Field Theory of Planar Helix Traveling-Wave Tube

Chadha, D.; Aditya, Sheel; Arora, Rishabh

doi:10.1109/tmtt.1983.1131432

Cited by 17 publications

(5 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Field analysis of planar tape TWTs with unidirectional conducting (UC) sheets suspended in vacuum [11,12] and planar UC sheets enclosed infinitely with dielectric tubes [13] have been reported by earlier researchers. Kumar and Aditya [14] proposed a simplified tape-helix analysis for unloaded SWS with straight edge connections, in which the effective dielectric constant (EDC) method exhibited accurate dispersion beyond the cut-off frequency.…”

Section: Introductionmentioning

confidence: 94%

“…Thus, all field constants A * n , B * n , C * n , D * n , E * n , and F * n are obtained from the boundary conditions listed in (11) to (12b). However, it is obligatory to satisfy all the magnetic boundary conditions in (12), despite determining all the field constants. It can be observed from ( 18) and ( 19) that the field constant A n is complex, and therefore, C * n and E * n are also complex, whereas B * n , D * n , and F * n are non-complex field constants.…”

Section: Surface Current Density Expansions and Dispersion Equationmentioning

confidence: 99%

See 1 more Smart Citation

Dispersion Analysis of a Planar Rectangular Tape Helix Slow Wave Structures Supported by Dielectric Rods

Babu,

Chauhan

2023

PIER M

View full text Add to dashboard Cite

The dispersion equation for a rectangular tape helix with four rectangular dielectric support rods was derived using precise boundary conditions and field-restricting functions. The dispersion equation is a simplified conjoint expression obtained for the axial and transverse directions, derived by solving an infinite set of linear homogeneous simultaneous equations, represented as an infinite-order matrix whose determinant is zero. The dispersion characteristics plotted from the simplified dispersion equation consist of dominant and additional higher-order modes, similar to an open rectangular slow-wave structure (SWS), but with the existence of β0a(k0a) roots everywhere without the limitations of the forbidden region boundary. The phase velocity curves obtained for the corresponding mode of the dispersion characteristics exhibit comparable behavior to the free-space rectangular helix SWS, especially in the third "allowed" region, which offers a wider beam-wave interaction region with phase speed equivalent to the speed of light at higher operating frequencies. The numerically computed dispersion curves and their corresponding phase velocities were plotted. Similar dimensional variations of the structure with discrete support rods were simulated using three-dimensional simulation software. The dispersion characteristics obtained from the simplified dispersion equation along with the dimensional variation of the dielectric-loaded rectangular tape helix SWS determine the capability and limitations of such minuscule traveling wave tubes (TWTs) as planar TWTs suitable for fabrication using micro-machining techniques.

show abstract

Section: Introductionmentioning

confidence: 94%

Section: Surface Current Density Expansions and Dispersion Equationmentioning

confidence: 99%

Dispersion Analysis of a Planar Rectangular Tape Helix Slow Wave Structures Supported by Dielectric Rods

Babu,

Chauhan

2023

PIER M

View full text Add to dashboard Cite

show abstract

“…[2−7] The unified dispersion equation and interaction impedance for different possibilities of fabricating the planar helix on dielectric substrates are obtained in Ref. [6]. Also a planar helix TWT based on this structure is proposed and the model solution is obtained in Ref.…”

Section: Introductionmentioning

confidence: 99%

Small-signal analysis of a rectangular helix structure traveling-wave-tube

Wei

Duan

et al. 2009

Chinese Phys. B

View full text Add to dashboard Cite

This paper investigates the properties of traveling wave-beam interaction in a rectangular helix traveling-wave-tube (TWT) for a solid sheet electron beam. The 'hot' dispersion equation is obtained by means of the self-consistent field theory. The small signal analysis, which includes the effects of the beam parameters and slow-wave structure (SWS) parameters, is carried out by theoretical computation. The numerical results show that the bandwidth and the smallsignal gain of the rectangular helix TWT increase as the beam current increases; and the beam voltage not obviously influences the small signal gain. Among different rectangular helix structures, the small-signal gain increases as the width of the rectangular helix SWS increases, however, the bandwidth decreases whether structure parameters a and L or ψ and L are fixed or not. In addition, a comparison of the small-signal gain of this structure with a conventional round helix is made. The presented analysis will be useful for the design of the TWT with a rectangular helix circuit.

show abstract

“…A related structure in planar configuration was studied in Refs. [2][3][4][5][6][7]. An investigation of the rectangular helix SWS printed on dielectric substrates and incorporating the shields, considering the width, as far as we know, has not appeared in the literature.…”

mentioning

confidence: 99%

Radio-Frequency Characteristics of a Printed Rectangular Helix Slow-Wave Structure

Wei

Wang

et al. 2008

Chinese Phys. Lett.

View full text Add to dashboard Cite

A new type of printed rectangular helix slow-wave structure (SWS) is investigated using the field-matching method and the electromagnetic integral equations at the boundaries. The radio-frequency characteristics including the dispersion equation and the coupling impedance for transverse antisymmetric (odd) modes of this structure are analysed. The numerical results agree well with the results obtained by the EM simulation software HFSS. It is shown that the dispersion of the rectangular helix circuit is weakened, the phase velocity is reduced after filling the dielectric materials in the rectangular helix SWS. As a planar slow-wave structure, this structure has potential applications in compact TWTs.

show abstract

Field Theory of Planar Helix Traveling-Wave Tube

Cited by 17 publications

References 5 publications

Dispersion Analysis of a Planar Rectangular Tape Helix Slow Wave Structures Supported by Dielectric Rods

Dispersion Analysis of a Planar Rectangular Tape Helix Slow Wave Structures Supported by Dielectric Rods

Small-signal analysis of a rectangular helix structure traveling-wave-tube

Radio-Frequency Characteristics of a Printed Rectangular Helix Slow-Wave Structure

Contact Info

Product

Resources

About