Hauv cov voj voog microwave lossis cov kab ke, tag nrho lub voj voog lossis lub kaw lus feem ntau yog tsim los ntawm ntau yam khoom siv microwave yooj yim xws li cov lim dej, cov khoom sib txuas, cov khoom faib hluav taws xob, thiab lwm yam. Nws tau cia siab tias los ntawm cov khoom siv no, nws muaj peev xwm xa cov teeb liab hluav taws xob los ntawm ib qho mus rau lwm qhov nrog qhov poob tsawg kawg nkaus;
Hauv tag nrho lub tsheb radar system, kev hloov pauv zog feem ntau yog kev hloov pauv zog los ntawm lub chip mus rau lub feeder ntawm PCB board, kev hloov pauv ntawm lub feeder mus rau lub cev antenna, thiab kev siv zog zoo los ntawm lub antenna. Hauv tag nrho cov txheej txheem hloov pauv zog, ib feem tseem ceeb yog kev tsim lub converter. Cov converters hauv millimeter wave systems feem ntau suav nrog microstrip mus rau substrate integrated waveguide (SIW) conversion, microstrip mus rau waveguide conversion, SIW mus rau waveguide conversion, coaxial mus rau waveguide conversion, waveguide mus rau waveguide conversion thiab ntau hom kev hloov pauv waveguide. Qhov teeb meem no yuav tsom mus rau microband SIW conversion design.
Ntau hom kev thauj mus los sib txawv
Microstripyog ib qho ntawm cov qauv qhia siv dav tshaj plaws ntawm cov zaus microwave qis. Nws cov txiaj ntsig tseem ceeb yog cov qauv yooj yim, tus nqi qis thiab kev sib koom ua ke nrog cov khoom siv ntawm qhov chaw. Ib txoj kab microstrip feem ntau yog tsim los ntawm kev siv cov conductors ntawm ib sab ntawm cov txheej dielectric substrate, tsim ib lub dav hlau hauv av ntawm sab tod, nrog cua saum toj nws. Tus conductor sab saum toj yog qhov khoom siv conductive (feem ntau yog tooj liab) zoo li hauv ib txoj hlau nqaim. Qhov dav ntawm txoj kab, tuab, permittivity txheeb ze, thiab dielectric poob tangent ntawm lub substrate yog cov yam ntxwv tseem ceeb. Tsis tas li ntawd, qhov tuab ntawm tus conductor (piv txwv li, metallization tuab) thiab conductivity ntawm tus conductor kuj tseem ceeb ntawm cov zaus siab dua. Los ntawm kev ua tib zoo xav txog cov yam ntxwv no thiab siv cov kab microstrip ua lub hauv paus rau lwm yam khoom siv, ntau cov khoom siv microwave luam tawm thiab cov khoom siv tuaj yeem tsim, xws li cov lim dej, couplers, fais fab faib / combiners, mixers, thiab lwm yam. Txawm li cas los xij thaum zaus nce (thaum txav mus rau cov zaus microwave siab dua) kev poob kis nce thiab kev tawg tshwm sim. Yog li ntawd, cov raj hollow waveguides xws li cov waveguides rectangular yog qhov nyiam vim muaj kev poob me me ntawm cov zaus siab dua (tsis muaj hluav taws xob). Sab hauv ntawm waveguide feem ntau yog huab cua. Tab sis yog tias xav tau, nws tuaj yeem raug ntim nrog cov khoom siv dielectric, ua rau nws me dua li cov roj-filled waveguide. Txawm li cas los xij, cov raj hollow waveguides feem ntau yog bulky, tuaj yeem hnyav tshwj xeeb tshaj yog ntawm cov zaus qis dua, xav tau cov kev xav tau ntau dua thiab kim, thiab tsis tuaj yeem koom ua ke nrog cov qauv luam tawm planar.
RFMISO MICROSTRIP ANTENNA KHOOM:
RM-MA25527-22,25.5-27GHz
RM-MA425435-22,4.25-4.35GHz
Qhov thib ob yog ib qho kev sib xyaw ua ke ntawm cov qauv microstrip thiab waveguide, hu ua substrate integrated waveguide (SIW). SIW yog ib qho kev sib xyaw ua ke zoo li waveguide uas ua los ntawm cov khoom siv dielectric, nrog cov conductors nyob rau sab saum toj thiab hauv qab thiab ib qho linear array ntawm ob lub hlau vias tsim cov sidewalls. Piv nrog rau microstrip thiab waveguide structures, SIW yog tus nqi tsim nyog, muaj cov txheej txheem tsim khoom yooj yim, thiab tuaj yeem koom ua ke nrog cov khoom siv planar. Tsis tas li ntawd, kev ua tau zoo ntawm cov zaus siab zoo dua li ntawm microstrip structures thiab muaj cov khoom sib cais waveguide. Raws li pom hauv Daim Duab 1;
Cov lus qhia tsim qauv SIW
Cov waveguides sib xyaw ua ke hauv substrate (SIWs) yog cov qauv waveguide zoo li cov qauv uas tsim los ntawm kev siv ob kab ntawm cov hlau vias uas muab tso rau hauv ib qho dielectric txuas ob lub phaj hlau sib luag. Cov kab ntawm cov hlau hla qhov tsim cov phab ntsa sab. Cov qauv no muaj cov yam ntxwv ntawm cov kab microstrip thiab waveguides. Cov txheej txheem tsim khoom kuj zoo ib yam li lwm cov qauv luam tawm tiaj tus. Ib qho geometry SIW ib txwm muaj nyob rau hauv Daim Duab 2.1, qhov twg nws qhov dav (piv txwv li qhov sib cais ntawm vias hauv qhov kev taw qhia sab nraud (as)), txoj kab uas hla ntawm vias (d) thiab qhov ntev ntawm lub suab (p) yog siv los tsim cov qauv SIW. Cov kev ntsuas geometric tseem ceeb tshaj plaws (qhia hauv Daim Duab 2.1) yuav piav qhia hauv ntu tom ntej. Nco ntsoov tias hom tseem ceeb yog TE10, ib yam li cov waveguide rectangular. Kev sib raug zoo ntawm qhov zaus txiav fc ntawm cov waveguides uas muaj cua puv (AFWG) thiab cov waveguides uas muaj dielectric puv (DFWG) thiab qhov ntev a thiab b yog thawj qhov ntawm SIW tsim. Rau cov waveguides uas muaj cua puv, qhov zaus txiav yog raws li qhia hauv cov mis hauv qab no.
