Ibanga lokufunda nokubhala lomfundi we-radio frequency identification (RFID) lincike ezintweni eziningi, njengamandla okudlulisela komfundi we-RFID, ukuzuza kwe-antenna komfundi, ukuzwela komfundi we-IC, ukusebenza kahle kwe-antenna okuphelele komfundi. , Izinto ezizungezile (ikakhulukazi izinto zensimbi) kanye nokuphazamiseka kwefrikhwensi yomsakazo (RF) okuvela kubafundi abaseduze be-RFID noma amanye ama-transmitters angaphandle afana namafoni angenazintambo.
Phakathi kwazo, ukuzuza kwe-antenna kuyisici esibalulekile esithinta ibanga lokufunda nokubhala lomfundi we-RFID.Ukuzuza kwe-antenna kubhekisela esilinganisweni sokuminyana kwamandla esiginali ekhiqizwe uthingo lwangempela kanye neyunithi yemisebe efanelekile endaweni efanayo esikhaleni ngaphansi kwesimo samandla okufaka alinganayo.Ukuzuza kwe-antenna kuwumbandela obaluleke kakhulu wokuhlolwa kokufinyelela kwenethiwekhi, okubonisa ukuqondisa kwe-antenna kanye nokugxila kwamandla esignali.Ubukhulu benzuzo buthinta ukumbozwa namandla esignali edluliswa uthi.Lapho i-lobe eyinhloko iba mncane futhi i-lobe eseceleni iba mncane, amandla azogxila kakhulu, futhi inzuzo ye-antenna izoba phezulu.Ngokuvamile, ukuthuthukiswa kwenzuzo ikakhulukazi kuncike ekwehliseni ububanzi be-lobe yemisebe iqonde mpo, kuyilapho kugcinwa ukusebenza kwemisebe ye-omnidirectional endizeni evundlile.
Amaphuzu amathathu okumele uwaqaphele
1. Ngaphandle kwalapho kucaciswe ngenye indlela, ukuzuza kothi kubhekisela enzuzweni lapho kuqondiswa khona imisebe ephezulu;
2. Ngaphansi kwezimo ezifanayo, ukukhuphuka kwenzuzo, kuba ngcono ukuqondisa, kanye nebanga elikude lokusakazwa kwamagagasi omsakazo, okungukuthi, ibanga elengeziwe elimboziwe.Kodwa-ke, ububanzi be-wave velocity ngeke bucindezelwe, futhi uma i-wave lobe iyancipha, kuba kubi kakhulu ukufana kokumboza.
3. I-antenna iyithuluzi lokwenziwa futhi ngeke inyuse amandla esignali.Inzuzo ye-antenna ngokuvamile kuthiwa ihlobene nothi oluthile lwereferensi.Inzuzo ye-antenna imane nje ikhono lokugxilisa amandla ngokuphumelelayo ukuze likhiphe noma lithole amaza kagesi ngendlela ethile.
Ukuzuza Kwe-Antenna Nokudlulisa Amandla
Ukukhipha isignali yefrikhwensi yomsakazo yisidluliseli somsakazo kuthunyelwa othini ngomphakeli (ikhebula), futhi kukhishwa uthingo ngendlela yamagagasi kagesi.Ngemva kokuba igagasi likagesi lifika endaweni yokwamukela, litholwa uthi (ingxenye encane kuphela yamandla etholwayo), bese ithunyelwa kumamukeli womsakazo ngesiphakeli.Ngakho-ke, kubunjiniyela benethiwekhi engenantambo, kubaluleke kakhulu ukubala amandla okudlulisa edivayisi yokudlulisa kanye nekhono lemisebe ye-antenna.
Amandla adluliswayo amaza omsakazo asho amandla angaphakathi kwebanga lefrikhwensi enikeziwe, futhi ngokuvamile kuba nezilinganiso ezimbili noma izindinganiso zokulinganisa:
Amandla (W)
Ihlobene neleveli yomugqa ongu-1 Watts (Watts).
Inzuzo (dBm)
Ngokuphathelene neleveli yokulingana ye-milliwatt engu-1 (Milliwatt).
Izinkulumo ezimbili zingaguqulelwa komunye nomunye:
dBm = 10 x log[amandla mW]
mW = 10^[Gain dBm / 10 dBm]
Ezinhlelweni ezingenantambo, ama-antenna asetshenziswa ukuguqula amagagasi amanje abe amaza kagesi.Phakathi nenqubo yokuguqulwa, amasignali adlulisiwe futhi awamukelwe nawo "angakhuliswa".Isilinganiso salokhu kukhuliswa kwamandla sibizwa ngokuthi “Gain”.Ukuzuza kwe-antenna kukalwa nge-“dBi”.
Njengoba amandla kazibuthe we-electromagnetic wave ohlelweni olungenantambo enziwa ukukhuliswa nokubekwa phezulu kwamandla okudlulisa edivayisini yokudlulisela kanye ne-antenna, kungcono ukukala amandla okudlulisa ngenzuzo efanayo yokulinganisa (dB), isibonelo, amandla edivayisi yokudlulisa angu-100mW, noma 20dBm;inzuzo ye-antenna ngu-10dBi, bese:
Ukudlulisa amandla ewonke = amandla okudlulisa (dBm) + inzuzo ye-antenna (dBi)
= 20dBm + 10dBi
= 30dBm
Noma: = 1000mW = 1W
Gcoba "isondo", lapho isignali igxilile, inzuzo enkulu, ubukhulu be-antenna bukhulu, kanye nomkhawulokudonsa we-beam ube mncane.
Impahla yokuhlola ingumthombo wesignali, i-spectrum analyzer noma enye impahla yokwamukela isignali kanye nerediyetha yomthombo wamaphoyinti.
Okokuqala sebenzisa i-antenna yomthombo wemisebe yephoyinti efanelekile (ecishe ifane) ukwengeza amandla;bese usebenzisa i-spectrum analyzer noma idivayisi eyamukelayo ukuze uhlole amandla awamukelwe ebangeni elithile ukusuka othini.Amandla atholakele alinganisiwe yi-P1;
Faka esikhundleni i-antenna ngaphansi kokuhlolwa, engeza amandla afanayo, phinda ukuhlolwa okungenhla endaweni efanayo, futhi amandla atholiwe alinganisiwe angu-P2;
Bala inzuzo: G=10Log(P2/P1)——Ngale ndlela, inzuzo yothi iyatholwa.
Ukufingqa, kungabonakala ukuthi uthi luyidivayisi engenzi lutho futhi alukwazi ukukhiqiza amandla.Inzuzo ye-antenna kuphela ikhono lokugxilisa amandla ngokuphumelelayo ukuze likhiphe noma lithole amaza kagesi ngendlela ethile;inzuzo ye-antenna ikhiqizwa yi-superposition yama-oscillator.Lapho inzuzo iphezulu, ubude be-antenna buba bude.Inzuzo yanda nge-3dB, futhi ivolumu iphindwe kabili;ukuphakama kwenzuzo ye-antenna, i-directivity engcono, ibanga lokufunda liba kude, amandla agxilile kakhulu, ama-lobes abe mancane, futhi ibanga lokufunda liyancipha.II-Handheld-WIreless I-RFID ephathwayoingasekela ukuzuza kwe-antenna engu-4dbi, amandla okukhipha i-RF angafinyelela ku-33dbm, futhi ibanga lokufunda lingafinyelela ku-20m, elingahlangabezana nezidingo zokuhlonza nokubala zamaphrojekthi amaningi we-inventory kanye ne-warehouse.
Isikhathi sokuthumela: Dec-29-2022