Iyini i-Antenna ye-Loop?
I-antenna yeluphu yakhiwa ngokuhlela into eyodwa noma ngaphezulu eqhubayo endleleni evaliwe bese iphakela isakhiwo ngesignali ye-RF. Iluphu ingaba yindilinga, isikwele, unxande, unxantathu, i-elliptical, noma iklanywe ngenye indlela ukuze ihlangabezane nezidingo ezithile zemishini kanye nogesi.
Ngokungafani ne-antenna evamile ye-dipole, ehlotshaniswa kakhulu nesici samandla kagesi, iluphu encane kagesi isebenza cishe njenge-dipole yamagnetic. Ukusebenza kwayo kuhlobene eduze nengxenye ye-magnetic-field yegagasi le-electromagnetic, okwenza ama-antenna e-loop abe usizo kakhulu ekwamukeleni, ekutholeni isiqondiso, ekuzweleni eduze kwensimu, e-RFID, kanye nasezinhlelweni zokulinganisa i-electromagnetic.
Ama-antenna e-loop awakhawulelwe kububanzi obulodwa bemvamisa. Imvamisa yokusebenza kwawo incike ekuzungelezeni kwe-loop maqondana nobude be-wavelength, inani lokujika, ubukhulu bomqhubi, izingxenye zokulayisha, isakhiwo sokudla, kanye nendawo yokufaka ezungezile. Ngakho-ke imiklamo ye-loop ingatholakala kusukela ezinhlelweni zokwamukela imvamisa ephansi kuya ku-UHF kanye nezinhlelo zokusebenza ze-microwave.
Isakhiwo Esiyisisekelo kanye Nesimiso Sokusebenza
Uma ugesi we-RF ugeleza uzungeze iluphu eqhubayo, ukhiqiza insimu yamagnetic ecishe iqonde endizeni yeluphu. Ekusebenzeni kokwamukela, insimu yamagnetic eshintshayo edlula kuluphu ibangela i-voltage kuma-terminal ayo.
Amandla esignali esitholiwe ancike ezintweni eziningana:
Indawo yeluphu
Inani lamajika
Imvamisa yokusebenza
Ukuqondiswa okuhlobene nensimu engenayo
Ukumelana nomqhubi
Ukulungisa nokufanisa inethiwekhi
Izakhiwo zokuvikela nezensimbi eziseduze
Kuluphu oluncane ngogesi, ubukhulu bamanje kanye nesigaba kungaphathwa njengokufana okuzungeze umqhubi. Lokhu kulinganiselwa kuba yinto enganembile njengoba umjikelezo ukhula. Kuluphu olukhulu olune-resonant, ukusatshalaliswa kwamanje kuyahlukahluka kakhulu eduze kwesakhiwo futhi kukhiqiza izici zomsebe ezihlukile kulezo zoluphu oluncane olune-magnetic.
Ama-Antenna Amancane Ajikelezayo
I-antenna encane ejikelezayo inomjikelezo omncane kakhulu kunobude besikhathi obusebenzayo. Ukulinganisa kobunjiniyela okusetshenziswa kakhulu yilokhu:
C≤0.1λ
lapho u-C eyindilinga yeluphu kanye no-λ iyindilinga yobude besikhathi.
Ngenxa yobukhulu bayo obuncane kagesi, iluphu encane ngokuvamile inokumelana okuphansi kwemisebe. Ngakho-ke ukulahleka komqhubi kungase kube yingxenye ebalulekile yokumelana kwayo okuphelele kokufaka, kunciphisa ukusebenza kahle kwemisebe lapho i-antenna isetshenziselwa ukudlulisa.
Ama-loop amancane nawo anamandla kakhulu okukhuthaza futhi avame ukudinga i-tuning capacitor noma inethiwekhi yokufanisa. Uma elungiswe ukuze avumelane ne-resonance, anganikeza ukuzwela okuwusizo kokwamukela, kodwa isici sawo sekhwalithi ephezulu singase siholele ku-bandwidth yokusebenza encane.
Lezi zici azikwenzi ama-antenna amancane abe mabi. Kunalokho, ziwenza afaneleke kakhulu ekusetshenzisweni lapho usayizi omncane, impendulo yamagnetic-field, ama-directional nulls, noma ukukhetha kwe-narrowband kubaluleke kakhulu kunokusebenza kahle kwemisebe ephezulu.
Ama-Antenna Amakhulu Ajikelezayo
Iluphu enkulu, ngezinye izikhathi ebizwa ngokuthi iluphu ezwakalayo, inomjikelezo ongasancane ngogesi. Umklamo ovamile usebenzisa umjikelezo oseduze nobude begagasi elilodwa:
C≈λ
Kulesi simo, ugesi awufani nxazonke kweluphu. Ubukhulu bawo kanye noshintsho lwesigaba eceleni komqhubi, okukhiqiza ukusatshalaliswa kwensimu okuyinkimbinkimbi kakhulu.
