Documents positively tapered traveling wave tube

documents positively tapered traveling wave tube

A new and unexpected concept of TWT circuit modification which results in high basic beam and depressed collector efficiencies is described. The test resul.
A traveling wave tube (TWT) has a slow wave structure (SWS) which is severed into Positive phase-velocity tapering of broadband helix traveling - wave tubes for This document is to serve as a guide to the investigator who wishes to.
A traveling wave tube as in claim 5, in which the velocity taper section is constructed a driver stage which produces positive signal gain over a predetermined....

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FIELD OF THE INVENTION This invention relates to helical traveling wave tubes, useful in amplifying RF signals in communications, data transmission, broadcasting, satellite and radar mapping applications. In one embodiment of the invention, as depicted in FIG. In one embodiment of the invention, a helical path of varying radius is used in conjunction with a helical structure of.. A slow wave structure embodying the present invention is illustrated in FIG. Manufacturers of tubes have resorted to ceramics and other materials that conduct heat but do not conduct electricity, to transfer heat from the helix itself to an outside housing and from there to outside the traveling wave tube system. Eventually, the electron bunches are no longer favorably phased to give up energy to the traveling wave, and the amplification process ceases. Materials that may be used include, but are not limited to, aluminum oxide, beryllium oxide, boron nitride, diamond, and silicon nitride.
documents positively tapered traveling wave tube


Materials that may be used include, but are not limited to, aluminum oxide, beryllium oxide, boron nitride, diamond, and silicon nitride. The second term suggests a structure whose pitch and radius vary simultaneously. This typically translates into a need for greater heat transfer. However, a circular wire also has the least-sharp corners. In another article travel picks october usbrew of the invention, changing the cross-sectional shape of the wire used to wind the helix, as shown in Fig. A satisfactory adverse space harmonics taper ASHT can be obtained with as few as three to five turns in the input section of the helical traveling wave tube to be effective. By simultaneously decreasing both the pitch and the radius of the helix according to a linear function, documents positively tapered traveling wave tube, an adverse space harmonics taper ASHT is formed. With a helix, the RF signal travels along the helix, roughly approximating a circular path, while the electron beam need travel only one pitch of the helix, a much shorter path. It can be shown that in any periodic helix, a solution of Maxwell's equations will contain an infinity of partial waves of identical frequency, i. It is not necessary that the ellipse be as pronounced as shown in Fig. The helical type has been favored because of its simpler construction, lower cost and large band width. Various modifications are contemplated and can be made without departing from the spirit and scope of the invention as defined by the appended claims. Further analysis of the fundamentals of the RF circuit and the amplification of RF signals reveals that geometric effects in the helical traveling wave tube may be used for suppression of undesired harmonics of the fundamental, not merely for destructive interference.



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  • TAPERED TRAVELING WAVE TUBE FIELD OF THE INVENTION This invention relates to helical traveling wave tubes, useful in amplifying RF signals in communications, data transmission, broadcasting, satellite and radar mapping applications.
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A gain flattening section... This machining achieves the required variation in the effective radius of the helix, as measured to the center of the remaining wire.

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The slow phase velocity section may be disposed at the beginning of the output section for gain flatness. Field of the Invention.

documents positively tapered traveling wave tube

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