Antena ya log-periodic ndi antena ya wide-band yomwe mfundo yake yogwirira ntchito imachokera pa resonance ndi kapangidwe ka log-periodic. Nkhaniyi ikudziwitsaninso za antena ya log-periodic kuchokera mbali zitatu: mbiri, mfundo yogwirira ntchito ndi ubwino wa antena ya log-periodic.

Mbiri ya ma antenna a log-periodic

Antena ya Log-periodic ndi antena ya gulu lalikulu yomwe kapangidwe kake kamachokera ku kapangidwe ka log-periodic. Mbiri ya antena ya log-periodic inayamba m'ma 1950.

Antena ya log-periodic idapangidwa koyamba mu 1957 ndi mainjiniya aku America Dwight Isbell ndi Raymond DuHamel. Pochita kafukufuku ku Bell Labs, adapanga antena ya broadband yomwe imatha kuphimba ma frequency band angapo. Kapangidwe ka antena iyi kamagwiritsa ntchito log-periodic geometry, yomwe imapatsa mawonekedwe ofanana a radiation pa ma frequency onse.

M'zaka makumi otsatira, ma antenna a log-periodic akhala akugwiritsidwa ntchito kwambiri komanso kuphunziridwa. Amagwiritsidwa ntchito m'magawo monga kulumikizana opanda zingwe, kulandira wailesi yakanema ndi wailesi, makina a radar, kuyeza wailesi, ndi kafukufuku wasayansi. Makhalidwe a ma antenna a log-periodic omwe ali ndi band yayikulu amawathandiza kuti azitha kuphimba ma frequency band angapo, kuchepetsa kufunikira kosintha ma frequency ndi kusintha ma antenna, komanso kukonza kusinthasintha ndi magwiridwe antchito a makina.

Mfundo yogwirira ntchito ya antenna ya log-periodic imachokera ku kapangidwe kake kapadera. Imakhala ndi mbale zingapo zachitsulo zosinthika, chilichonse chikuwonjezeka kutalika ndi malo malinga ndi nthawi ya logarithmic. Kapangidwe kameneka kamapangitsa antenna kupanga kusiyana kwa magawo pama frequency osiyanasiyana, motero kupeza kuwala kwa wide-band.

Pamene ukadaulo ukupita patsogolo, njira zopangira ndi kupanga ma antenna a log-periodic zapita patsogolo. Ma antenna amakono a log-periodic amagwiritsa ntchito zipangizo zamakono komanso njira zopangira kuti akonze magwiridwe antchito ndi kudalirika kwa ma antenna.

Mfundo yake yogwirira ntchito ingathe kufotokozedwa mwachidule motere:

1. Mfundo ya Resonance: Kapangidwe ka antenna ya log-periodic kamadalira mfundo ya resonance. Pafupipafupi inayake, kapangidwe ka antenna kamapanga resonant loop, zomwe zimathandiza antenna kulandira bwino ndi kutulutsa mafunde a electromagnetic. Mwa kupanga bwino kutalika ndi malo a mapepala achitsulo, antenna za log-periodic zimatha kugwira ntchito m'magawo angapo a resonant frequency.

2. Kusiyana kwa magawo: Chiŵerengero cha log-periodic cha kutalika kwa chidutswa chachitsulo ndi mtunda wa antenna ya log-periodic chimapangitsa chidutswa chilichonse chachitsulo kupanga kusiyana kwa magawo pamafupikidwe osiyanasiyana. Kusiyana kwa magawo kumeneku kumabweretsa khalidwe la resonant la antenna pamafupikidwe osiyanasiyana, motero zimathandiza kuti ntchito ya band yotakata igwire ntchito. Zidutswa zazifupi zachitsulo zimagwira ntchito pamafupikidwe apamwamba, pomwe zidutswa zazitali zachitsulo zimagwira ntchito pamafupikidwe otsika.

3. Kusanthula kwa Beam: Kapangidwe ka antenna ya log-periodic kamapangitsa kuti ikhale ndi mawonekedwe osiyanasiyana a radiation pama frequency osiyanasiyana. Pamene ma frequency akusintha, njira ya radiation ndi m'lifupi mwa antenna zimasinthanso. Izi zikutanthauza kuti antenna za log-periodic zimatha kusanthula ndikusintha ma ray pa wide frequency band.

Ubwino wa ma antenna a log-periodic

1. Makhalidwe a Broadband: Antena ya Log-periodic ndi antena ya wide-band yomwe imatha kuphimba ma frequency band angapo. Kapangidwe kake ka log-periodic kamathandiza antena kukhala ndi ma radiation ofanana m'ma frequency range onse, kuchotsa kufunikira kosintha ma frequency kapena kusintha antena, ndikuwonjezera kusinthasintha ndi magwiridwe antchito a dongosolo.

2. Kuchuluka kwa mphamvu ya radiation: Ma antenna a Log-periodic nthawi zambiri amakhala ndi mphamvu yamphamvu ya radiation. Kapangidwe kake kamalola kumveka bwino m'magawo osiyanasiyana a ma frequency, zomwe zimapangitsa kuti ma radiation akhale amphamvu komanso olandirira bwino.

3. Kuwongolera Malangizo: Ma antenna a log-periodic nthawi zambiri amakhala ndi mphamvu zowunikira, kutanthauza kuti, ali ndi mphamvu zowunikira kwambiri kapena zolandirira mbali zina. Izi zimapangitsa ma antenna a log-periodic kukhala oyenera kugwiritsa ntchito omwe amafunikira malangizo enaake a kuwala, monga kulumikizana, radar, ndi zina zotero.

4. Fewetsani kapangidwe ka makina: Popeza ma antenna a log-periodic amatha kugwira ntchito zosiyanasiyana, kapangidwe ka makina kangathe kuchepetsedwa ndipo chiwerengero cha ma antenna chingachepe. Izi zimathandiza kuchepetsa mtengo wa makina, kuchepetsa zovuta komanso kulimbitsa kudalirika.

5. Kugwira ntchito koletsa kusokoneza: Antena ya Log-periodic ili ndi ntchito yabwino yoletsa kusokoneza mu bandeji yayikulu ya ma frequency. Kapangidwe kake kamathandiza kuti antena ichotse bwino ma frequency osafunikira ndikuwonjezera kukana kwa makinawo ku kusokoneza.

Mwachidule, pokonza molondola kutalika ndi mtunda wa mapepala achitsulo, antenna ya log-periodic imatha kugwira ntchito m'magawo angapo a ma frequency a resonant, yokhala ndi mawonekedwe a wide-band, high gain ndi radiation efficiency, directivity control, losavuta kapangidwe ka makina komanso ubwino wotsutsana ndi kusokoneza. Izi zimapangitsa kuti ma antenna a logarithmic periodic agwiritsidwe ntchito kwambiri mu kulumikizana opanda zingwe, radar, kafukufuku wasayansi ndi madera ena.