Zipangizo zogwira ntchito zimadziwika kuti zili ndi zotsatira zopanda malire pa dongosolo. Njira zosiyanasiyana zapangidwa kuti ziwongolere magwiridwe antchito a zida zotere panthawi ya mapangidwe ndi magwiridwe antchito. Ndizosavuta kunyalanyaza kuti chipangizo chopanda pake chimatha kuyambitsanso zinthu zopanda mzere zomwe, ngakhale nthawi zina zazing'ono, zimatha kukhudza kwambiri magwiridwe antchito ngati sichikonzedwa.

PIM imayimira "passive intermodulation". Imayimira intermodulation mankhwala opangidwa pamene zizindikiro ziwiri kapena kuposerapo zimafalitsidwa kudzera mu chipangizo chokhala ndi mawonekedwe osagwirizana. Kulumikizana kwa magawo olumikizidwa mwamakina nthawi zambiri kumayambitsa zotsatira zopanda mzere, zomwe zimatchulidwa makamaka pakulumikizana kwazitsulo ziwiri zosiyana. Zitsanzo ndi monga zolumikizira zingwe zotayirira, zolumikizira zonyansa, zodulira bwino, kapena tinyanga zokalamba.

Passive intermodulation ndi vuto lalikulu mumakampani olumikizirana ma cellular ndipo ndizovuta kuthetsa. M'makina olankhulirana pama foni, PIM imatha kuyambitsa kusokoneza, kuchepetsa kukhudzika kwa olandila, kapena kuletsa kulumikizana kwathunthu. Kusokoneza uku kungakhudze selo lomwe limapanga, komanso olandira ena pafupi. Mwachitsanzo, mu LTE band 2, downlink range ndi 1930 MHz mpaka 1990 MHz ndi uplink range ndi 1850 MHz mpaka 1910 MHz. Ngati awiri amatumiza zonyamulira pa 1940 MHz ndi 1980 MHz, motero, amatumiza ma sign kuchokera ku base station system ndi PIM, intermodulation yawo imapanga chigawo cha 1900 MHz chomwe chimagwera mu gulu lolandila, lomwe limakhudza wolandila. Kuphatikiza apo, intermodulation pa 2020 MHz ingakhudze machitidwe ena.

Pamene sipekitiramu ikuchulukirachulukira komanso njira zogawana tinyanga zimachulukirachulukira, mwayi wophatikizana zonyamulira zosiyanasiyana zomwe zimapanga PIM ukuwonjezeka. Njira zachikhalidwe zopewera PIM ndikukonzekera pafupipafupi zikukhala zosatheka. Kuphatikiza pa zovuta zomwe zili pamwambazi, kukhazikitsidwa kwa njira zatsopano zosinthira digito monga CDMA/OFDM kumatanthauza kuti mphamvu zapamwamba zolumikizirana zikuchulukirachulukira, zomwe zimapangitsa kuti vuto la PIM likhale "loipa".

PIM ndivuto lalikulu komanso lalikulu kwa opereka chithandizo ndi ogulitsa zida. Kuzindikira ndi kuthetsa vutoli momwe mungathere kumawonjezera kudalirika kwadongosolo ndikuchepetsa ndalama zogwirira ntchito.

Monga wopanga waRF duplexers, Jingxin akhoza kukuthandizani pa nkhani ya RF duplexers, ndi makonda zigawo kungokhala chete malinga ndi yankho lanu. Zambiri zitha kufunsidwa nafe.