PIM, yomwe imadziwikanso kuti Passive Intermodulation, ndi mtundu wa kupotoza kwa ma sign.Popeza maukonde a LTE amakhudzidwa kwambiri ndi PIM, momwe mungazindikire ndikuchepetsa PIM yalandira chidwi chochulukirapo.
PIM imapangidwa ndi kusakanikirana kosagwirizana pakati pa ma frequency awiri kapena kupitilira apo, ndipo chizindikirocho chimakhala ndi ma frequency osafunikira kapena zinthu zophatikizira.Monga mawu oti "passive" m'dzina loti "passive intermodulation" amatanthauza chimodzimodzi, kusakanikirana kosagwirizana kotchulidwa pamwambapa komwe kumayambitsa PIM sikuphatikiza zida zogwira ntchito, koma nthawi zambiri kumapangidwa ndi zida zachitsulo ndi zida zolumikizidwa.Njira, kapena zigawo zina zomwe zili mu dongosolo.Zomwe zimayambitsa kusakanizikana kosagwirizana zingaphatikizepo izi:
• Zowonongeka pamalumikizidwe amagetsi: Popeza palibe malo osalala bwino padziko lapansi, pakhoza kukhala madera omwe ali ndi kachulukidwe kakang'ono kamakono m'malo olumikizana pakati pa malo osiyanasiyana.Zigawozi zimapanga kutentha chifukwa cha njira yochepa yopangira, zomwe zimapangitsa kusintha kwa kukana.Pachifukwa ichi, cholumikizira chiyenera kumangirizidwa molondola ku torque yomwe mukufuna.
• Pamalo ambiri azitsulo pali wosanjikiza umodzi wopyapyala wa okusayidi, womwe ungayambitse kuwongolera kwa tunnel kapena, mwachidule, kupangitsa kuchepa kwa malo oyendetsa.Anthu ena amaganiza kuti chodabwitsa ichi chikhoza kutulutsa zotsatira za Schottky.Ichi ndichifukwa chake mabawuti ochita dzimbiri kapena madenga achitsulo okhala ndi dzimbiri pafupi ndi nsanja yam'manja amatha kuyambitsa ma sign amphamvu a PIM.
• Zida za Ferromagnetic: Zida monga chitsulo zimatha kupanga kupotoza kwakukulu kwa PIM, kotero zinthu zoterezi siziyenera kugwiritsidwa ntchito pamakina am'manja.
Maukonde opanda zingwe akhala ovuta kwambiri monga machitidwe angapo ndi mibadwo yosiyanasiyana ya machitidwe ayamba kugwiritsidwa ntchito mkati mwa malo omwewo.Zizindikiro zosiyanasiyana zikaphatikizidwa, PIM, yomwe imayambitsa kusokoneza chizindikiro cha LTE, imapangidwa.Tinyanga, ma duplex, zingwe, zolumikizira zauve kapena zotayirira, ndi zida zowonongeka za RF ndi zinthu zachitsulo zomwe zili pafupi kapena mkati mwa siteshoni yam'manja zitha kukhala magwero a PIM.
Popeza kusokonezedwa kwa PIM kumatha kukhudza kwambiri magwiridwe antchito a LTE network, ogwiritsa ntchito opanda zingwe ndi makontrakitala amawona kufunikira kwakukulu kwa kuyeza kwa PIM, malo oyambira ndi kupondereza.Miyezo yovomerezeka ya PIM imasiyana malinga ndi dongosolo.Mwachitsanzo, zotsatira za mayeso a Anritsu zikuwonetsa kuti mulingo wa PIM ukakwera kuchokera ku -125dBm kupita ku -105dBm, liwiro lotsitsa limatsika ndi 18%, pomwe oyamba ndi omaliza Makhalidwe onsewa amawonedwa kuti ndi ovomerezeka a PIM.
Ndi mbali ziti zomwe ziyenera kuyesedwa za PIM?
Kawirikawiri, chigawo chilichonse chimayesedwa ndi PIM panthawi ya mapangidwe ndi kupanga kuti zitsimikizire kuti sizikhala gwero lalikulu la PIM pambuyo poika.Kuphatikiza apo, popeza kulondola kwa kulumikizana ndikofunikira pakuwongolera kwa PIM, kukhazikitsanso ndi gawo lofunikira pakuwongolera kwa PIM.Mu dongosolo la antenna logawidwa, nthawi zina zimakhala zofunikira kuyesa PIM pa dongosolo lonse komanso kuyesa PIM pa chigawo chilichonse.Masiku ano, anthu akuchulukirachulukira kugwiritsa ntchito zida zovomerezeka za PIM.Mwachitsanzo, tinyanga zomwe zili pansipa -150dBc zitha kuonedwa ngati kutsata kwa PIM, ndipo izi zikuchulukirachulukira.
Kuphatikiza pa izi, njira yosankha malo a malo am'manja, makamaka malo am'manja ndi antenna asanakhazikitsidwe, komanso gawo lotsatira loyika, limaphatikizaponso kuwunika kwa PIM.
Kingtone imapereka magulu otsika a PIM cable, zolumikizira, ma adapter, ophatikiza ma frequency angapo, ophatikiza ma co-frequency, duplexers, splitters, couplers ndi antennas kuti akwaniritse zofunikira zosiyanasiyana zokhudzana ndi PIM.
Nthawi yotumiza: Feb-02-2021