Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Patent
1985-03-20
1986-01-14
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Combined cathode ray tube and circuit element structure
315 35, 315 393, 330 43, H01J 2534
Patent
active
045647879
ABSTRACT:
The object of the invention is to provide a traveling wave tube with increased linearity to avoid intermodulation of signals being amplified. In a traveling wave tube 10, as shown in FIG. 1, the slow wave structure is a helix (18) including a sever (21). A dynamic velocity taper is provided by gradually reducing the spacing (26) between the repeating elements of the slow wave structure which are the windings of helix (18). The reduction takes place between Zo indicated by line 23 and Z.sub.s which coincides with the output point of helix (18) as indicated by the line (22). The spacing (26) begins to decrease at Z.sub.o and is decreased by up to about 5% at Z.sub.s. The spacing (26) between the repeating elements of the slow wave structure is ideally at an exponential rate because the curve (27), as shown in FIG. 3, increases from Z.sub.o to Zs the point of maximum efficiency and power, at an exponential rate. FIG. 3 shows a coupled cavity traveling wave tube having cavities 32 through 37. The axial length of cavities (35) through (37) is gradually reduced between Z.sub.o to Z.sub.s. To this end, the spacing between apertured discs 38 is gradually reduced between Z.sub.o and Z.sub.s from 0.1% to 5% at an exponential rate. In FIG. 4, curve 28 represents output power (or efficiency) versus input power for a commercial tube. Curve 31 represents the same parameters for a tube embodying the invention and shows the great linearity achieved by the dynamic velocity taper.
REFERENCES:
patent: 3614517 (1971-10-01), Dionne
patent: 3678326 (1982-07-01), Heynisch
patent: 3761760 (1973-09-01), Harper et al.
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patent: 3846664 (1974-11-01), King et al.
patent: 4107572 (1978-08-01), Yuasa et al.
patent: 4315194 (1982-02-01), Connolly
patent: 4378512 (1983-03-01), Tsutaki
Chatmon Saxfield
Mackin James A.
Manning John R.
The United States of America as respresented by the Administrato
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