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Iyo yekuverenga nekunyora chinhambwe cheredhiyo frequency identification (RFID) muverengi zvinoenderana nezvakawanda zvinhu, senge simba rekufambisa remuverengi weRFID, kuwana kweantenna yemuverengi, kunzwa kwemuverengi IC, kugona kweantenna kwemuverengi. , Izvo zvakatenderedza Zvinhu (kunyanya zvinhu zvesimbi) uye redhiyo frequency (RF) kukanganiswa kubva kune vari pedyo RFID vaverengi kana mamwe ekunze ekutumira senge tambo dzisina tambo.

Pakati pavo, iyo antenna kuwana chinhu chakakosha chinokanganisa kuverenga nekunyora kureba kweRFID muverengi.Kuwana antenna kunoreva chiyero chesimba resimba rechiratidzo chinogadzirwa neiyo antenna chaiyo uye yakanakira radiation unit panzvimbo imwechete muchadenga pasi pemamiriro esimba rekupinza rakaenzana.Kuwana kweAntenna ndiyo chiyero chakanyanya kukosha chekuyedzwa kwetiweki yekuwana, iyo inoratidza kutungamira kweiyo antenna uye kusangana kwechiratidzo chesimba.Saizi yekuwana inokanganisa kuvharika uye simba rechiratidzo chinofambiswa neantenna.Iyo yakatetepa iyo huru lobe uye iyo diki yedivi lobe, iyo yakanyanya kusimba iyo simba ichave, uye iyo yakakwirira iyo antenna kuwana ichave.Kazhinji kutaura, kuvandudzwa kweiyo pfuma kunonyanya kuenderana nekudzikisa iyo lobe upamhi hwemwaranzi munzira yakatwasuka, uku uchichengetedza iyo omnidirectional radiation kuita mundege yakachinjika.

Zvitatu zvekucherechedza

1. Kunze kwekunge zvatsanangurwa neimwe nzira, iyo antenna kuwana inoreva kuwana mune yakanyanya radiation nzira;
2. Pasi pemamiriro akafanana, iyo inowedzera pfuma, zviri nani kunanga, uye kure kure kureba kweredhiyo wave kuparadzira, ndiko kuti, nhambwe yakawedzera yakavharwa.Zvisinei, hupamhi hwevheji yevheji haizomanikidzikidzwa, uye iyo yakamanikana iyo wave lobe, yakaipisisa kufanana kwekuvhara.
3. Iyo antenna chinhu chisingaiti uye haizowedzere simba rechiratidzo.Kuwana antenna kunowanzo kunzi kune hukama kune imwe referensi antenna.Antenna kuwana ingori kugona kunyatso tarisa simba kupenya kana kugamuchira mafungu emagetsi mune imwe nzira.

Antenna Kuwana uye Kuendesa Simba

Iyo redhiyo frequency chiratidzo inoburitswa neredhiyo transmitter inotumirwa kune antenna kuburikidza neyekudyisa (tambo), uye inovhenekerwa neantenna muchimiro chemagetsi emagetsi.Mushure mekunge iyo electromagnetic wave yasvika panzvimbo inogashira, inotambirwa neantenna (chikamu chidiki chete chesimba chinogamuchirwa), uye inotumirwa kune inogamuchira redhiyo kuburikidza neyekudyisa.Naizvozvo, mune isina waya network engineering, zvakakosha kwazvo kuverenga simba rekutumira remudziyo wekutumira uye kugona kwemwaranzi yeantenna.

Simba rinofambiswa remasaisai eredhiyo rinoreva simba riri mukati menguva yakapihwa frequency renji, uye kazhinji pane zviyero zviviri kana kuyerwa zviyero:

Simba (W)

Inoenderana ne1 Watts (Watts) mutsetse nhanho.

Gain (dBm)

Zvinei nechiyero chechikamu che1 milliwatt (Milliwatt).

Aya mazwi maviri anogona kushandurwa kune mumwe nemumwe:

dBm = 10 x log[simba mW]

mW = 10^[Gain dBm / 10 dBm]

Mune mawaya masystem, antennas anoshandiswa kushandura mafungu azvino kuita emagetsi emagetsi.Munguva yekushandura, zviratidzo zvinotumirwa uye zvakagamuchirwa zvinogonawo "kuwedzerwa".Chiyero chekuwedzerwa kwesimba uku chinonzi "Gain".Antenna kuwana inoyerwa mu "dBi".

Sezvo iyo electromagnetic wave simba mune isina waya system inogadzirwa nekukwidziridzwa uye kukwirisa kwesimba rekufambisa remudziyo wekufambisa uye antenna, zviri nani kuyera simba rekufambisa nechiyero chakafanana-kuwana (dB), semuenzaniso, simba remudziyo wekutumira i100mW, kana 20dBm;iyo antenna kuwana ndeye 10dBi, ipapo:

Kutumira simba rakazara = simba rekutumira (dBm) + antenna kuwana (dBi)
= 20dBm + 10dBi
= 30dBm
Kana: = 1000mW = 1W

Gadzirisa "tai", iyo yakanyanya kuisa chiratidzo, iyo inowedzera kuwedzera, iyo yakakura saizi yeantenna, uye yakamanikana danda bandwidth.
Midziyo yekuyedza ndiyo sosi yechiratidzo, spectrum analyzer kana imwe chiratidzo chekugamuchira michina uye point source radiator.
Kutanga shandisa yakanaka (inenge yakanaka) point source radiation antenna kuwedzera simba;wobva washandisa spectrum analyzer kana mudziyo wekugamuchira kuti uedze simba rakagamuchirwa pane imwe chinhambwe kubva kune antenna.Iyo yakayerwa yakagamuchirwa simba iP1;
Tsiva antenna pasi pekuyedzwa, wedzera simba rimwechete, dzokorora bvunzo iri pamusoro panzvimbo imwechete, uye yakayerwa yakagamuchirwa simba iP2;
Verenga mubairo: G=10Log(P2/P1)——Nenzira iyi, kuwana kweantenna kunowanikwa.

Kupfupisa, zvinogona kuoneka kuti antenna chigadziriso uye haigone kuburitsa simba.Iyo antenna kuwana ingori kugona kunyatso kumisa simba kupenya kana kugamuchira mafungu emagetsi mune yakananga nzira;kuwana kweantenna kunogadzirwa nepamusoro-soro ye oscillators.Iyo yakakwirira kuwana, iyo yakareba iyo antenna kureba.Kuwana kunowedzerwa ne3dB, uye vhoriyamu yakapetwa kaviri;iyo yakakwira iyo antenna kuwana, zvirinani kunanga, kureba kwechinhambwe chekuverenga, kunowedzera simba, kutetepa kwelobes, uye kutetepa kwekuverenga.TheHandheld-WIreless RFID inobata ruokoinogona kutsigira 4dbi antenna kuwana, iyo RF inobuda simba inogona kusvika 33dbm, uye chinhambwe chekuverenga chinogona kusvika 20m, iyo inogona kusangana nekuzivikanwa uye kuverenga zvinodiwa zveakawanda einventory uye mapurojekiti ekuchengetera zvinhu.