Nyob rau hauv lub microwave circuits los yog systems, tag nrho cov circuits los yog system feem ntau yog tsim los ntawm ntau yam yooj yim microwave li xws li cov ntxaij lim dej, couplers, hwj chim dividers, thiab lwm yam. lwm nrog tsawg kawg nkaus poob;
Nyob rau hauv tag nrho lub tsheb radar system, lub zog hloov dua siab tshiab feem ntau cuam tshuam nrog kev hloov ntawm lub zog los ntawm cov nti mus rau lub feeder ntawm PCB pawg thawj coj saib, kev hloov ntawm lub feeder mus rau lub kav hlau txais xov lub cev, thiab lub zog hluav taws xob ntawm lub kav hlau txais xov.Hauv tag nrho cov txheej txheem hloov hluav taws xob, ib feem tseem ceeb yog qhov tsim ntawm lub converter.Cov converters nyob rau hauv millimeter yoj tshuab feem ntau suav nrog microstrip rau substrate integrated waveguide (SIW) conversion, microstrip rau waveguide conversion, SIW rau waveguide conversion, coaxial rau waveguide conversion, waveguide rau waveguide conversion thiab ntau hom waveguide conversion.Qhov teeb meem no yuav tsom mus rau microband SIW hloov dua siab tshiab tsim.
Ntau hom kev thauj mus los
Microstripyog ib qho ntawm cov kev qhia siv dav tshaj plaws ntawm cov microwave frequencies tsawg.Nws cov txiaj ntsig tseem ceeb yog cov qauv yooj yim, tus nqi qis thiab kev koom ua ke siab nrog cov khoom siv saum npoo av.Ib txoj kab microstrip raug tsim los siv cov conductors ntawm ib sab ntawm lub dielectric txheej substrate, tsim ib lub dav hlau hauv av rau sab nraud, nrog huab cua saum nws.Sab saum toj tus neeg xyuas pib yog ib qho khoom siv hluav taws xob (feem ntau yog tooj liab) zoo li tus xaim nqaim.Kab dav, thickness, txheeb ze permittivity, thiab dielectric poob tangent ntawm lub substrate yog ib qho tseem ceeb tsis.Tsis tas li ntawd, lub thickness ntawm tus neeg xyuas pib (piv txwv li, metallization thickness) thiab conductivity ntawm tus neeg xyuas pib kuj tseem ceeb heev ntawm ntau zaus.Los ntawm kev ua tib zoo xav txog cov kev txwv no thiab siv cov kab microstrip raws li qhov yooj yim chav tsev rau lwm yam khoom siv, ntau cov khoom siv microwave thiab cov khoom siv tuaj yeem tsim tau, xws li cov ntxaij lim dej, couplers, fais fab faib/combiners, mixers, thiab lwm yam. Txawm li cas los xij raws li qhov zaus nce (thaum tsiv mus rau microwave frequencies kuj siab heev) kis tau tus mob poob nce thiab hluav taws xob tshwm sim.Yog li ntawd, hollow tube waveguides xws li cov duab plaub waveguides yog qhov zoo dua vim tias qhov poob me me ntawm ntau zaus (tsis muaj hluav taws xob).Sab hauv ntawm lub waveguide feem ntau yog huab cua.Tab sis yog tias xav tau, nws tuaj yeem ua tiav nrog cov khoom siv dielectric, muab nws me me hla ntu dua li cov lus qhia uas muaj roj.Txawm li cas los xij, hollow tube waveguides feem ntau loj, tuaj yeem hnyav tshwj xeeb tshaj yog nyob rau hauv qis zaus, yuav tsum tau tsim ntau dua thiab raug nqi, thiab tsis tuaj yeem ua ke nrog cov qauv luam tawm.
