Title
Einfhrung in die Mikrowellenphysik (Wissenschaftliche Forschungsberichte) (German Edition),Used
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37 und wird bei der Grenzwellenlange unendlich groft Die Phasengeschwindigkeit der Hohl rohrwelle in zRichtung ist mit groGer als die Lichtgeschwindigkeit Co im Vakuum. Ein Sill 11 Wellen berg der schrag auf die Seitenwande auftreffenden Planwelle lauft langs der Wand eben sehr viel schneller als in der Ausbreitungsrichtung der Planwelle. Mit einer veranderlichen elektrischen Feldstarke ist aber immer eine magnetische Feld starke verbunden, die in der erzeugenden Planwelle, wie schon in der EinfUhrung erwahnt, senkrecht zur elektrischen steht. FUr ebene Wellen gilt im Vakuum H = 1 r;; E V 110 (vergl. II 7). Hier ist H in die Komponenten Hx und H, zu zerlegen, fUr die an der tall wand verschiedene Grenzbedingungen bestehen. Hx muG als senkrechte Komponente verschwinden, so daB sie unter dem Phasensprung rrreflektiert wird, wahrend H, endliche Werte an der Oberflache und daher keinen Phasensprung bei der Reflexion hat. In einem Punkt des Hohlrohres ist die resultierende magnetische Feldstarke dann wieder die Summe von einfallender und reflektierter Welle: (II,2b) Damit erhalten wir das gesamte Feldlinienbild der Hohlrohrwelle, wie es in Abb. 20 im Langs und Querschnitt des Hohlleiters gezeichnet ist. Die Hohlrohrwelle hat im Gegen satz zur Planwelle im freien Raum auch longitudinale Felder, hier speziell magnetische. z _ a __ _ b. =_ _: . y x 1"1 Abb. 20. HoWelle im Rechteckrohr. EI. Feldlinien ausgezogen, magn. gestrichelt .
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This warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
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