Theory of Nonuniform Waveguides: the cross-section method

Katsenelenbaum, B. Z.; Rio, L. Mercader del; Pereyaslavets, M.; Ayza, Mario Sorolla; Thumm, M.

doi:10.1049/pbew044e

Cited by 141 publications

(112 citation statements)

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“…Due to this the field of an arbitrary TE mode in a coaxial gyrotron cavity can be expressed in terms of the normalized magnetic membrane function ψ( r ⊥ ), which is a slow function of z [20,21]:…”

Section: Formulation Of the Problem And Mathe-matical Approach To Itsmentioning

confidence: 99%

Electromagnetic Analysis of Coaxial Gyrotron Cavity With the Inner Conductor Having Corrugations of an Arbitrary Shape

Zaginaylov¹,

Mitina²

2011

PIER B

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Abstract-The mathematical approach for the calculation of the membrane functions of a coaxial gyrotron cavity with an arbitrary corrugated inner rod is proposed. It is utilized mainly for two aims. First, it is shown that for typical parameters of the coaxial gyrotron cavity with the corrugated inner conductor the shape of corrugations only slightly influences the eigenvalues of competing eigen-modes. However, it can significantly influence the density of ohmic losses in the inner conductor. In particular, it is shown that the density of ohmic losses can be reduced almost twice by the proper choice of the corrugation shape. Second, it is shown that the usual idealizations of the corrugated surface of the inner conductor (the surface with rectangular grooves, having rounded edges, is approximated by a surface with wedged groves that have sharp edges) are correct. The physical interpretation of the obtained results and their practical meaning are discussed.

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Section: Formulation Of the Problem And Mathe-matical Approach To Itsmentioning

confidence: 99%

Electromagnetic Analysis of Coaxial Gyrotron Cavity With the Inner Conductor Having Corrugations of an Arbitrary Shape

Zaginaylov¹,

Mitina²

2011

PIER B

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“…Using this technique the output mode will be 85% TE 11 mode and 15% TM 11 mode that describes a Gaussian output. 13 It has already been shown 14,15 that the TE 11 mode can be converted from the TE 01 /TM 01 mode (which are the power combiner output) using a spiral sinusoidally corrugated cylindrical channel of length L in which the number of spirals m is equal to…”

Section: Power Combiner With the Output Te 11 -Modementioning

confidence: 99%

Efficient power combiner for THz radiation

et al. 2016

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Most dangerous explosive materials, both toxic and radioactive, contain nitrogen salts with resonant absorption lines in the frequency range 0.3-10 THz. Therefore, there has been growing interest in remotely detecting such materials by observing the spectrum of reflected signals when the suspicious material is interrogated by THz radiation. Practical portable THz sources available today generate only 20–40 mW output power. This power level is too low to interrogate suspicious material from a safe distance, especially if the material is concealed. Hence, there is a need for sources that can provide greater power in the THz spectrum. Generating and extracting high output power from THz sources is complicated and inefficient. The efficiency of vacuum electronic microwave sources is very low when scaled to the THz range and THz sources based on scaling down semiconductor laser sources have low efficiency as well, resulting in the well known “THz gap.” The reason for such low efficiencies for both source types is material losses in the THz band. In this article an efficient power combiner is described that is based on scaling to higher frequencies a microwave combiner that increases the output power in the THz range of interest in simulation studies. The proposed power combiner not only combines the THz power output from several sources, but can also form a Gaussian wavebeam output. A minimum conversion efficiency of 89% with cophased inputs in a lossy copper power combiner and maximum efficiency of 100% in a Perfect Electric Conductor (PEC)-made power combiner were achieved in simulations. Also, it is shown that the TE01 output mode is a reasonable option for THz applications due to the fact that conductive loss decreases for this mode as frequency increases.

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“…The second terms in (18) and (19) are the functions of angular coordinates of the observation point and are determined by the current…”

Section: Rp Of Electromagnetic Fieldmentioning

confidence: 99%

Synthesis of Antenna Systems According to the Desired Amplitude Radiation Characteristics

Andriychuk¹

2012

Numerical Simulation - From Theory to Industry

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Theory of Nonuniform Waveguides: the cross-section method

Cited by 141 publications

References 0 publications

Electromagnetic Analysis of Coaxial Gyrotron Cavity With the Inner Conductor Having Corrugations of an Arbitrary Shape

Electromagnetic Analysis of Coaxial Gyrotron Cavity With the Inner Conductor Having Corrugations of an Arbitrary Shape

Efficient power combiner for THz radiation

Synthesis of Antenna Systems According to the Desired Amplitude Radiation Characteristics

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