Uma kuqhathaniswa nezihibe ezincane zikagesi, izihibe eziphendulayo zivame ukunikeza ukumelana okukhulu kwemisebe kanye nokusebenza kahle kokudlulisa. Zingasetshenziswa njenge-antenna yokudlulisa noma yokwamukela esebenzayo, yize i-impedance yazo, i-polarisation kanye nephethini yokukhanya kuncike kakhulu ekuzungeni, ukuma, indawo yokudla kanye nendawo yokufaka.
Izihibe ezigcwele amaza eziyindilinga neziyisikwele ziyizinto ezivamile ezilungiselelwe. I-loop yesikwele ingaba lula ukuyikhiqiza nokuyifaka, kuyilapho i-loop eyindilinga inikeza i-geometry ebushelelezi nelinganayo. Uma zombili zine-circumference kagesi efanayo, ukusebenza kwazo okuvamile kungafana, yize i-impedance eqondile kanye nezici zephethini zizohluka.
Umfanekiso 1. Izibonelo zokucushwa kwe-antenna yeluphu eyindilinga neyisikwele.
Iphethini Yokushiswa Kwemisebe
Iphethini yemisebe yeluphu encane kagesi ifana neye-dipole kamagnetic efanele. Imisebe incane kakhulu eceleni kwe-axis eqondile nendilinga yeluphu futhi inamandla kakhulu eziqondisweni ezilele cishe ngaphakathi kwendilinga yeluphu.
Ngezilinganiso ezintathu, iphethini efanelekile ifana ne-torus ezungeze i-axis ye-loop. Uma i-loop encane ifakwe ngokuqondile, impendulo yayo ye-horizontal-plane ngokuvamile inomumo wesibalo-eight, kanye nama-nulls amabili ajulile ajwayelekile ku-loop plane.
Lezi zi-nulls ziwusizo ekutholeni isiqondiso kanye nokucindezela ukuphazamiseka. Ngokuzungezisa i-antenna kuze kube yilapho isignali eyamukelwe ifinyelela ubuncane, umqhubi anganquma umugqa wokuthwala obheke noma oqhelelene nomthombo wesignali.
Isiqondiso sempendulo ephezulu, ukujula kwe-null kanye ne-polarization kuncike ekuqondisweni kwe-loop, ukuhlelwa kokudla, ukuphakama kokufakwa, i-geometry yomqhubi kanye nezakhiwo eziseduze. Ngakho-ke i-polarization akufanele ichazwe kuphela ngokuya ngendawo yephuzu lokuphakelayo.
Umfanekiso 2. Amaphethini okubonisa imisebe ye-antenna ejikelezayo ngama-engeli ahlukene okuphakama.
Ukondla, Ukulungisa kanye Nokufaniswa Kwe-Impedance
Ukuphazamiseka kokufaka kwe-antenna ye-loop kuncike kakhulu kusayizi wayo kagesi.
Iluphu encane ivame ukuveza ukusabela okukhuthazayo kanye nokumelana nemisebe ephansi. I-capacitor eguquguqukayo noma egxilile ingaxhunywa ukuze yakhe isekethe ephendulayo ngemvamisa edingekayo. Ukuxhumanisa i-transformer, ukufanisa i-gamma, ukuxhumanisa i-capacitive noma amasekethe e-amplifier asebenzayo nawo angasetshenziswa ukuxhumanisa i-antenna ne-receiver noma uhlelo lwe-RF lwama-ohm angu-50.
Ngezinhlelo zokusebenza zokudlulisa, ukulahlekelwa ngumqhubi, ukulahlekelwa yi-capacitor kanye nekhono lokuphatha ugesi kudinga ukucatshangelwa ngokucophelela. Ugesi ojikelezayo ophezulu ungase uvele ku-loop elungisiwe ngisho noma amandla okufaka ebonakala emaphakathi.
Izihibe ezinkulu ze-resonant zinokumelana okukhulu kwemisebe kodwa zisadinga indawo efanele yokuphakelayo kanye nokuguqulwa kwe-impedance. Ukudla okulinganiselayo noma i-balun kungadingeka ukuvimbela ikhebula lokuphakelayo ukuthi lingabi yingxenye yesistimu yokuphakelayo.
Isimo seLoop kanye neNombolo Yokujika
I-antenna ejikelezayo akudingeki ibe yindilinga ngokuphelele. Izindilinga eziyindilinga, eziyisikwele neziyindilinga yizona ezivame kakhulu ngoba kulula ukuzibala nokukwazi ukuzenza.
Ukwengeza amajika amaningi kwandisa i-voltage yokwamukela ebangelwayo kanye ne-inductance. Kodwa-ke, kwandisa nokulahlekelwa yi-conductor, amandla asakazekile kanye nemiphumela ye-self-resonance. Amajika amaningi awakhiqizi ngokuzenzakalelayo ukusebenza kwe-broadband okungcono.
