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468,548. Signalling through dielectric guides. STANDARD TELEPHONES & CABLES, Ltd. (Western Electric Co., Inc.) Sept. 25, 1936, No. 26068. [Class 40 (v)] Relates to dielectric " guides " for carrying ultrahigh-frequency currents in various wave-forms, and to means for converting the electric energy from one specified wave - form to another. The " guide " consists of any dielectric, such as air, bounded by a metallic tube which acts as a dielectric " discontinuity " to localize the energy. Different types of waves may be propagated through such a guide. They are distinguished according to whether the electric field lies parallel to the axis, as shown in Fig. 1, in which case they are called " electric " ; or whether the magnetic field is so disposed, as shown in Fig. 3, in which case they are called magnetic waves. There are symmetric and asymmetric waves of both types, as well as waves of the second order. Fig. 9 shows a construction of guide in which internal metallic baffles or pipes 110, 113, 114 (having the progressive cross-sections shown in Fig. 10) are used to convert an asymmetric magnetic wave, generated at the left-hand end of the tube, into a symmetric magnetic wave, by twisting the lines of force appropriately, Figs. 26 and 27 similarly show the construction of a guide for converting a symmetric electric wave to an assymmetric magnetic one ; whilst Figs. 35 and 36 may be used for changing . a symmetric electric into a symmetric magnetic wave. Various other forms of wave-converter are described, in all of which internal baffles engage the travelling lines of force, and gradually deflect and reconnect them in the desired new disposition.
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