US PATENT SUBCLASS 315 / 39.3
.~.~ Traveling wave type with delay-type transmission line

Current as of: June, 1999
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315 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES: SYSTEMS

32  DF  COMBINED LOAD DEVICE OR LOAD DEVICE TEMPERATURE MODIFYING MEANS AND ELECTRICAL CIRCUIT DEVICE STRUCTURE {19}
39  DF  .~ Discharge device load with distributed parameter-type transmission line (e.g., wave-guide, coaxial cable) {1}
39.3.~.~ Traveling wave type with delay-type transmission line

DEFINITION

Classification: 315/39.3

(under subclass 39) Subject matter in which the transmission line with distributed parameters incorporated in the tube structure is arranged to propagate a traveling electro-magnetic wave and is constructed and arranged to have a wave component the velocity of which is reduced in comparison with the wave velocity in free space; and in conjunction therewith are means for generating an electron stream whose path is in proximity to the path of said traveling wave component so as to permit an exchange of energy between the electron stream and the traveling wave propagated along the transmission path.

(1) Note. The transmission line or waveguide may be constructed as a spiral or helix so that the wave has an axial velocity component along the helix which is lower than the free space velocity of the wave, or the transmission line or waveguide may be loaded as by inductive members to reduce the velocity of the traveling wave. Another type included is a transmission line formed by an electrode having a plurality

of resonant cavities formed in the electrode adjacent to an along the path to be taken by the electron stream, the structure being such that a traveling wave may be propagated along the length of the structure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1+, for miscellaneous discharge device systems using tubes such as are classified in this subclass.

3.5+, for this subject matter where the discharge device includes means to focus or otherwise shape the electron stream into a beam.

39.51+, 40 and 41+, for other discharge devices which have structurally combined therewith an inductor or which have an electrode formed so as to act as if it possessed inductance, with or without a capacitive impedance combined with or inherent in the structure. The devices in these subclasses are distinguished from the devices in subclass 39.3 primarily in that the distributed parameter structure in these subclasses is not a transmission line arranged to propagate a traveling wave. SEE OR SEARCH CLASS

330, Amplifiers,

43, for amplifier systems which include traveling wave tubes. See Lines With Other Classes and Within This Class and References to Other Classes in the Class Definitions of Class 330.

332, Modulators, especially

131+, 147+ and 165+ for modulator systems having tubes of the type here classified.

333, Wave Transmission Lines and Networks,

22, for transmission lines of the distributed parameter type (e.g., waveguides, long lines) having dissipating terminations, subclasses 138+ for delay networks, subclasses 32+ for impedance matching networks for transmission lines, subclass 81 for transmission lines of the long line with an attenuator means, and attenuators especially designed for use over a frequency band or for use in transmission lines of the distributed parameter type, and subclasses 236+ for the structure of transmission lines of the distributed parameter type.