FDTD simulation of millimeter-wave corrugated waveguides with cylindrical symmetry model

Tamura, Yuichi; Nakamura, Hiroaki; Okamura, Takuma; Kashima, N; Fujiwara, Susumu; Kubo, S.

doi:10.1088/1742-6596/410/1/012029

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…where f, L and C are resonant frequency, inductance and capacitance of the launcher, respectively, and they are determined by the impedance parameters in figure 5. Moreover, considering the periodic structure on a mental plate surface, the energy in the input and output ports are affected by the t, g, and d simultaneously [26,30,31]. However, it is difficult to analyze this antenna with rigorous mathematical formula, and the FDTD methods or simulations are often used in literatures [28].…”

Section: The S Parametersmentioning

confidence: 99%

Development of an arch antenna for LHCD in a spherical tokamak

Wang

Zhou²,

Wang³

et al. 2023

Nucl. Fusion

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A lower-hybrid (LH) frequency surface wave antenna called arch is designed and fabricated in this paper for spherical tokamak (ST) named EXL-50. It is used to drive plasma current and heat plasma at 2.45 GHz. The arch antenna consists of twenty-seven antenna elements. The left and right rectangular waveguides integrated with the antenna are used for microwave input and output, respectively. The refraction parallel index of this proposed antenna is 4.3, which is favorable for the lower hybrid current drive (LHCD). The measurement results in absence of plasma show that the reflection and transmission coefficients (S11 and S21) are -12.5dB and -12.6 dB, respectively. The antenna was installed and tested on EXL-50. Up to a 35 kA plasma current was achieved using the arch antenna with a microwave of 70 kW.

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Section: The S Parametersmentioning

confidence: 99%

Development of an arch antenna for LHCD in a spherical tokamak

Wang

Zhou²,

Wang³

et al. 2023

Nucl. Fusion

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“…(We report on the CC-waveguide in another paper. 24) ) The miter bend is the component that changes the direction of electromagnetic waves, as shown in Fig. 7.…”

Section: Introductionmentioning

confidence: 99%

Finite-Difference Time-Domain Simulation on Transmission of Millimeter Waves through Miter Bends

Kashima¹,

Nakamura²,

Takayama³

et al. 2013

Jpn. J. Appl. Phys.

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We have simulated the distribution of electromagnetic (EM) waves through a system composed of miter bends by finite-difference time-domain (FDTD) simulation. To study the effect of mode conversion by miter bends, three shapes of miter bends have been simulated. For the miter bend that has processed grooves inside, the profile of the output EM waves is changed slightly from that of the input wave (HE11 mode). As a result, this case exhibits the best shape of the miter bend in our simulation. In the miter bend without processed grooves inside, the output EM waves change more than in the case of the miter bend with grooves, because mode conversion occurs at the surface in miter bends without grooves. In the simple bend, which changes the direction of EM waves gradually, the profile of the output EM waves is deformed and the input profile is not conserved. Comparing the above three cases, we found that the grooves lead to more efficient to conservation of the profile of EM waves.

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FDTD simulation of millimeter-wave corrugated waveguides with cylindrical symmetry model

Cited by 2 publications

References 2 publications

Development of an arch antenna for LHCD in a spherical tokamak

Development of an arch antenna for LHCD in a spherical tokamak

Finite-Difference Time-Domain Simulation on Transmission of Millimeter Waves through Miter Bends

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