Analysis of some periodic structures of microwave tubes: part II: analysis of disc-loaded fast-wave circular waveguide structures for gyro-travelling-wave tubes

Kesari, Vishal; Basu, B. N.

doi:10.1080/09205071.2018.1451396

Cited by 3 publications

(15 citation statements)

References 28 publications

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“…In this model (model-3) a circular metallic waveguide of inner radius r W is considered in which annular disc of thickness T, inner radius r D and outer radius r W Interwoven disc-loaded circular waveguides [2,9,14,15]. Circular waveguide loaded with metal vanes [16][17][18].…”

Section: Circular Waveguide With Annular Metal Discsmentioning

confidence: 99%

“…are arranged periodically with periodicity L. The structure is commonly known as the disc-loaded circular waveguide (conventional) ( Figure 4) [2,5,[8][9][10][11][12][13]. As the structure is periodic, therefore one period of the structure coupled with Floquet's theorem is sufficient for the analysis of the infinitely long structure [1,2,5,8,9]. For the sake of analysis, the structure may be divided into two analytical regions, the central free-space (disc free) region I: 0 ≤ r , r D , 0 ≤ z , ∞; and the disc occupied region II: Figure 4).…”

Section: Circular Waveguide With Annular Metal Discsmentioning

confidence: 99%

“…The disc free and disc occupied regions are assumed to support propagating (traveling) and stationary waves, respectively. The relevant (axial magnetic and azimuthal electric) field intensity components in the region I is given by (1) and (2) and in the region II may be written as [2,5,[9][10][11][12][13]:…”

Section: Circular Waveguide With Annular Metal Discsmentioning

confidence: 99%

“…This model (model-4) differs from the conventional disc-loaded circular waveguide due to different additional disc included in between two identical consecutive discs of conventional disc-loaded circular waveguide [2,9,14,15]. Thus, this model is considered with a circular metallic waveguide of inner radius r W in which annular disc of thickness T, inner radius r D and outer radius r W are arranged periodically with periodicity L. In addition, another annular disc of thickness T BH , inner radius r BH and outer radius r W are also arranged periodically with periodicity L such that the disc of thickness T BH is placed in middle of two identical consecutive discs of thickness T. The structure is known as the interwoven-discloaded circular waveguide.…”

Section: Interwoven-disc-loaded Circular Waveguidementioning

confidence: 99%

“…The boundary conditions (24) and (25) state the continuity of the axial component of magnetic and the azimuthal component of electric field intensities at the interface, r ¼ r D , between the regions I and II, and the null azimuthal component of electric field intensity at the disc hole metallic surface ( Figure 4) [2,5,[9][10][11][12][13].…”

Section: Boundary Conditionsmentioning

confidence: 99%

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Metal- and Dielectric-Loaded Waveguide: An Artificial Material for Tailoring the Waveguide Propagation Characteristics

Kesari¹

2020

Electromagnetic Materials and Devices

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In the present chapter a number of loaded structures are studied with circular cross-section to explore the deviation in their dispersion characteristics from their parent circular waveguide. The dielectric and/or metal loading to the waveguide tailors its dispersion characteristics. In general, the dielectric depresses and the metal elevates the dispersion characteristics from the characteristics of their parent circular waveguide. The axial periodicity results in periodic dispersion characteristics with a lower and an upper cutoff frequency (bandpass). However such a characteristic is not reported for the azimuthal periodic structures. The bandpass characteristic arises due to the shaping of the dispersion characteristics. Therefore the dispersion shaping is only possible with axial periodicity and not with the azimuthal periodicity. The sensitivity of the structure (geometry) parameters on the lower and upper cutoff frequencies, the extent of passband and the dispersion shaping are also included. In the axial periodic structures, the periodicity is found to be the most sensitive parameter for tailoring the dispersion characteristics and the disc-hole radius is the most sensitive parameter for shifting the dispersion characteristics over the frequency axis.

