Lub kav hlau txais xov log-periodic yog lub kav hlau txais xov dav dav uas nws txoj haujlwm ua haujlwm yog ua raws li cov qauv resonance thiab log-periodic qauv.Tsab ntawv xov xwm no tseem yuav qhia koj txog cov kav hlau txais xov ntev ntev los ntawm peb yam: keeb kwm, kev ua haujlwm hauv paus ntsiab lus thiab qhov zoo ntawm cov kav hlau txais xov lub sijhawm.

Keeb kwm ntawm log-periodic kav hlau txais xov

Log-periodic kav hlau txais xov yog dav-band kav hlau txais xov uas nws tsim raws li cov qauv log-periodic.Keeb kwm ntawm cov kav hlau txais xov log-periodic hnub rov qab mus rau xyoo 1950.

Lub cav-periodic kav hlau txais xov yog thawj zaug tsim nyob rau hauv 1957 los ntawm American engineers Dwight Isbell thiab Raymond DuHamel.Thaum ua kev tshawb fawb ntawm Bell Labs, lawv tau tsim ib lub kav hlau txais xov dav dav uas muaj peev xwm los npog ntau qhov ntau zaus.Cov qauv kav hlau txais xov no siv lub log-periodic geometry, uas muab nws cov yam ntxwv zoo sib xws ntawm cov hluav taws xob ntau dhau ntawm tag nrho cov zaus.

Nyob rau hauv lub xyoo tom ntej no, log-periodic antennas tau dav siv thiab kawm.Lawv tau siv rau hauv thaj chaw xws li kev sib txuas lus wireless, TV thiab xov tooj cua txais tos, radar systems, xov tooj cua ntsuas, thiab kev tshawb fawb tshawb fawb.Cov yam ntxwv dav dav ntawm cov kav hlau txais xov ntev-ntev ua rau lawv npog ntau zaus bands, txo qhov xav tau kev hloov zaus thiab hloov kav hlau txais xov, thiab txhim kho kev ua haujlwm yooj yim thiab ua haujlwm tau zoo.

Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm log-periodic kav hlau txais xov yog nyob ntawm nws cov qauv tshwj xeeb.Nws muaj ib tug series ntawm alternating hlau daim hlau, txhua nce nyob rau hauv ntev thiab sib nrug raws li ib tug logarithmic lub sij hawm.Cov qauv no ua rau lub kav hlau txais xov tsim cov theem sib txawv ntawm cov zaus sib txawv, yog li ua tiav cov kab hluav taws xob dav dav.

Raws li kev siv thev naus laus zis, kev tsim thiab tsim cov txheej txheem ntawm cov kav hlau txais xov log-periodic tau txhim kho.Niaj hnub nimno log-periodic kav hlau txais xov siv cov khoom siv siab heev thiab cov txheej txheem tsim khoom los txhim kho kav hlau txais xov kev ua tau zoo thiab kev ntseeg tau.

Nws txoj haujlwm ua haujlwm tuaj yeem piav qhia luv luv raws li hauv qab no

1. Resonance hauv paus ntsiab lus: Kev tsim cov kav hlau txais xov log-periodic yog raws li lub hauv paus ntsiab lus ntawm resonance.Ntawm ib lub sijhawm tshwj xeeb, tus qauv ntawm tus kav hlau txais xov yuav tsim lub voj voog resonant, tso cai rau tus kav hlau txais xov kom tau txais txiaj ntsig zoo thiab nthuav tawm cov hluav taws xob hluav taws xob.Los ntawm kev tsim qhov ntev thiab qhov sib txawv ntawm cov ntawv hlau, cov kav hlau txais xov log-periodic tuaj yeem ua haujlwm hauv ntau qhov ntau zaus.

2. Theem sib txawv: Lub log-periodic piv ntawm cov hlau daim ntev thiab qhov sib nrug ntawm lub cav-periodic kav hlau txais xov ua rau txhua daim hlau tsim ib theem sib txawv ntawm ntau zaus.Qhov sib txawv ntawm theem no ua rau tus cwj pwm resonant ntawm tus kav hlau txais xov ntawm ntau zaus, yog li ua kom muaj kev ua haujlwm dav dav.Cov khoom luv luv ntawm cov hlau ua haujlwm ntawm ntau zaus, thaum cov hlau ntev dua ntawm cov zaus qis dua.

3. Beam scanning: Cov qauv ntawm cov kav hlau txais xov log-periodic ua rau nws muaj cov yam ntxwv sib txawv ntawm cov zaus sib txawv.Raws li qhov zaus hloov pauv, cov kev taw qhia hluav taws xob thiab kab dav ntawm lub kav hlau txais xov kuj hloov.Qhov no txhais tau hais tias log-periodic kav hlau txais xov tuaj yeem luam theej duab thiab kho cov kab teeb hla ntau zaus.

Qhov zoo ntawm log-periodic antennas

1. Cov yam ntxwv dav dav: Log-periodic kav hlau txais xov yog lub kav hlau txais xov dav dav uas tuaj yeem npog ntau zaus bands.Nws cov qauv log-periodic ua rau lub kav hlau txais xov kom muaj cov yam ntxwv ntawm cov hluav taws xob zoo sib xws thoob plaws txhua qhov ntau zaus, tshem tawm qhov xav tau kev hloov pauv ntau zaus lossis hloov kav hlau txais xov, txhim kho qhov yooj yim thiab ua haujlwm tau zoo.

2. High nce thiab hluav taws xob efficiency: Log-periodic kav hlau txais xov feem ntau muaj siab nce thiab hluav taws xob efficiency.Nws cov qauv tso cai rau resonance nyob rau hauv ntau qhov ntau zaus, muab cov hluav taws xob muaj zog thiab muaj peev xwm txais tos.

3. Directivity control: Log-periodic antennas feem ntau yog kev taw qhia, uas yog, lawv muaj zog hluav taws xob lossis kev txais tos muaj peev xwm hauv qee cov lus qhia.Qhov no ua rau cov kav hlau txais xov ntev-ntev haum rau cov ntawv thov uas xav tau cov hluav taws xob ncaj qha, xws li kev sib txuas lus, radar, thiab lwm yam.

4. Kev tsim qauv yooj yim: Txij li cov kav hlau txais xov log-periodic tuaj yeem npog ntau qhov ntau zaus, kev tsim qauv tuaj yeem ua kom yooj yim thiab cov kav hlau txais xov tuaj yeem txo tau.Qhov no yuav pab txo cov nqi system, txo qhov nyuaj thiab txhim kho kev ntseeg tau.

5. Anti-interference kev ua tau zoo: Log-periodic kav hlau txais xov muaj kev ua haujlwm zoo los tiv thaiv kev cuam tshuam hauv ntau zaus.Nws cov qauv ua rau lub kav hlau txais xov kom zoo dua lim tawm cov cim tsis xav tau thiab txhim kho lub cev tiv thaiv kev cuam tshuam.

Hauv luv luv, los ntawm kev tsim qhov ntev thiab qhov sib txawv ntawm cov ntawv hlau, lub cav-lub sijhawm kav hlau txais xov tuaj yeem ua haujlwm nyob rau hauv ntau qhov ntau zaus resonant, nrog cov yam ntxwv dav dav, siab nce thiab hluav taws xob efficiency, tswj kev tswj, yooj yim tsim system thiab tiv thaiv kev cuam tshuam. .kev ua tau zoo.Qhov no ua rau logarithmic periodic kav hlau txais xov dav siv hauv kev sib txuas lus wireless, radar, kev tshawb fawb tshawb fawb thiab lwm yam.