RFMISO MICROSTRIP ANTENNA khoom:
RM-MA25527-22,25.5-27GHz
RM-MA425435-22,4.25-4.35GHz
Lwm qhov yog cov qauv qhia kev sib txuas ntawm cov qauv microstrip thiab waveguide, hu ua substrate integrated waveguide (SIW).Ib qho SIW yog ib qho kev sib xyaw ua ke zoo li cov qauv siv hluav taws xob tsim los ntawm cov khoom siv dielectric, nrog cov neeg siv hluav taws xob sab saum toj thiab hauv qab thiab cov kab tawm ntawm ob lub hlau vias tsim cov phab ntsa.Piv nrog microstrip thiab waveguide qauv, SIW yog tus nqi tsim nyog, muaj cov txheej txheem tsim khoom yooj yim, thiab tuaj yeem ua ke nrog cov cuab yeej siv.Tsis tas li ntawd, qhov kev ua tau zoo ntawm cov frequencies siab zoo dua li ntawm cov qauv microstrip thiab muaj cov khoom sib txawv ntawm cov waveguide dispersion.Raws li pom hauv daim duab 1;
SIW Design Guidelines
Substrate integrated waveguides (SIWs) yog kev sib xyaw ua ke waveguide zoo li cov qauv tsim los ntawm kev siv ob kab ntawm cov hlau vias embedded nyob rau hauv ib tug dielectric txuas ob parallel hlau daim hlau.Kab hlau los ntawm qhov ua rau sab phab ntsa.Cov qauv no muaj cov yam ntxwv ntawm microstrip kab thiab waveguides.Cov txheej txheem tsim khoom kuj zoo ib yam li lwm cov qauv luam ntawv tiaj tus.Ib tug raug SIW geometry yog qhia nyob rau hauv daim duab 2.1, qhov twg nws dav (piv txwv li kev sib cais ntawm vias nyob rau hauv lub lateral kev taw qhia (raws li)), txoj kab uas hla ntawm lub vias (d) thiab lub suab ntev (p) yog siv los tsim lub SIW qauv. Qhov tseem ceeb tshaj plaws geometric parameters (daim duab 2.1) yuav piav qhia nyob rau hauv seem tom ntej.Nco ntsoov tias hom tseem ceeb yog TE10, ib yam li lub voj voos xwm txheej.Kev sib raug zoo ntawm kev txiav tawm zaus fc ntawm huab cua puv waveguides (AFWG) thiab dielectric-filled waveguides (DFWG) thiab qhov ntev a thiab b yog thawj qhov chaw ntawm SIW tsim.Rau cov huab cua puv waveguides, qhov kev txiav tawm zaus yog raws li qhia hauv cov qauv hauv qab no
SIW cov qauv tsim thiab cov qauv kev suav[1]
qhov twg c yog qhov ceev ntawm lub teeb hauv qhov chaw dawb, m thiab n yog cov qauv, a yog qhov ntev waveguide loj, thiab b yog qhov luv waveguide loj.Thaum lub waveguide ua haujlwm hauv TE10 hom, nws tuaj yeem yooj yim rau fc = c/2a;Thaum lub waveguide tau sau nrog dielectric, qhov ntev ntev a yog xam los ntawm ad = a / Sqrt (εr), qhov twg εr yog dielectric qhov nruab nrab ntawm qhov nruab nrab;Txhawm rau ua kom SIW ua haujlwm hauv TE10 hom, los ntawm qhov sib nrug p, txoj kab uas hla d thiab sab dav raws li yuav tsum ua kom haum cov qauv ntawm sab xis ntawm daim duab hauv qab no, thiab tseem muaj cov qauv qauv ntawm d<λg thiab p<2d [ 2];
qhov twg λg yog cov coj yoj wavelength: Tib lub sij hawm, lub thickness ntawm lub substrate yuav tsis cuam tshuam rau SIW loj tsim, tab sis nws yuav cuam tshuam qhov poob ntawm cov qauv, yog li qhov tsawg-poob qhov zoo ntawm high-thickness substrates yuav tsum tau txiav txim siab. .
Převod SWV na Microstrip
Thaum lub microstrip qauv yuav tsum tau txuas nrog SIW, kev hloov pauv ntawm microstrip tapered yog ib qho ntawm cov kev hloov pauv tseem ceeb, thiab kev hloov pauv feem ntau muab kev sib tw dav dav piv rau lwm qhov kev hloov pauv.Cov qauv kev hloov pauv tau tsim tau zoo muaj qhov cuam tshuam tsawg heev, thiab qhov poob qis feem ntau yog tshwm sim los ntawm dielectric thiab conductor poob.Kev xaiv cov khoom siv substrate thiab cov neeg xyuas pib feem ntau txiav txim siab qhov kev hloov pauv.Txij li thaum lub thickness ntawm lub substrate cuam tshuam qhov dav ntawm cov kab microstrip, cov kev hloov ntawm tapered yuav tsum tau kho thaum lub thickness ntawm substrate hloov.Lwm hom grounded coplanar waveguide (GCPW) kuj yog ib txoj kab uas siv dav hauv cov tshuab siv ntau zaus.Sab conductors nyob ze rau cov kab nruab nrab kis tau tus mob kuj ua rau hauv av.Los ntawm kev kho qhov dav ntawm lub ntsiab feeder thiab qhov sib txawv rau sab hauv av, qhov yuav tsum tau muaj cov yam ntxwv impedance tuaj yeem tau txais.
Microstrip rau SIW thiab GCPW rau SIW
Daim duab hauv qab no yog ib qho piv txwv ntawm kev tsim microstrip rau SIW.Qhov nruab nrab siv yog Rogers3003, qhov dielectric tas li yog 3.0, qhov tseeb poob tus nqi yog 0.001, thiab lub thickness yog 0.127 hli.Lub feeder dav ntawm ob qho kawg yog 0.28mm, uas phim qhov dav ntawm tus kav hlau txais xov feeder.Txoj kab uas hla ntawm lub qhov yog d = 0.4mm, thiab qhov sib nrug p = 0.6mm.Qhov loj me me yog 50mm * 12mm * 0.127mm.Qhov kev poob tag nrho hauv passband yog li ntawm 1.5dB (uas tuaj yeem txo qis ntxiv los ntawm kev ua kom zoo dua qhov sib txawv ntawm qhov dav).
SIW qauv thiab nws cov S tsis
Fais fab kev faib tawm @ 79GHz
Post lub sij hawm: Jan-18-2024
