. The Bell System technical journal . nience, and for theconfiguration shown may be made to couple to any TE mode of the roundguide. Input power at entry 1 may be transferred in whole or in part tothe selected mode at entry 4, the remaining portion of the power appear-ing at entry 2. Very little power in any mode will appear at entry 3 forexcitation at 1, and very little power in undesired modes will appear atentry 4. Thus the structure has the h3^brid property in addition to beingmode selective. A matched impedance is presented at all entries to allmodes over a very broad frequency band. Rece
. The Bell System technical journal . nience, and for theconfiguration shown may be made to couple to any TE mode of the roundguide. Input power at entry 1 may be transferred in whole or in part tothe selected mode at entry 4, the remaining portion of the power appear-ing at entry 2. Very little power in any mode will appear at entry 3 forexcitation at 1, and very little power in undesired modes will appear atentry 4. Thus the structure has the h3^brid property in addition to beingmode selective. A matched impedance is presented at all entries to allmodes over a very broad frequency band. Recently, coupled transmission lines have found use as input and out-put circuits for travelling-wave tubes. In this instance a helical input(or output) line was electromagnetically coupled to the travelling-wave-tube helix, with conditions adjusted for complete energy transfer be-tween the helices. The result is an input-output circuit requiring nometallic connection to the tube helix and requiring no connection through COUPLINGAPERTURE. 3 Fig. 1 — Coupled transmission line transducer. COUILKI) WAVK THKOKY AM) WA V Kdll I)l: A TlLlCATIOXS G03 the vacuum seal. R. Kompfner conceived this form of connection totravelling-waxe tubes while working Avith the Admiralty in England,and demonstrated the usefulness of the idea here at the work was done by the group at the Ele(;tronics Research Lab-oratory at Stanford University, and was described by S. T. Kaisel atthe August, 1953, West Coast Convention. Both groups re-(|uested pre-publication copies of this paper for use in their research. LOOSE COUPLING THEORY On the assumption that negligible power is abstracted from the drivenline of two coupled transmission lines, the magnitude and mode contentof the forward and backward waves in the side line may be written. Withreference to Fig. 2, there is assumed coupling between two uniform Huesin the interval — L/2 to +L/2 along the axis of propagation, and nocoupling
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