa we-microwave coaxial. Lolu hlobo lwentambo luvame ukuba nama-conductor amabili ngesimo se-cylindrical azungeze i-axis evamile. Wonke ahlukaniswe ngezinto ze-dielectric. Emafrikhwensini aphansi, ifomu le-polyethylene lisetshenziswa njenge-dielectric, kanti emafrikhwensini aphezulu kusetshenziswa izinto ze-Teflon.
Uhlobo lwekhebula le-coaxial
Kunezinhlobo eziningi zekhebula le-coaxial kuye ngokwakhiwa kwe-conductor kanye nezindlela zokuvikela ezisetshenziswayo. Izinhlobo zekhebula le-coaxial zifaka ikhebula le-coaxial elijwayelekile njengoba kuchaziwe ngenhla kanye nekhebula le-coaxial eligcwele igesi, ikhebula le-coaxial elihlanganisiwe, kanye nekhebula le-coaxial elivikelwe ngezintambo ezimbili.
Izintambo ze-coaxial eziguquguqukayo zisetshenziswa ekusakazweni kwethelevishini ama-antenna amukelayo anama-conductor angaphandle enziwe nge-foil noma i-braid.
Emazameni e-microwave, umqhubi wangaphandle uqinile futhi i-dielectric izoqina. Ezintanjeni ze-coaxial ezigcwele igesi, umqhubi ophakathi wenziwe nge-insulator encane ye-ceramic, esebenzisa ne-polytetrafluoroethylene. I-nitrogen eyomile ingasetshenziswa njengento ye-dielectric.
Ku-coax ehlanganisiwe, isivikelo sangaphakathi siphakanyiswa sizungeze umqhubi wangaphakathi, sizungeze umqhubi ovikelwe futhi sizungeze lesi sivikelo sokuvikela.
Kukhebula le-coaxial elivikelwe kabili, izendlalelo ezimbili zokuvikela zivame ukuhlinzekwa ngokuhlinzeka ngesivikelo sangaphakathi nesivikelo sangaphandle. Lokhu kuvikela isignali ku-EMI nanoma yimiphi imisebe evela kukhebula ethinta izinhlelo eziseduze.
Impedance yesici somugqa we-Coaxial
I-impedance yesici sekhebula le-coaxial eliyisisekelo inganqunywa kusetshenziswa ifomula elandelayo.
Zo = 138/sqrt(K) * Ilogi(D/d) Ohms
ku,
I-K iyi-dielectric constant ye-insulator phakathi kwabaqhubi bangaphakathi nabangaphandle. I-D iyi-diameter ye-conductor yangaphandle kanye ne-d iyi-diameter ye-conductor yangaphakathi.
Izinzuzo noma Izinzuzo ze-Coaxial Cable
Okulandelayo izinzuzo noma izinzuzo zekhebula le-coaxial:
➨Ngenxa yomphumela wesikhumba, izintambo ze-coaxial ezisetshenziswa ekusetshenzisweni kwemvamisa ephezulu (>50 MHz) zisebenzisa i-copper cladding yomqhubi ophakathi. Umphumela wesikhumba uwumphumela wezimpawu zemvamisa ephezulu ezisakazeka ebusweni bangaphandle bomqhubi. Kwandisa amandla okudonsa ekhebula futhi kunciphisa isisindo.
➨Ikhebula le-coaxial libiza kancane.
➨I-conductor yangaphandle kukhebula le-coaxial isetshenziselwa ukuthuthukisa ukuncipha kanye nokuvikela. Lokhu kufezwa ngokusebenzisa i-foil yesibili noma i-braid ebizwa ngokuthi i-sheath (ekhonjiswe ku-C2 kuMfanekiso 1). Ijakethi isebenza njengesivikelo semvelo futhi yenziwe ibe yikhebula le-coaxial elihlanganisiwe njengesivikelo somlilo.
➨Ayithinteki kalula umsindo noma ukuphazamiseka (i-EMI noma i-RFI) kunezintambo zokubhanqa ezisontekile.
➨Uma iqhathaniswa nepheya elisontekile, isekela ukudluliswa kwesignali ye-bandwidth ephezulu.
➨Kulula ukuyifaka ucingo futhi uyinwebe ngenxa yokuguquguquka.
➨Ivumela izinga eliphezulu lokudlulisa, ikhebula le-coaxial linezinto zokuvikela ezingcono.
Izinkinga noma Ukungalungi kwe-Coaxial Cable
Okulandelayo yizinkinga zekhebula le-coaxial:
➨Usayizi omkhulu.
➨Ukufakwa ibanga elide kuyabiza ngenxa yobukhulu nokuqina kwayo.
➨Njengoba ikhebula elilodwa lisetshenziswa ukudlulisa amasignali kuyo yonke inethiwekhi, uma ikhebula elilodwa lihluleka, yonke inethiwekhi izophela.
➨Ukuphepha kuyinkinga enkulu njengoba kulula ukulalela ikhebula le-coaxial ngokuliphula bese ufaka isixhumi se-T (uhlobo lwe-BNC) phakathi kwalokhu okubili.
➨Kumele kubekwe phansi ukuze kuvinjelwe ukuphazamiseka.
Isikhathi sokuthunyelwe: Disemba 15-2023
