1. Taw qhia rau Antennas
Lub kav hlau txais xov yog ib qho kev hloov pauv ntawm qhov chaw dawb thiab cov kab sib kis, raws li pom hauv daim duab 1. Cov kab sib kis tuaj yeem ua rau hauv cov kab coaxial lossis lub hollow raj (waveguide), uas yog siv los xa cov hluav taws xob hluav taws xob los ntawm qhov chaw. mus rau lub kav hlau txais xov, lossis los ntawm tus kav hlau txais xov mus rau lub receiver.Tus qub yog lub kav hlau txais xov xa xov, thiab tom kawg yog qhov tau txaiskav hlau txais xov.
Daim duab 1 Electromagnetic zog kis tau tus mob
Kev sib kis ntawm cov kav hlau txais xov hauv kev sib kis ntawm daim duab 1 yog sawv cev los ntawm Thevenin sib npaug raws li qhia hauv daim duab 2, qhov twg lub hauv paus yog sawv cev los ntawm lub tshuab hluav taws xob zoo tshaj plaws, cov kab sib kis tau sawv cev los ntawm kab nrog cov yam ntxwv impedance Zc, thiab tus kav hlau txais xov yog sawv cev los ntawm lub load ZA [ZA = (RL + Rr) + jXA].Lub load tsis kam RL sawv cev rau kev coj ua thiab dielectric poob cuam tshuam nrog cov qauv kav hlau txais xov, thaum Rr sawv cev rau cov hluav taws xob tiv thaiv ntawm lub kav hlau txais xov, thiab cov reactance XA yog siv los sawv cev rau qhov kev xav ntawm qhov impedance cuam tshuam nrog cov kav hlau txais xov hluav taws xob.Nyob rau hauv cov xwm txheej zoo tagnrho, txhua lub zog tsim los ntawm lub teeb liab yuav tsum raug xa mus rau cov hluav taws xob tiv thaiv Rr, uas yog siv los sawv cev rau lub peev xwm hluav taws xob ntawm lub kav hlau txais xov.Txawm li cas los xij, hauv kev siv tswv yim, muaj cov neeg xyuas pib-dielectric poob vim yog cov yam ntxwv ntawm cov kab sib kis thiab cov kav hlau txais xov, nrog rau kev poob los ntawm kev xav (tsis sib haum) ntawm cov kab sib txuas thiab kav hlau txais xov.Xav txog qhov cuam tshuam sab hauv ntawm qhov chaw thiab tsis quav ntsej cov kab sib kis thiab kev cuam tshuam (mismatch) poob, lub zog siab tshaj plaws yog muab rau cov kav hlau txais xov nyob rau hauv conjugate txuam.
Daim duab 2
Vim yog qhov tsis sib xws ntawm cov kab sib kis thiab cov kav hlau txais xov, qhov cuam tshuam yoj ntawm lub interface yog superimposed nrog qhov xwm txheej nthwv dej los ntawm qhov chaw mus rau lub kav hlau txais xov los ua ib qho yoj sawv ntsug, uas sawv cev rau lub zog concentration thiab khaws cia thiab yog ib qho khoom siv resonant.Ib tug qauv sawv ntsug yoj yog qhia los ntawm cov kab dotted hauv daim duab 2. Yog tias lub kav hlau txais xov tsis tau tsim kom zoo, cov kab sib kis tuaj yeem ua tau zoo li lub zog cia khoom ntau dua li cov khoom siv waveguide thiab lub zog sib kis.
Qhov kev poob los ntawm cov kab sib kis, kav hlau txais xov thiab sawv tsis tau yog qhov tsis xav tau.Cov kab poob tuaj yeem raug txo kom tsawg los ntawm kev xaiv cov kab qis qis, thaum lub kav hlau txais xov poob tuaj yeem raug txo los ntawm kev txo qhov poob tsis kam sawv cev los ntawm RL hauv daim duab 2. Kev sawv nthwv dej tuaj yeem txo tau thiab lub zog cia hauv kab tuaj yeem txo qis los ntawm kev sib piv cov impedance ntawm tus kav hlau txais xov (load) nrog cov yam ntxwv impedance ntawm kab.
