Mlongoti wa log-periodic ndi mlongoti wamagulu ambiri omwe mfundo zake zogwirira ntchito zimachokera ku resonance ndi log-periodic structure. Nkhaniyi ikuwonetsaninso za tinyanga ta log-periodic kuchokera kuzinthu zitatu: mbiri, mfundo zogwirira ntchito komanso ubwino wa tinyanga ta log-periodic.

Mbiri ya antennas a log-periodic

Log-periodic antenna ndi mlongoti wamagulu ambiri omwe mapangidwe ake amatengera mawonekedwe a log-periodic. Mbiri ya antennas a log-periodic idayamba m'ma 1950s.

Antenna ya log-periodic idapangidwa koyamba mu 1957 ndi mainjiniya aku America Dwight Isbell ndi Raymond DuHamel. Pochita kafukufuku ku Bell Labs, adapanga mlongoti wa Broadband wotha kuphimba ma frequency angapo. Kapangidwe ka antenna kameneka kamagwiritsa ntchito geometry ya log-periodic, yomwe imapatsa mawonekedwe ofanana ndi ma radiation pama frequency onse.

M'zaka makumi angapo zotsatira, tinyanga ta log-periodic zakhala zikugwiritsidwa ntchito kwambiri ndikuphunziridwa. Amagwiritsidwa ntchito m'malo monga mauthenga opanda zingwe, kulandila wailesi yakanema ndi wailesi, makina a radar, kuyeza kwa wailesi, ndi kafukufuku wasayansi. Mawonekedwe amtundu wa antennas a log-periodic antennas amawathandiza kuti azitha kuphimba ma frequency angapo, kuchepetsa kufunika kosintha pafupipafupi ndikusintha mlongoti, ndikuwongolera kusinthasintha kwadongosolo komanso kuchita bwino.

Mfundo yogwirira ntchito ya antenna ya log-periodic imachokera ku mapangidwe ake apadera. Zimapangidwa ndi zitsulo zotsatizana zosinthana, iliyonse ikuwonjezeka m'litali ndi katalikirana malinga ndi nthawi ya logarithmic. Kapangidwe kameneka kamapangitsa kuti mlongoti upangitse kusiyana kwa magawo pama frequency osiyanasiyana, motero amapeza ma radiation ambiri.

Pamene ukadaulo ukupita patsogolo, mapangidwe ndi njira zopangira ma log-periodic antennas zapita patsogolo. Ma antenna amakono a log-periodic antennas amagwiritsa ntchito zida zapamwamba komanso njira zopangira kuti apititse patsogolo magwiridwe antchito komanso kudalirika.

Mfundo yake yogwirira ntchito ikhoza kufotokozedwa mwachidule motere

1. Resonance mfundo: Mapangidwe a log-periodic antenna amachokera pa mfundo ya resonance. Pafupipafupi, mawonekedwe a mlongoti amapanga loop yolumikizira, kulola kuti mlongotiyo ulandire bwino ndikuwunikira mafunde a electromagnetic. Mwa kupanga ndendende kutalika ndi katalikirana kwa mapepala achitsulo, tinyanga ta log-periodic zimatha kugwira ntchito mosiyanasiyana mosiyanasiyana.

2. Kusiyana kwa gawo: Chiŵerengero cha log-periodic cha kutalika kwa chidutswa chachitsulo ndi malo a mlongoti wa log-periodic antenna amachititsa kuti chitsulo chilichonse chipange kusiyana kwa magawo osiyanasiyana. Kusiyana kwa gawoli kumabweretsa kumveka kwa mlongoti pamayendedwe osiyanasiyana, motero kumathandizira kugwira ntchito kwamagulu ambiri. Zitsulo zazifupi zimagwira pamafuriji apamwamba, pomwe zitsulo zazitali zimagwira pama frequency otsika.

3. Kusanthula kwamitengo: Mapangidwe a mlongoti wa log-periodic amapangitsa kuti ikhale ndi mawonekedwe osiyanasiyana a radiation pama frequency osiyanasiyana. Pamene mafupipafupi akusintha, momwe ma radiation amayendera komanso kukula kwa mlongoti kumasinthanso. Izi zikutanthauza kuti tinyanga ta log-periodic zimatha kusanthula ndikusintha matabwa pa bandi yayikulu.

Ubwino wa antennas a log-periodic

1. Makhalidwe a Broadband: Log-periodic antenna ndi mlongoti wamagulu ambiri omwe amatha kuphimba ma frequency angapo. Kapangidwe kake ka log-periodic kumathandizira kuti mlongoti ukhale ndi mawonekedwe ofanana ndi ma radiation pamitundu yonse ya ma frequency, kuthetsa kufunikira kwa kusintha kwafupipafupi kapena kusintha kwa antenna, kuwongolera kusinthika kwadongosolo komanso kuchita bwino.

2. Kupindula kwakukulu komanso kugwiritsa ntchito bwino kwa radiation: Tinyanga za Log-periodic nthawi zambiri zimakhala ndi phindu lalikulu komanso kugwiritsa ntchito bwino kwa radiation. Kapangidwe kake kamalola kuti ma resonance azitha kuyenda pafupipafupi, kupereka mphamvu zochulukirapo komanso kulandila.

3. Kuwongolera Directivity: Tinyanga za Log-periodic nthawi zambiri zimakhala zolunjika, ndiko kuti, zimakhala ndi ma radiation amphamvu kapena kulandirira mbali zina. Izi zimapangitsa tinyanga ta log-periodic kukhala zoyenera kugwiritsa ntchito zomwe zimafuna kuwongolera kwapadera kwa ma radiation, monga kulumikizana, radar, ndi zina.

4. Yambitsani kamangidwe kadongosolo: Popeza kuti tinyanga ta log-periodic zimatha kuphimba mafupipafupi osiyanasiyana, mapangidwe adongosolo amatha kukhala osavuta komanso kuchuluka kwa tinyanga kumatha kuchepetsedwa. Izi zimathandiza kuchepetsa mtengo wa dongosolo, kuchepetsa zovuta komanso kukonza kudalirika.

5. Ntchito yoletsa kusokoneza: Log-periodic antenna imakhala ndi ntchito yabwino yotsutsana ndi kusokoneza mu gulu lafupipafupi. Mapangidwe ake amathandizira kuti mlongoti uzitha kusefa bwino ma siginecha osafunikira ndikuwongolera kukana kwadongosolo kusokonezedwa.

Mwachidule, popanga molondola kutalika ndi kutalika kwa mapepala achitsulo, mlongoti wa log-periodic ukhoza kugwira ntchito mumayendedwe angapo omveka, okhala ndi mawonekedwe a gulu lonse, kupindula kwakukulu ndi mphamvu ya ma radiation, kuwongolera kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe kake. . ntchito zabwino. Izi zimapangitsa kuti ma logarithmic periodic antennas azigwiritsidwa ntchito kwambiri pamalumikizidwe opanda zingwe, radar, kafukufuku wasayansi ndi magawo ena.