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Coupled helices for use in traveling–wave tubes
1955 Edition, Volume 2, July 1, 1955 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Previous theoretical treatments concerning coupled helices in the absence of a beam, while useful for predicting approximate behavior, are not satisfactory for many tube applications because the presence of a beam can substantially modify the behavior. This...

Coupled helices
1956 Edition, Volume 35, January 1, 1956 - AT&T Corp.

An analysis of coupled helices is presented, using the transmission line approach and also the field approach, with the objective of providing the tube designer and the microwave circuit engineer with a basis for approximate calculations. Devices based on the...

Traveling-wave tubes
1950 Edition, Volume 29, April 1, 1950 - AT&T Corp.

A SIDE FROM HELICES, the circuits most commonly used in traveling-wave tubes are iterated or filter-type circuits, composed of linear arrays of coupled resonant slots or cavities.

Helix Parameters Used in Traveling-Wave-Tube Theory
1950 Edition, Volume 38, April 1, 1950 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Helix parameters used in the normal mode solution of the traveling-wave tube are evaluated by comparison with the field equations for a thin electron beam. Corresponding parameters for a thick electron beam are found by finding a thin beam with...

Failure analysis of ceramic feedthroughs used in traveling-wave tubes
1987 Edition, Volume 34, August 1, 1987 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The effective operation of a high-voltage vacuum device, such as a traveling-wave tube (TWT), is dependent on its ability to maintain a high vacuum environment. However, after the brazing process, cracks in thick-wall ceramic shells will cause feedthrough leakage and...

Traveling-wave tube limiters
1957 Edition, Volume 4, April 1, 1957 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Good broad-band microwave limiters can be built by appropriately modifying conventional traveling-wave tubes. For example, with a single one-watt tube modified suitably the output power could be held constant to within ±½ db over a range of input power of...

Noise in traveling–wave tubes
1955 Edition, Volume 2, April 1, 1955 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

A number of experimental traveling-wave tubes have been built for operation in the 3.2 centimeter wavelength region, and series of noise measurements have been made on these tubes. The periodic dependence of noise figure on the separation between the...

Higher Order Modes in Coupled Helices (Correspondence)
1960 Edition, Volume 8, January 1, 1960 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The problem of electromagnetic wave propagation in a system consisting of the two infinitely long concentric sheath helices free space, shown in Fig. 1, may be approached as a boundary value problem. This has been done before for the case of the lowest mode, but...

Traveling-wave tubes
1950 Edition, Volume 29, October 1, 1950 - AT&T Corp.

A Theoretical Evaluation of the power output of a traveling-wave tube requires a theory of the non-linear behavior of the tube. In this book we have dealt with a linearized theory only. No attempt will be made to develop a non-linear theory. Some results of...

Elliptic cavity couplers for traveling-wave tubes
1963 Edition, Volume 10, March 1, 1963 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

The elliptic cavity coupler is described as a broad band low-loss coupler for microwave slow-wave structures. This type of coupler is particularly useful in helix-type traveling-wave tubes, but can be adapted for other...

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