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Section: Circular Waveguide With Annular Metal Discsmentioning

confidence: 99%

Section: Circular Waveguide With Annular Metal Discsmentioning

confidence: 99%

Section: Circular Waveguide With Annular Metal Discsmentioning

confidence: 99%

Section: Interwoven-disc-loaded Circular Waveguidementioning

confidence: 99%

Section: Boundary Conditionsmentioning

confidence: 99%

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Metal- and Dielectric-Loaded Waveguide: An Artificial Material for Tailoring the Waveguide Propagation Characteristics

Kesari¹

2020

Electromagnetic Materials and Devices

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Review of the high-power vacuum tube microwave sources based on Cherenkov radiation

Xu¹,

Xu²,

Liu³

2020

Preprint

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Since the first vacuum tube (X-ray tube) was invented by Wilhelm Röntgen in Germany, after more than one hundred years of development, the average power density of the vacuum tube microwave source has reached the order of 108 [MW][GHz]2. In the high-power microwave field, the vacuum devices are still the mainstream microwave sources for applications such as scientific instruments, communications, radars, magnetic confinement fusion heating, microwave weapons, etc. The principles of microwave generation by vacuum tube microwave sources include Cherenkov or Smith-Purcell radiation, transition radiation, and Bremsstrahlung. In this paper, the vacuum tube microwave sources based on Cherenkov radiation were reviewed. Among them, the multi-wave Cherenkov generators can produce 15 GW output power in X-band. Cherenkov radiation vacuum tubes that can achieve continuous-wave operation include Traveling Wave Tubes and Magnetrons, with output power up to 1MW. Cherenkov radiation vacuum tubes that can generate frequencies of the order of 100 GHz and above include Traveling Wave Tubes, Backward Wave Oscillators, Magnetrons, Surface Wave Oscillators, Orotrons, etc.

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Quantitative Analysis of Photon Density of States for One-Dimensional Photonic Crystals in a Rectangular Waveguide

Jao¹,

Lin

2019

Crystals

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Light propagation in one-dimensional (1D) photonic crystals (PCs) enclosed in a rectangular waveguide is investigated in order to achieve a complete photonic band gap (PBG) while avoiding the difficulty in fabricating 3D PCs. This work complements our two previous articles (Phys. Rev. E) that quantitatively analyzed omnidirectional light propagation in 1D and 2D PCs, respectively, both showing that a complete PBG cannot exist if an evanescent wave propagation is involved. Here, we present a quantitative analysis of the transmission functions, the band structures, and the photon density of states (PDOS) for both the transverse electric (TE) and transverse magnetic (TM) polarization modes of the periodic multilayer heterostructure confined in a rectangular waveguide. The PDOS of the quasi-1D photonic crystal for both the TE and TM modes are obtained, respectively. It is demonstrated that a “complete PBG” can be obtained for some frequency ranges and categorized into three types: (1) below the cutoff frequency of the fundamental TE mode, (2) within the PBG of the fundamental TE mode but below the cutoff frequency of the next higher order mode, and (3) within an overlap of the PBGs of either TE modes, TM modes, or both. These results are of general importance and relevance to the dipole radiation or spontaneous emission by an atom in quasi-1D periodic structures and may have applications in future photonic quantum technologies.

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Analysis of some periodic structures of microwave tubes: part II: analysis of disc-loaded fast-wave circular waveguide structures for gyro-travelling-wave tubes

Cited by 3 publications

References 28 publications

Metal- and Dielectric-Loaded Waveguide: An Artificial Material for Tailoring the Waveguide Propagation Characteristics

Metal- and Dielectric-Loaded Waveguide: An Artificial Material for Tailoring the Waveguide Propagation Characteristics

Review of the high-power vacuum tube microwave sources based on Cherenkov radiation

Quantitative Analysis of Photon Density of States for One-Dimensional Photonic Crystals in a Rectangular Waveguide

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