Izinduku ze-Ferrite noma ama-core magnetic zivame ukusetshenziswa kuma-antenna athola i-MF kanye ne-AM. Izinto ezisebenzisa amandla kazibuthe zigxila ekugelezeni kwamandla kazibuthe, okuvumela isakhiwo esincane ngokomzimba ukuthi sinikeze ukuzwela okuwusizo kokwamukela.
Kumaza aphezulu, ama-loop aphrintiwe, ama-loop e-microstrip kanye nezakhiwo ze-loop ezihlanganisiwe zingakhiqizwa ngqo kumabhodi wesekethe e-RFID, i-wireless sensing, ama-terminals okuxhumana kanye namadivayisi okulinganisa i-RF.
Izinzuzo ze-Loop Antennas
Ama-antenna e-Loop anikeza izinzuzo eziningana ezisebenzayo:
- Isakhiwo esincane semishini
- Izimo eziningi ezingenzeka kanye namafomethi okufaka
- Ukuzwela okuwusizo kwensimu yamagnetic
- Ama-null aqondile ajulile kumiklamo emincane
- Ilungele ukuthola isiqondiso kanye nokwenqatshwa kokuphazamiseka
- Ukuhlanganiswa okulula nokulungiswa kanye nezifunda ezisebenzayo
- Ingalinganiswa ngemiklamo ye-LF, HF, VHF, UHF kanye ne-microwave
Ukulinganiselwa Kokuklama
Imikhawulo ebalulekile ihlanganisa:
- Ukumelana nemisebe ephansi emiklamo emincane kagesi
- Ukunciphisa ukusebenza kahle kokudlulisa lapho ukulahlekelwa ngumqhubi kubalulekile
- I-bandwidth encane kuma-loop ahlelwe nge-Q ephezulu
- Ukuzwela ezintweni zensimbi eziseduze
- Amandla kagesi kanye ne-voltage ejikelezayo okungenzeka kube phezulu
- Isidingo sokuqhathanisa ngokucophelela kwe-impedance
- Ukuphambuka kwephethini okubangelwa izintambo zokuphakelayo nezakhiwo zokufaka
Izicelo Ezijwayelekile
Ama-antenna e-Loop asetshenziswa kabanzi ku:
- Ama-AM, MF, HF kanye nama-shortwave receiver
- Imishini yokuthola isiqondiso somsakazo
- Izinhlelo zokuxhumana ze-RFID kanye nezindawo zokuxhumana eziseduze
- Ukulinganiswa kwe-EMI kanye ne-EMC magnetic-field
- Ukuqapha i-spectrum kanye nokuhlolwa kwamandla ensimu
- Izinhlelo zokuxhumana eziholela ekuhoxisweni kanye nezinhlelo zamandla ezingenantambo
- Amapulatifomu okwamukela aphathekayo nafakwe emotweni
- Amasekethe e-RF aphrintiwe kanye nama-microwave
- Ucwaningo lwe-antenna, ukulinganisa kanye nokulinganisa
Ngokukalwa kwe-EMI kanye namandla ensimu, ama-antenna e-loop alinganisiwe awusizo kakhulu lapho ingxenye yensimu yamagnetic yendawo ye-RF kufanele ihlolwe. Ezinhlelweni zokuxhumana nokuqapha, ama-directional nulls azo angasiza ekunciphiseni ukuphazamiseka noma ukuhlonza isiqondiso sesignali engaziwa.
Ukubaluleka Kobunjiniyela
Ama-antenna ajikelezayo abonisa ukuthi usayizi kagesi, ukusatshalaliswa kwamanje, ukuhlanganiswa kwe-magnetic-field kanye nokuqhathaniswa kwe-impedance kuthinta kanjani ukusebenza kwe-antenna.
Iluphu efanayo ngokomzimba ingasebenza njenge-antenna ethola amandla kazibuthe aqinile, inzwa ye-resonant ye-narrowband, i-antenna edlulisa amaza agcwele noma i-near-field coupling element, kuye ngokuthi ijikeleza kangakanani kanye nemvamisa yokusebenza kwayo.
I-RF MISO inikeza izixazululo ze-antenna kanye nezingxenye ze-microwave zokuhlola i-RF, ukuxhumana, i-radar, ukulinganisa i-antenna kanye nokuhlanganiswa kwesistimu. Ukuqonda izakhiwo eziyisisekelo njenge-antenna ye-loop kusiza onjiniyela ukuhlola ububanzi bemvamisa, inzuzo, i-polarization, i-impedance, i-bandwidth, ukusebenza kahle kwemisebe kanye nempendulo eqondisayo lapho bekhetha noma bethuthukisa uhlelo lwe-antenna.
Ukuze ufunde kabanzi ngama-antenna, sicela uvakashele:
Isikhathi sokuthunyelwe: Julayi-31-2026
