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ElektrotehnikaElektromagnetism


elektromagnetlainehelilaineraadiolainevalguslaineelektrijuhistMikrolainetemagnetronradarilmikrolaineahjulTrükkplaadilribaliininduktiivelemendinaresonaatoriks










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Lainejuhe




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Ristkülikukujuline lainejuhe




Elektromagnetlaine lainejuhtmes; elektriväli on x-telje sihiline


Lainejuhe ehk lainejuht on elektromagnetlaine või helilaine edasikandmise kanal. Elektromagnetlaineks võib olla raadiolaine või valguslaine.


Raadiolainet juhib näiteks kahest rööbitisest elektrijuhist koosnev sümmeetriline liin, samuti asümmeetriline liin ehk koaksiaalliin, mis koosneb traatjuhist ja seda ümbritsevast silindrilisest või ristkülikukujulisest välisjuhist.


Mikrolainete juhtimiseks kasutatakse enamasti ristkülikukujulise ristlõikega metalltoru (ilma sisejuhita), mille ristlõike sisemõõtmed on võrreldavad edasikantava laine pikkusega. Niisuguse lainejuhtme puhul on mikrolaineallikaks magnetron, näiteks radaril ja mikrolaineahjul.


Trükkplaadil toimib lainejuhina ribaliin, mille moodustab näiteks vaskfooliumi riba fooliumaluspinnaga trükkplaadil.


Valguslainejuhtmeks on klaasist või plastist kiud, milles laine kulgeb kiu kattekihi sisepinnalt peegeldudes.



Next.svg Pikemalt artiklis Valguskaabel.

Detsimeeterlainete ja kõrgemate sagedustega lainete puhul kasutatakse lainejuhet ka induktiivelemendina, mida nimetatakse siis resonaatoriks.



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