SIW cov qauv yooj yim thiab cov qauv xam zauv [1]
qhov twg c yog qhov ceev ntawm lub teeb hauv qhov chaw dawb, m thiab n yog cov hom, a yog qhov ntev ntawm waveguide, thiab b yog qhov luv dua ntawm waveguide. Thaum lub waveguide ua haujlwm hauv hom TE10, nws tuaj yeem yooj yim rau fc = c / 2a; thaum lub waveguide puv nrog dielectric, qhov ntev ntawm sab nraud a yog xam los ntawm ad = a / Sqrt (εr), qhov twg εr yog qhov dielectric tas li ntawm nruab nrab; txhawm rau ua kom SIW ua haujlwm hauv hom TE10, qhov sib nrug ntawm qhov p, txoj kab uas hla d thiab sab dav raws li yuav tsum ua kom txaus siab rau cov mis ntawm sab xis saum toj ntawm daim duab hauv qab no, thiab tseem muaj cov mis empirical ntawm d <λg thiab p <2d [2];
qhov twg λg yog qhov wavelength ntawm nthwv dej coj: Tib lub sijhawm, qhov tuab ntawm lub substrate yuav tsis cuam tshuam rau qhov tsim SIW loj, tab sis nws yuav cuam tshuam rau qhov poob ntawm cov qauv, yog li qhov zoo ntawm kev poob qis ntawm cov substrates tuab siab yuav tsum tau xav txog.
Převod MICROSTRIP na SIW
Thaum ib lub qauv microstrip xav tau txuas nrog SIW, qhov kev hloov pauv microstrip tapered yog ib qho ntawm cov txheej txheem hloov pauv tseem ceeb, thiab qhov kev hloov pauv tapered feem ntau muab qhov sib phim dav dav piv rau lwm cov kev hloov pauv luam tawm. Ib lub qauv hloov pauv uas tsim tau zoo muaj qhov cuam tshuam tsawg heev, thiab qhov poob ntawm kev ntxig yog feem ntau yog los ntawm kev poob dielectric thiab conductor. Kev xaiv cov khoom siv substrate thiab conductor feem ntau txiav txim siab qhov poob ntawm kev hloov pauv. Txij li thaum qhov tuab ntawm lub substrate cuam tshuam qhov dav ntawm kab microstrip, cov kev teeb tsa ntawm qhov kev hloov pauv tapered yuav tsum tau kho thaum qhov tuab ntawm lub substrate hloov pauv. Lwm hom grounded coplanar waveguide (GCPW) kuj yog ib qho qauv kab xa xov siv dav hauv cov kab ke siab. Cov conductors sab ze rau kab xa xov nruab nrab kuj ua haujlwm ua av. Los ntawm kev kho qhov dav ntawm lub feeder tseem ceeb thiab qhov sib txawv rau thaj av sab, qhov impedance yam ntxwv xav tau tuaj yeem tau txais.
Microstrip rau SIW thiab GCPW rau SIW
Daim duab hauv qab no yog ib qho piv txwv ntawm kev tsim cov microstrip rau SIW. Cov khoom siv nruab nrab yog Rogers3003, qhov dielectric constant yog 3.0, qhov poob tiag tiag yog 0.001, thiab qhov tuab yog 0.127mm. Qhov dav ntawm ob qho kawg yog 0.28mm, uas phim qhov dav ntawm lub antenna feeder. Lub qhov hla txoj kab uas hla yog d = 0.4mm, thiab qhov sib nrug p = 0.6mm. Qhov loj me simulation yog 50mm * 12mm * 0.127mm. Qhov poob tag nrho hauv passband yog li 1.5dB (uas tuaj yeem txo qis ntxiv los ntawm kev ua kom zoo dua qhov sib nrug dav).
Cov qauv SIW thiab nws cov kev cai S
Kev faib hluav taws xob hauv thaj chaw 79GHz
Lub sijhawm tshaj tawm: Lub Ib Hlis-18-2024
