Menene Fasahar Antenna Ake Amfani da su A cikin Ganewar Mitar Rediyo (RFID)?

Menene Fasahar Antenna Ake Amfani da su a cikin Gano Mitar Rediyo (RFID)?

 

A cikin shekarun da suka gabata mun magance ɗaruruwan shari'o'in gazawa, kuma kusan tara daga cikin goma sakamakon koma bayan matsalolin eriya maimakon lahani. Abin baƙin ciki shine yawancin abokan ciniki suna ɗaukar makonni suna kwatanta bayanan guntu yayin da ƙirar eriya ta ƙare a cikin kwana ɗaya ko biyu.

RFID yana ɗaukar maƙallan mitoci huɗu. Ilimin kimiyyar lissafi na eriya ya sha bamban sosai a tsakanin su wanda kwatankwacin 125 kHz coil zuwa 900 MHz dipole kamar kwatanta na'urar wuta da hasumiya ta watsa shirye-shiryen TV.

 

 

A ƙananan mitar mitoci da mitoci mai girma -125kHz da 13.56 MHz-tag ɗin yana zaune a kusa da filin eriyar mai karatu. Makamashi yana canjawa ta hanyar haɗin haɗin gwal ɗin maganadisu tsakanin coils guda biyu, kama da yadda na'ura mai canzawa ke aiki. Don haka yawanci ba ma kiransa "antenna" ko kaɗan{10}}"coil" ko "inductor" ya fi daidai. LF tana jujjuya wayan jan ƙarfe a kusa da sandunan ferrite. Ferrite yumbu ne mai babban ƙarfin maganadisu wanda ke mayar da hankali kan juzu'i zuwa ƙarami. Don 13.56 MHz, yawancin coils ne lebur spirals da aka saka akan PCB ko fim ɗin PET-a cikin masana'antar mu ma'auni shine 0.07mm kauri na tagulla.

Iyakar aiki na duka makada biyu watakila shine mita na kewayon karantawa ƙarƙashin ingantattun yanayi. Yawanci ƙasa.

 

Da zarar kun isa 860{3}960 MHz, wasan yana canzawa gaba ɗaya. Tsawon zangon yana raguwa sosai wanda eriya mai girman gaske zata iya haskaka igiyoyin lantarki a cikin fili mai nisa. Dipoles, meander{{4}layi, faci-nau'i na eriya na gaske tare da tsarin radiyo da halayen rashin ƙarfi waɗanda ke da mahimmanci.

 

Rabin -wave dipole a 915 MHz yana tafiyar da kusan santimita 16 zuwa titin. Meander{4}} ƙirar layi yana ninka wancan tsayin baya da baya don dacewa da ƙaramin lakabi. Kuna cinikin bandwidth don haɓakawa. Babban ciwon kai shine matching impedance. UHF RFID kwakwalwan kwamfuta gabatar da hadaddun impedance tare da ainihin sashi a kusa da 20Ω da capacitive reactance yawanci tsakanin -150 zuwa -220Ω dangane guntu model. Eriya dole ne ta samar da haɗin gwiwa. Software na kwaikwaiyo yana ɗaukar wannan a yanzu amma samun ingantaccen wasa a tsakanin juriyar masana'anta yana ɗaukar maimaitawa.

 

Da zaran ka lika alama akan saman karfe, aikin yana raguwa sosai{0} wannan shine tabbas al'amarin daya fi kowa yawa a cikin ayyukan UHF. Eriya na faci tare da jiragen ƙasa suna aiki a kusa da wannan amma suna ƙara farashi da kauri.

 

Makadan Microwave a 2.45 GHz da sama suna wanzu don RFID amma duba iyakataccen tallafi a wajen tarin kuɗin fito da ainihin tsarin wuri{1} lokaci.

Daidaitawar masana'anta yana raba jigilar aiki daga gazawar filin. Tashin hankali mai jujjuyawar coil yana shafar inductance. Etching chemistry yana rinjayar alamar geometry. Matsalolin buga allo suna shafar juriyar takarda. Ingancin haɗin guntu yana shafar rayuwa mai tsawo{4}. Babu ɗayan waɗannan da ke nunawa akan takardar bayanai.

Lokacin zabar mita, daidaita ilimin lissafi da matsala. LF yana shiga cikin nama kuma yana aiki kusa da karfe{1}}ganowar dabba yana gudana akan sa saboda kyakkyawan dalili. HF yana sarrafa NFC da aikace-aikacen biyan kuɗi. UHF yana ba da kewayo da sauri don ƙira da dabaru amma yana buƙatar kulawa ga abubuwan muhalli.

 

 

Ƙididdigar kewayon bayanan bayanan suna ɗaukar ingantattun yanayin dakin gwaje-gwaje{0}}tag na fuskantar mai karatu, sarari kyauta, babu tsangwama. Don ainihin shirin aikin, fara da yanke wannan lambar a rabi, sannan ku ajiye wani gefe 20% a saman. Duk abin da ke sama ya fito ne daga abin da muka koya yana tafiyar da alamar mu da kuma samar da masu karatu a Jingzhou a cikin shekaru goma sha takwas da suka gabata{4}} ku ji daɗin tuntuɓar idan kuna son tattaunawa ta musamman.