Hauv cov tshuab wireless, ntxiv rau kev txais lossis xa lub zog, cov kav hlau txais xov feem ntau yuav tsum tau txhim kho cov hluav taws xob hluav taws xob hauv qee cov lus qhia thiab cuam tshuam lub zog hluav taws xob hauv lwm cov lus qhia.Yog li ntawd, ntxiv rau cov cuab yeej tshawb nrhiav, cov kav hlau txais xov kuj yuav tsum tau siv los ua cov khoom siv coj los siv.Cov kav hlau txais xov tuaj yeem ua ntau hom kom tau raws li cov kev xav tau tshwj xeeb.Nws tuaj yeem yog hlau, aperture, thaj, ib qho khoom sib dhos (array), lub reflector, lub lens, thiab lwm yam.
Hauv kev sib txuas lus wireless, kav hlau txais xov yog ib qho tseem ceeb tshaj plaws.Tus kav hlau txais xov zoo tsim tuaj yeem txo cov kev xav tau ntawm lub cev thiab txhim kho kev ua haujlwm tag nrho.Ib qho piv txwv classic yog TV, qhov chaw txais xov xwm tuaj yeem txhim kho los ntawm kev siv cov kav hlau txais xov zoo.Antennas yog rau kev sib txuas lus systems dab tsi qhov muag yog rau tib neeg.
2. Kev faib cov kav hlau txais xov
Lub kav hlau txais xov horn yog lub kav hlau txais xov xwm txheej, lub kav hlau txais xov microwave nrog lub voj voog lossis duab plaub ntu uas maj mam qhib thaum kawg ntawm lub waveguide.Nws yog hom kev siv ntau tshaj plaws ntawm microwave kav hlau txais xov.Nws cov hluav taws xob hluav taws xob yog txiav txim siab los ntawm qhov loj ntawm lub horn lub aperture thiab hom propagation.Ntawm lawv, qhov cuam tshuam ntawm phab ntsa horn ntawm cov hluav taws xob tuaj yeem suav nrog siv lub hauv paus ntsiab lus ntawm geometric diffraction.Yog tias qhov ntev ntawm lub horn tseem tsis hloov pauv, qhov aperture loj thiab lub quadratic theem sib txawv yuav nce nrog qhov nce ntawm lub horn qhib lub kaum ntse ntse, tab sis qhov nce yuav tsis hloov nrog lub aperture loj.Yog hais tias qhov zaus band ntawm lub horn yuav tsum tau nthuav dav, nws yog ib qho tsim nyog los txo qhov kev xav ntawm lub caj dab thiab lub aperture ntawm lub horn;qhov kev xav yuav txo qis thaum lub aperture loj zuj zus.Cov qauv ntawm lub kav hlau txais xov horn yog qhov yooj yim, thiab cov qauv hluav taws xob kuj yog qhov yooj yim thiab yooj yim los tswj.Nws feem ntau yog siv los ua tus kav hlau txais xov nruab nrab.Parabolic reflector horn antennas nrog dav bandwidth, qis sab lobes thiab kev ua haujlwm siab feem ntau yog siv hauv kev sib txuas lus microwave relay.
RMDCPHHA 105145-20 (10.5-14.5GHz)
RM-BDHA1850-20 (18-50GHz)
RM-SGHA430-10 (1.70-2.60GHz)
2. Microstrip kav hlau txais xov
Cov qauv ntawm microstrip kav hlau txais xov feem ntau yog tsim los ntawm dielectric substrate, radiator thiab av dav hlau.Lub thickness ntawm dielectric substrate yog ntau me dua lub wavelength.Cov hlau nyias txheej nyob rau hauv qab ntawm substrate yog txuas nrog lub dav hlau hauv av, thiab cov hlau nyias txheej nrog ib tug tshwj xeeb zoo yog tsim nyob rau hauv pem hauv ntej los ntawm photolithography txheej txheem raws li ib tug radiator.Cov duab ntawm lub radiator tuaj yeem hloov tau ntau txoj hauv kev raws li qhov xav tau.
