Ka whakamahia te taura honohono hei tuku i te kaha RF mai i tētahi tauranga, wāhanga rānei ki ētahi atu tauranga/wāhanga o te pūnaha. Ka whakamahia te taura honohono paerewa hei aho honohono ngaruiti. Ko tēnei momo waea he tikanga he rua ngā kaiārahi he āhua porotaka huri noa i tētahi tuaka noa. Ka wehea katoatia ēnei e te rauemi dielectric. I ngā auau iti iho, ka whakamahia te momo polyethylene hei dielectric, ā, i ngā auau teitei ake ka whakamahia te rauemi Teflon.
Momo taura coaxial
He maha ngā momo taura honohono, kei runga i te hanganga o te ara iahiko me ngā tikanga tiaki i whakamahia. Ko ngā momo taura honohono ko te taura honohono paerewa e ai ki te whakaahuatanga i runga ake nei me te taura honohono kī tonu i te hau, te taura honohono honohono, me te taura honohono ārai-waea rua.
E whakamahia ana ngā taura coaxial ngāwari i roto i ngā pūihi whiwhi pāpāho pouaka whakaata he mea hanga ngā taura o waho ki te pepa konutea, ki te whiri rānei.
I ngā auau ngaruiti, he pakari te arataki o waho, ā, ka totoka te arataki hiko. I roto i ngā taura coaxial kua whakakiia ki te hau, he mea hanga te arataki o waenganui i te ārai uku angiangi, e whakamahi ana hoki i te polytetrafluoroethylene. Ka taea te whakamahi i te hauota maroke hei rauemi arataki hiko.
I roto i te coax honohono, ka whakaarahia te ārai o roto i te taha o te ara iahiko o roto, i te taha o te ara iahiko kua tiakina, me te taha hoki o tēnei hipoki ārai tiaki.
I roto i te taura coaxial takirua-parenga, e rua ngā paparanga tiaki e whakaratohia ana mā te whakarato i te parenga o roto me te parenga o waho. Mā tēnei ka tiakina te tohu mai i te EMI me tetahi irahiko mai i te taura e pā ana ki ngā pūnaha tata.
Ārai āhuatanga raina coaxial
Ka taea te whakatau i te ārai āhuatanga o tētahi taura coaxial taketake mā te whakamahi i te tātai e whai ake nei.
Zo = 138/sqrt(K) * Rangitaki(D/d) Ohms
i roto i,
Ko K te pūmau ārai hiko o te ārai i waenganui i ngā ara iahiko o roto, o waho hoki. Ko D te whānui o te ara iahiko o waho, ā, ko d te whānui o te ara iahiko o roto.
Ngā Painga, Ngā Painga rānei o te Taura Whakakotahi
Anei ngā painga, ngā painga rānei o te taura coaxial:
➨Nā te pānga kiri, ka whakamahia e ngā taura coaxial e whakamahia ana i roto i ngā tono auau teitei (>50 MHz) he whakakikorua parahi o te ara iahiko pokapū. Ko te pānga kiri te hua o ngā tohu auau teitei e horapa ana i te mata o waho o te ara iahiko. Ka whakanui ake i te kaha kume o te taura, ka whakaiti hoki i te taumaha.
➨He iti ake te utu o te taura coaxial.
➨Ka whakamahia te ara iahiko o waho o te taura honohono hei whakapai ake i te whakaiti me te ārai. Ka tutuki tēnei mā te whakamahi i tētahi atu pepa whakarewa, whiri rānei e kiia nei ko te whāriki (e kiia nei ko C2 i te Pikitia 1). Ka mahi te koti hei ārai taiao, ā, ka hangaia hei taura honohono whakauru hei ārai mura.
➨He iti ake te tūponotanga ki te haruru, ki te pokanoa rānei (EMI, RFI rānei) i ngā taura takirua miro.
➨Ki te whakatauritea ki te takirua miro, ka tautokohia e ia te tuku tohu whānui-rahi.
➨He māmā te hono me te whakawhanui nā te ngāwari.
➨Ka taea te tere tuku tere, he pai ake te rauemi tiaki o te taura coaxial.
Ngā Huakore, Ngā Huakore rānei o te Taura Whakakotahi
Ko ngā ngoikoretanga e whai ake nei o te taura coaxial:
➨Rahi nui.
➨He utu nui te tāutanga mai i tawhiti nā te matotoru me te pakari.
➨Nā te mea kotahi te taura e whakamahia ana hei tuku tohu puta noa i te whatunga, ki te pakaru tetahi taura, ka hinga te whatunga katoa.
He āwangawanga nui te haumarutanga nā te mea he ngāwari te whakarongo puku ki te taura coaxial mā te motu me te whakauru i tētahi hononga-T (momo BNC) ki waenganui i ngā taura e rua.
➨Me whakapūmau ki te whenua hei ārai i te pokanoa.
Wā tuku: Hakihea-15-2023
