物流专业英语教程（第4版） 课件 -Unit 22-A A Basic System of RFID.pptx

物流专业英语教程

（第4版）;PassageA;;Introduction;(1)AprogrammableRFIDtag/inlayforstoringitemdatacomprisingof:

AnRFIDchipfordatastorage;

AnantennatofacilitatecommunicationwiththeRFIDchip.

(2)Areader/antennasystemtointerrogatetheRFIDinlay.;RFIDtagsarecategorizedaseitherpassiveoractive.PassivetagsdonothaveanintegratedpowersourceandarepoweredfromthesignalcarriedbytheRFIDreader.Activetagshaveabuilt-inpowersource,andtheirbehaviorcanbecomparedtoabeacon.

TheRFIDtagconsistsofanintegratedcircuit(IC)embeddedinathinfilmmedium.

TheinformationstoredinanRFIDchipisdefinedbyitsread/writecharacteristics.Foraread-onlytag,theinformationstoredmustberecordedduringthemanufacturingprocessandcannotbetypicallymodifiedorerased.Foraread/writetag,datacanbewrittenanderasedondemandatthepointofapplication.;TheRFIDsystemisdesignedtooperateatmultiplespecifiedfrequencies,dependingonapplicationrequirementsandlocalRFregulations:

(1)LowFrequency(125kHz);

(2)HighFrequency(13.56MHz);

(3)UltraHighFrequency(860-960MHz);

(4)Microwave(2.45GHz).;Low-frequencytagsaretypicallyusedforaccesscontrolsecurity,manufacturingprocesses,harshenvironments,andanimalidentificationapplicationsinavarietyofindustrieswhichrequireshortreadranges.High-frequencytagsweredevelopedasalow-cost,small-profilealternativetolow-frequencyRFIDtagswiththeabilitytobeprintedorembeddedinsubstratessuchaspaper.;UHFtagsboastgreaterreaddistancesandsuperioranti-collisioncapabilities,increasingtheabilitytoidentifyalargernumberoftagsinthefieldatagiventime.

MicrowavetagsaremostlyusedinactiveRFIDsystems,offeringlongrangeandhighdatatransferspeedsatsignificantlyhighercostpertagmakingthemsuitableforrailroadcartracking,containertracking,andautomatedtollcollectiontypeapplications