Coaxial cable e sebelisetsoa ho fetisetsa matla a RF ho tloha koung e le 'ngoe kapa karolo ho ea likoung / likarolo tse ling tsa tsamaiso. Cable e tloaelehileng ea coaxial e sebelisoa e le mohala oa microwave coaxial. Mofuta ona oa terata hangata o na le li-conductors tse peli ka sebopeho sa cylindrical ho potoloha axis e tloaelehileng. Kaofela li arotsoe ka thepa ea dielectric. Libakeng tse tlase, ho sebelisoa mofuta oa polyethylene e le dielectric, 'me ka maqhubu a phahameng ho sebelisoa thepa ea Teflon.
Mofuta oa thapo ea coaxial
Ho na le mefuta e mengata ea thapo ea coaxial ho latela kaho ea conductor le mekhoa ea ho sireletsa e sebelisitsoeng. Mefuta ea li-coaxial cable e kenyelletsa thapo e tloaelehileng ea coaxial joalo ka ha e hlalositsoe ka holimo hammoho le thapo ea coaxial e tlatsitsoeng ka khase, thapo ea coaxial e kentsoeng, le thapo e sirelelitsoeng ea bi-wire shielded coaxial cable.
Lithapo tsa coaxial tse feto-fetohang li sebelisoa khasong ea thelevishene e amohelang li-antenna tse nang le li-conductors tsa ka ntle tse entsoeng ka foil kapa braid.
Ka maqhubu a microwave, conductor ea ka ntle e thata 'me dielectric e tla ba e tiileng. Ka lithapo tsa coaxial tse tletseng khase, mokhanni oa setsi o entsoe ka insulator e tšesaane ea ceramic, hape e sebelisa polytetrafluoroethylene. Naetrojene e omileng e ka sebelisoa joalo ka thepa ea dielectric.
Ka coax e hlalositsoeng, insulator e ka hare e phahamisoa ho pota-potile mokhanni oa ka hare. ho pota-pota sekontiri se sirelelitsoeng le ho pota-potile lesela lena le sireletsang le sireletsang.
Ka mohala oa coaxial o sirelelitsoeng habeli, mekhahlelo e 'meli ea tšireletso hangata e fanoa ka ho fana ka thebe e ka hare le thebe e kantle. Sena se sireletsa lets'oao ho EMI le mahlaseli afe kapa afe a tsoang ho thapo e amang lits'ebetso tse haufi.
Coaxial line tšobotsi impedance
Sebopeho sa impedance ea thapo ea coaxial ea mantlha e ka khethoa ka mokhoa o latelang.
Zo = 138/sqrt(K) * Log(D/d) Ohms
ka hare,
K ke "dielectric constant" ya insulator pakeng tsa li-conductor tse ka hare le tsa ka ntle. D ke bophara ba mokhanni oa ka ntle 'me d ke bophara ba mokhanni oa ka hare.
Melemo kapa Melemo ea Coaxial Cable
Tse latelang ke melemo kapa melemo ea coaxial cable:
➨Ka lebaka la phello ea letlalo, likhoele tsa coaxial tse sebelisoang lits'ebetsong tse phahameng tsa maqhubu (> 50 MHz) li sebelisa koporo ea mochini o bohareng. Phello ea letlalo ke phello ea lipontšo tse phahameng tsa maqhubu a phatlalatsoang haufi le bokantle ba ka ntle ba mokhanni. E eketsa matla a thapo ea thapo mme e fokotsa boima ba 'mele.
➨ Coaxial cable e bitsa tlase.
➨ Kondaktara ea ka ntle ho thapo ea coaxial e sebelisoa ho ntlafatsa ho fokotsa le ho sireletsa. Sena se finyelloa ka ho sebelisa foil ea bobeli kapa braid e bitsoang sheath (e khethiloeng C2 setšoantšong sa 1). Baki e sebetsa e le thebe ea tikoloho 'me e entsoe ka har'a thapo ea coaxial ea bohlokoa joalo ka ntho e thibelang lelakabe.
➨ Ha e kotsing ea ho ba le lerata kapa tšitiso (EMI kapa RFI) ho feta lithapo tse rothehileng tse tsamaisanang.
➨ Ha e bapisoa le para e sothehileng, e ts'ehetsa phetiso ea mats'oao a maqhubu a holimo.
➨Ho bonolo ho kenya terata le ho holisoa ka lebaka la ho tenyetseha.
➨E lumella sekhahla se phahameng sa phetisetso, thapo ea coaxial e na le lisebelisoa tse sireletsang hantle.
Melemo kapa Mefokolo ea Coaxial Cable
Lintlha tse latelang ke mefokolo ea coaxial cable:
➨ Boholo bo boholo.
➨ Ho kenya sebaka se selelele ho bitsa chelete e ngata ka lebaka la botenya le ho satalla ha eona.
➨ Kaha ho sebelisoa thapo e le 'ngoe ho fetisa matšoao ho pholletsa le marang-rang, haeba mohala o le mong o hlōleha, marang-rang kaofela a tla theoha.
➨Tsireletso ke ntho e tšoenyang haholo kaha ho bonolo ho mamela thapo ea coaxial ka ho e pshatla le ho kenya T-connector (mofuta oa BNC) pakeng tsa tse peli.
➨ E tlameha ho beoa motheong ho thibela tšitiso.
Nako ea poso: Dec-15-2023
