Traveling wave tube with non-reciprocal attenuating adjunct

Details Traveling wave tube with non-reciprocal attenuating adjunct Traveling wave tube with non-reciprocal attenuating adjunct

H - Electricity

01

J

353/9

H01J 25/34 (2006.01) H01J 23/30 (2006.01)

Patent

CA 1139444

PATENT APPLICATION of ARTHUR KARP for TRAVELING WAVE TUBE WITH NON-RECIPROCAL ATTENUATING ADJUNCT Abstract Oscillations due to backward waves in a high-power traveling-wave tube (TWT) are inhibited by a non-reciprocal attenuating device which essentially absorbs only backward waves. A directional coupler mediates the exchange of energy between the TWT interaction circuit and an external circuit containing a non-reciprocal loss element such as a ferrite isolator. In such embodiments the high- frequency power handled by the isolator is much less than the power in the TWT interaction circuit. The frequency band handled by the isolator is much narrower than that handled by the TWT. Coupling to the loss element is through one or more resonant circuit elements such that a "notch" of attenuation is obtained for a backward wave only, at a certain frequency where oscillations are prone, such as the frequency associated with 2.pi. phase shift per cavity in a coalesced-mode coupled-cavity TWT. lrksrbnll2778 - 1 - 78-56

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