Wide-band high-power delay line

Claim 2

In an electron tube delay line for a microwave electronic tube, the improvement comprising A. a single main helix wound cylindrically with an even pitch and adapted to be traversed internally and axially by an electron beam and B. at least one secondary conductor helix wound cylindrically with an even pitch in the same direction as said single main helix and extending externally thereof and parallel thereto; said single main helix and said secondary helix being in electric contact with one another at several locations along a common generatrix; the ratio of the diameter of the single main helix to the diameter of the secondary helix and the ratio of the pitch of the single main helix to the pitch of the secondary helix being identical integers greater than 1.

Claim 3

An improvement as defined in claim 1, including two identical secondary helices extending externally of and parallel to said single main helix along diametrically opposed sides thereof, said secondary helices contacting said single main helix at several locations along diametrically opposed generatrices common to said single main helix and to one and the other secondary helix.

Claim 4

An improvement as defined in claim 1, wherein the said secondary helix extends over a length shorter than the single main helix.

Claim 5

An improvement as defined in claim 2, wherein the said two secondary helices extend over a length shorter than the single main helix.

Claim 6

An improvement as defined in claim 1, wherein each said ratio is 2.

Claim 7

A microwave electron tube comprising A. a single main helix, B. an electron gun disposed adjacent one end of said single main helix in the loNgitudinal axis thereof to emit an electron beam travelling inside and coaxially with said single main helix, C. a collector of electrons disposed adjacent the other end of said single main helix in the longitudinal axis thereof to receive the electrons forming said electron beam and D. at least one secondary helix extending externally of and parallel to said single main helix; turns of said single main helix being in direct electric contact with turns of said secondary helix at several locations along coinciding generatrices of said single main helix and second secondary helix; the ratio of the diameter of said single main helix to the diameter of said secondary helix and the ratio of the pitch of said single main helix to the pitch of said secondary helix being identical integers greater than 1.

Claim 8

A microwave electron tube comprising A. a single main helix, B. an electron gun disposed adjacent one end of said single main helix in the loNgitudinal axis thereof to emit an electron beam travelling inside and coaxially with said single main helix, C. a collector of electrons disposed adjacent the other end of said single main helix in the longitudinal axis thereof to receive the electrons forming said electron beam and D. at least one secondary helix extending externally of and parallel to said single main helix; turns of said single main helix being in direct electric contact with turns of said secondary helix at several locations along coinciding generatrices of said single main helix and second secondary helix; the ratio of the diameter of said single main helix to the diameter of said secondary helix and the ratio of the pitch of said single main helix to the pitch of said secondary helix being identical integers greater than 1.

Claim 9

A microwave electron tube as defined in claim 6, wherein the number of the secondary helices is at least two; said secondary helices are evenly distributed about said single main helix.