Qhov nce ntawm microwave kev koom ua ke thev naus laus zis thiab cov txheej txheem tsim khoom tshiab tau txhawb kev txhim kho ntawm microstrip antennas.Piv nrog cov kav hlau txais xov ib txwm muaj, microstrip antennas tsis yog tsuas yog me me, lub teeb hauv qhov hnyav, tsis tshua muaj profile, yooj yim rau kev ua raws, tab sis kuj yooj yim rau kev sib koom ua ke, tsis tshua muaj nqi, tsim nyog rau kev tsim khoom loj, thiab tseem muaj qhov zoo ntawm cov khoom siv hluav taws xob sib txawv. .
RM-MA424435-22 (4.25-4.35GHz)
RM-MA25527-22 (25.5-27GHz)
3. Waveguide qhov kav hlau txais xov
Lub waveguide slot kav hlau txais xov yog ib lub kav hlau txais xov uas siv cov slots hauv cov qauv waveguide kom ua tiav cov hluav taws xob.Nws feem ntau muaj ob daim hlau sib txuas ua ke ua ib lub voj voog nrog qhov sib txawv ntawm ob daim hlau.Thaum electromagnetic nthwv dej dhau los ntawm qhov sib txawv waveguide, qhov tshwm sim resonance yuav tshwm sim, yog li tsim kom muaj zog electromagnetic teb ze ntawm qhov sib txawv kom ua tiav hluav taws xob.Vim nws cov qauv yooj yim, waveguide qhov kav hlau txais xov tuaj yeem ua tiav cov hluav taws xob dav dav thiab ua haujlwm siab, yog li nws tau siv dav hauv radar, kev sib txuas lus, wireless sensors thiab lwm yam kev lag luam hauv microwave thiab millimeter yoj bands.Nws qhov zoo muaj xws li hluav taws xob ua haujlwm siab, cov yam ntxwv dav dav thiab muaj peev xwm tiv thaiv kev cuam tshuam zoo, yog li nws nyiam los ntawm engineers thiab cov kws tshawb fawb.
RM-PA7087-43 (71-86GHz)
RM-PA1075145-32 (10.75-14.5GHz)
RM-SWA910-22 (9-10GHz)
4.Biconical Kav hlau txais xov
Biconical Kav hlau txais xov yog ib tug broadband kav hlau txais xov nrog ib tug biconical qauv, uas yog yus muaj los ntawm ntau zaus teb thiab high radiation efficiency.Ob qhov conical ntawm lub kav hlau txais xov biconical yog symmetrical rau ib leeg.Los ntawm cov qauv no, cov hluav taws xob muaj txiaj ntsig zoo nyob rau hauv qhov dav dav tuaj yeem ua tiav.Nws feem ntau yog siv rau hauv thaj chaw xws li spectrum tsom xam, ntsuas hluav taws xob thiab EMC (electromagnetic compatibility) kuaj.Nws muaj qhov sib txuam zoo impedance thiab hluav taws xob cov yam ntxwv thiab tsim nyog rau daim ntawv thov scenarios uas yuav tsum tau npog ntau zaus.
RM-BCA2428-4 (24-28GHz)
RM-BCA218-4 (2-18GHz)
Kauv kav hlau txais xov yog ib tug broadband kav hlau txais xov nrog ib tug kauv qauv, uas yog yus muaj los ntawm ntau zaus teb thiab high radiation efficiency.Kauv kav hlau txais xov ua tiav polarization ntau haiv neeg thiab dav-band hluav taws xob cov yam ntxwv los ntawm cov qauv ntawm kauv coils, thiab tsim nyog rau radar, satellite kev sib txuas lus thiab kev sib txuas lus wireless.
RM-PSA0756-3 (0.75-6GHz)
RM-PSA 218-2R (2-18GHz)
Yog xav paub ntxiv txog antennas, thov mus saib:
Post lub sij hawm: Jun-14-2024
