Joalo ka ha bohle re tseba, mohala oa coaxial ke mohala oa phetisetso ea Broadband o nang le tahlehelo e tlase le ho itšehla thajana.Mohala oa coaxial o na le li-concentric cylindrical conductors tse arohaneng ke likhase tsa dielectric.Capacitance le inductance ajoa hammoho le coaxial line tla hlahisa ajoa impedance ka sebopeho kaofela, e leng tšobotsi impedance.
Tahlehelo ea ho hanyetsa ka har'a thapo ea coaxial e etsa hore tahlehelo le boits'oaro bo haufi le thapo bo bonahale esale pele.Tlas'a phello e kopantsoeng ea lintlha tsena, tahlehelo ea thapo ea coaxial ha e fetisa matla a motlakase (EM) e tlase haholo ho feta ea antenna sebakeng sa mahala, mme tšitiso le eona e tlase.
(1) Sebopeho
Lihlahisoa tsa li-cable tsa coaxial li na le lera le sireletsang ka ntle la conductive.Likarolo tse ling tsa thepa li ka sebelisoa ka ntle ho thapo ea coaxial ho ntlafatsa ts'ebetso ea ts'ireletso ea tikoloho, bokhoni ba ho sireletsa EM le ho feto-fetoha ha maemo.Cable ea coaxial e ka etsoa ka terata e lohiloeng ea mokhanni, 'me e behiloe ka bohlale, e etsang hore thapo e tenyetsehe haholo, e be bonolo, e tšoarelle nako e telele.Hafeela mokhanni oa cylindrical oa thapo ea coaxial a boloka concentricity, ho khumama le ho kheloha ho ke ke ha ama ts'ebetso ea mohala.Ka hona, lithapo tsa coaxial hangata li hokahanngoa le likhokahano tsa coaxial li sebelisa mekhoa ea mofuta oa screw.Sebelisa wrench ea torque ho laola ho tiea.
2) Molao-motheo oa ts'ebetso
Li-coaxial line li na le litšobotsi tsa bohlokoa tse amanang le maqhubu, tse hlalosang ts'ebeliso ea tsona e ka bang botebo ba letlalo le maqhubu a khaotsoeng.Botebo ba letlalo bo hlalosa ts'ebetso ea matšoao a phahameng a maqhubu a phatlalatsoang ho latela mohala oa coaxial.Ha maqhubu a phahame, li-electrone tse ngata li atisa ho fallela sebakeng sa conductor sa mohala oa coaxial.Matla a letlalo a lebisa ho ho fokotseha ho hoholo le ho futhumala ha dielectric, ho etsa hore tahlehelo ea ho hanyetsa moleng oa coaxial e be kholoanyane.E le ho fokotsa tahlehelo e bakoang ke phello ea letlalo, cable ea coaxial e nang le bophara bo boholo e ka sebelisoa.
Ho hlakile hore ho ntlafatsa ts'ebetso ea thapo ea coaxial ke tharollo e khahlang haholoanyane, empa ho eketsa boholo ba thapo ea coaxial ho tla fokotsa maqhubu a mangata ao mohala oa coaxial o ka o fetisang.Ha bophahamo ba maqhubu a matla a EM bo feta mokhoa oa transverse electromagnetic (TEM) mme bo qala ho "bounce" haufi le mohala oa coaxial ho ea ho transverse electric 11 mode (TE11), ho tla hlahisoa maqhubu a ho khaola cable ea coaxial.Mokhoa ona o mocha oa maqhubu o tlisa mathata.Kaha mokhoa o mocha oa maqhubu o ata ka lebelo le fapaneng le mokhoa oa TEM, o tla bonahatsa le ho kena-kenana le letšoao la mokhoa oa TEM o fetisitsoeng ka mohala oa coaxial.
Ho rarolla bothata bona, re lokela ho fokotsa boholo ba thapo ea coaxial le ho eketsa maqhubu a khaotsoeng.Ho na le likhoele tsa coaxial le likhokahano tsa coaxial tse ka fihlelang maqhubu a maqhubu a millimeter - 1.85mm le 1mm coaxial likhokahanyo.Ke habohlokoa ho hlokomela hore ho fokotsa boholo ba 'mele ho ikamahanya le maqhubu a phahameng ho tla eketsa tahlehelo ea cable ea coaxial le ho fokotsa matla a ho sebetsa ha matla.Phephetso e 'ngoe ea ho etsa likarolo tsena tse nyane haholo ke ho laola ka tieo mamello ea mochini ho fokotsa mefokolo e kholo ea motlakase le liphetoho tsa impedance haufi le mohala.Bakeng sa likhoele tse nang le kutlo e batlang e phahame, ho tla bitsa chelete e ngata ho fihlela sena.
Nako ea poso: Jan-05-2023