Daim duab 1 qhia tau hais tias ib daim duab slotted waveguide, uas muaj ib tug ntev thiab nqaim waveguide qauv nrog ib tug slotted nyob rau hauv nruab nrab. Qhov no tuaj yeem siv los xa cov nthwv dej electromagnetic.

daim duab 1. Geometry ntawm feem ntau slotted waveguide kav hlau txais xov.

Pem hauv ntej-kawg (Y = 0 qhib lub ntsej muag hauv xz dav hlau) kav hlau txais xov yog pub. Qhov kawg kawg yog feem ntau yog luv luv Circuit Court (metallic enclosure). Lub waveguide tej zaum yuav zoo siab los ntawm ib tug luv luv dipole (pom nyob rau sab nraum qab ntawm kab noj hniav qhov kav hlau txais xov) ntawm nplooj ntawv, los yog los ntawm lwm lub waveguide.

Txhawm rau pib txheeb xyuas daim duab 1 kav hlau txais xov, cia peb saib cov qauv hauv Circuit Court. Lub waveguide nws tus kheej ua raws li cov kab sib kis, thiab cov qhov nyob hauv waveguide tuaj yeem raug saib raws li kev sib txuas (parallel) admittances. Lub waveguide yog luv luv, yog li cov qauv kwv yees kwv yees tau pom hauv daim duab 1:

daim duab 2. Circuit Court qauv ntawm slotted waveguide kav hlau txais xov.

Qhov kawg qhov yog qhov deb "d" mus rau qhov kawg (uas yog luv luv, raws li qhia hauv daim duab 2), thiab cov ntsiab lus ntawm qhov sib nrug deb "L" ntawm ib leeg.

Qhov loj ntawm qhov zawj yuav muab cov lus qhia rau lub wavelength. Qhov taw qhia wavelegnth yog lub wavelength nyob rau hauv waveguide. Cov lus qhia wavelength ( ) yog ib qho kev ua haujlwm ntawm qhov dav ntawm lub waveguide ("a") thiab qhov chaw dawb wavelength. Rau qhov tseem ceeb TE01 hom, cov kev taw qhia wavelengths yog:

Qhov kev ncua deb ntawm qhov kawg qhov kawg thiab qhov kawg "d" feem ntau yog xaiv los ua lub quarter wavelength. Lub xeev theoretical ntawm kis kab mob, lub quarter-wavelength luv-circuit impedance kab xa mus rau hauv qab yog qhib Circuit Court. Yog li ntawd, daim duab 2 txo mus rau:

duab 3. Slotted waveguide circuit qauv siv lub quarter-wavelength transformation.

Yog tias parameter "L" raug xaiv los ua ib nrab wavelength, ces cov tswv yim ž ohmic impedance yog saib ntawm ib nrab wavelength nrug z ohms. Qhov "L" yog qhov laj thawj rau kev tsim kom muaj ib nrab ntawm lub wavelength. Yog hais tias lub waveguide slot kav hlau txais xov yog tsim nyob rau hauv no txoj kev, ces tag nrho cov slots yuav suav hais tias parallel. Yog li ntawd, qhov kev nkag mus thiab kev tawm tswv yim impedance ntawm "N" caij slotted array tuaj yeem suav tau sai li sai tau:

Lub input impedance ntawm lub waveguide yog ib txoj haujlwm ntawm qhov impedance.

Thov nco ntsoov tias cov qauv tsim saum toj no tsuas yog siv tau ntawm ib zaus xwb. Raws li qhov zaus tau nce los ntawm qhov ntawd lub waveguide tsim ua haujlwm, yuav muaj kev puas tsuaj hauv kev ua haujlwm ntawm lub kav hlau txais xov. Raws li ib qho piv txwv ntawm kev xav txog cov yam ntxwv zaus ntawm ib qho kev sib tw waveguide, kev ntsuas ntawm tus qauv raws li kev ua haujlwm ntawm zaus yuav tshwm sim hauv S11. Lub waveguide yog tsim los ua haujlwm ntawm 10 GHz. Qhov no yog pub rau coaxial pub rau hauv qab, raws li qhia hauv daim duab 4.

Daim duab 4. Lub kav hlau txais xov waveguide slotted yog pub los ntawm coaxial pub.

Qhov tshwm sim S-parameter zaj lus qhia hauv qab no.

CEEB TOOM: Lub kav hlau txais xov muaj qhov poob loj heev ntawm S11 ntawm txog 10 GHz. Qhov no qhia tau hais tias feem ntau ntawm kev siv hluav taws xob yog radiated ntawm qhov zaus no. Tus kav hlau txais xov bandwidth (yog tias txhais tau tias yog S11 tsawg dua -6 dB) mus txog ntawm 9.7 GHz mus rau 10.5 GHz, muab ib feem ntawm bandwidth ntawm 8%. Nco ntsoov tias kuj tseem muaj qhov cuam tshuam ntawm 6.7 thiab 9.2 GHz. Hauv qab 6.5 GHz, hauv qab qhov kev txiav tawm waveguide zaus thiab yuav luag tsis muaj zog yog tawg. S-parameter zaj duab xis qhia saum toj no muab lub tswv yim zoo ntawm dab tsi bandwidth slotted waveguide zaus cov yam ntxwv zoo ib yam li.

Cov qauv hluav taws xob peb-dimensional ntawm ib qho kev sib tw waveguide yog qhia hauv qab no (qhov no tau suav nrog cov lej electromagnetic pob hu ua FEKO). Qhov nce ntawm lub kav hlau txais xov no yog kwv yees li 17 dB.

Nco ntsoov tias nyob rau hauv XZ dav hlau (H-plane), lub beamwidth yog nqaim heev (2-5 degrees). Nyob rau hauv YZ dav hlau (los yog E-plane), lub beamwidth yog ntau loj.