Chingwe cha Coaxial chimagwiritsidwa ntchito kutumiza mphamvu ya RF kuchokera ku doko limodzi kapena gawo lina kupita ku madoko/zigawo zina za dongosolo. Chingwe chokhazikika cha coaxial chimagwiritsidwa ntchito ngati mzere wa coaxial wa microwave. Mtundu uwu wa waya nthawi zambiri umakhala ndi ma conductor awiri okhala ndi mawonekedwe a cylindrical kuzungulira mzere wofanana. Onse amalekanitsidwa ndi zinthu za dielectric. Pafupipafupi, mawonekedwe a polyethylene amagwiritsidwa ntchito ngati dielectric, ndipo pafupipafupi kwambiri zinthu za Teflon zimagwiritsidwa ntchito.
Mtundu wa chingwe cha coaxial
Pali mitundu yambiri ya zingwe za coaxial kutengera kapangidwe ka conductor ndi njira zotetezera zomwe zimagwiritsidwa ntchito. Mitundu ya zingwe za coaxial imaphatikizapo zingwe za coaxial zokhazikika monga tafotokozera pamwambapa komanso zingwe za coaxial zodzazidwa ndi mpweya, zingwe za coaxial zolumikizidwa, ndi zingwe za coaxial zotetezedwa ndi waya ziwiri.
Zingwe zosinthika za coaxial zimagwiritsidwa ntchito powulutsa wailesi yakanema kudzera mu ma antenna olandira ma antenna okhala ndi ma conductor akunja opangidwa ndi zojambulazo kapena kuluka.
Pa ma microwave frequency, kondakitala wakunja amakhala wolimba ndipo dielectric imakhala yolimba. Mu zingwe za coaxial zodzazidwa ndi mpweya, kondakitala wapakati amapangidwa ndi chotchingira cha ceramic chopyapyala, chomwe chimagwiritsanso ntchito polytetrafluoroethylene. Nayitrogeni wouma ungagwiritsidwe ntchito ngati chinthu cha dielectric.
Mu coax yolumikizidwa, chotetezera chamkati chimakwezedwa mozungulira kondakitala wamkati, mozungulira kondakitala wotetezedwa komanso mozungulira chidebe chotetezera ichi.
Mu chingwe cha coaxial chokhala ndi chitetezo chachiwiri, zigawo ziwiri za chitetezo nthawi zambiri zimaperekedwa popereka chishango chamkati ndi chakunja. Izi zimateteza chizindikiro ku EMI ndi kuwala kulikonse kuchokera ku chingwe chomwe chimakhudza machitidwe apafupi.
Mzere wa Coaxial umakhala ndi impedance yodziwika bwino
Kulephera kwa chingwe cha coaxial kumadziwika pogwiritsa ntchito njira yotsatirayi.
Zo = 138/sqrt(K) * Logi(D/d) Ohms
mu,
K ndiye chokhazikika cha dielectric cha insulator pakati pa ma conductor amkati ndi akunja. D ndiye m'mimba mwake mwa conductor wakunja ndipo d ndiye m'mimba mwake mwa conductor wamkati.
Ubwino kapena Ubwino wa Chingwe cha Coaxial
Ubwino kapena ubwino wa chingwe cha coaxial ndi awa:
➨Chifukwa cha mphamvu ya khungu, zingwe za coaxial zomwe zimagwiritsidwa ntchito pakugwiritsa ntchito ma frequency apamwamba (>50 MHz) zimagwiritsa ntchito mkuwa wa kondakitala wapakati. Mphamvu ya khungu imachokera ku zizindikiro zama frequency apamwamba zomwe zimafalikira pamwamba pa kondakitala. Zimawonjezera mphamvu yokoka ya chingwe ndikuchepetsa kulemera.
➨Chingwe cha Coaxial chimadula mtengo wotsika.
➨Chowongolera chakunja cha chingwe cha coaxial chimagwiritsidwa ntchito kukonza kufooka ndi kutchinga. Izi zimachitika pogwiritsa ntchito foil yachiwiri kapena braid yotchedwa sheath (yomwe ili mu Chithunzi 1). Jekete limagwira ntchito ngati chishango choteteza chilengedwe ndipo limapangidwa kukhala chingwe cha coaxial chofunikira ngati choletsa moto.
➨Sichikhudzidwa kwambiri ndi phokoso kapena kusokonezedwa (EMI kapena RFI) poyerekeza ndi zingwe zopindika.
➨Poyerekeza ndi awiri opindika, imathandizira kutumiza chizindikiro cha bandwidth yapamwamba.
➨Yosavuta kulumikiza waya ndi kukula chifukwa cha kusinthasintha.
➨Imalola kuti ma transmission azitha kufalikira mwachangu, chingwe cha coaxial chili ndi zinthu zotetezera bwino.
Zoyipa Kapena Zoyipa za Chingwe cha Coaxial
Zotsatirazi ndi zovuta za chingwe cha coaxial:
➨ Kukula kwakukulu.
➨Kuyika mtunda wautali kumadula chifukwa cha makulidwe ake komanso kulimba kwake.
➨Popeza chingwe chimodzi chimagwiritsidwa ntchito kutumiza zizindikiro mu netiweki yonse, ngati chingwe chimodzi chalephera, netiweki yonse idzazimiririka.
➨Chitetezo ndi vuto lalikulu chifukwa n'zosavuta kumvetsera chingwe cha coaxial pochiswa ndikuyika cholumikizira cha T (mtundu wa BNC) pakati pa ziwirizi.
➨Ayenera kukhazikika kuti apewe kusokoneza.
Nthawi yotumizira: Disembala-15-2023
