• Title/Summary/Keyword: 평행평판

Search Result 158, Processing Time 0.032 seconds

Equivalent Admittance and Complex Powers in a Coupling through a Narrow Slit in a Parallel-Plate Waveguide (평행평판도파관의 좁은 슬릿을 통한 결합에 있어서 등가어드미턴스 및 복소전력)

  • Lee, Jong-Ig
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.13 no.10
    • /
    • pp.2059-2065
    • /
    • 2009
  • In this study, it has been considered that the TEM wave is incident on the transverse slit in the upper plate of a short-ended parallel-plate waveguide (PPW). An equivalent slit admittance and complex power for the case of narrow slit are obtained. The conditions for the slit voltage and the complex power in case of the maximum coupling through the slit with a nearby scatterer exterior the PPW are checked.

A High Effeciency Functional Water Generation Characteristics by Corona Discharge and Space Charge Control (코로나방전과 공간전하제어에 의한 고효율 기능수 발생특성)

  • 김진규
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.16 no.4
    • /
    • pp.101-107
    • /
    • 2002
  • A novel oxidant generation and ion precipitation cell with slits on parallel plate electrodes was proposed instead of the conventional parallel plate type. An investigation was carried out on the effect of the number and size of slits on ion precipitation and oxidant generation characteristics, evidenced by eliminated space charge limiting action and by elevated electric fields in active interelectrode sparing. Consequently, very high ion precipitation and dense oxidant generation characteristics can be realized by having slits un the electrodes of conventional cells as these slits increase the electric fields and decrease the space charge limiting actions in interelectrode spacing.

Study on the Electromagnetic Wave Propagation In the Parallel-Plate Waveguide with the Metamaterial ENZ Tunnel Embedded (Metamaterial ENZ 터널이 포함된 평행 평판 도파관 내 전자기파의 전파 특성에 관한 연구)

  • Kahng, Sung-Tek
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.20 no.2
    • /
    • pp.135-140
    • /
    • 2009
  • This paper discusses how to change the electromagnetic waves' property in the cut-off causing discontinuity existing in the guiding structure of the RF passive component by using the metamaterial and elaborates on its principle. Particularly, we find and explain, from the viewpoint of electromagnetics and circuit theories, the so-called tunneling condition that when the segment with an extremely narrow cross-section leading to blockage in the parallel-plate waveguide is given the ENZ(Epsilon Near Zero) for its filling material, the wave starts to propagate through the segment. The analysis method as a transmission-line theory taking the discontinuity and material change into consideration is shown valid through the comparison with other methods for analyzing parallel-plate waveguides, and provides the illustration of the S-parameters and impedance describing the characteristics of the tunneling.

Electromagnetic Transmission through Slits in Two Adjacent Conducting Parallel-Plates (근접하는 도체 평행 평판의 슬릿을 통한 전자파 투과)

  • Lee, Jong-Ig;Ko, Ji-Hwan;Cho, Young-Ki
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.20 no.1
    • /
    • pp.83-90
    • /
    • 2009
  • In this paper, the problem of electromagnetic transmission through slits in two parallel conducting plates which separate two half spaces is considered. The coupled integral equations for the electric field distributions over the slits are developed for the case that the TM polarized plane wave is incident on the slit and solved by the method of moments. The transmitted power beyond the slit-perforated conducting parallel plates is computed in order to check the variations of the coupled power through slits against some parameters such as the incident angle of the TM polarized wave, slit width, lateral distance between two slits, and distance between the conducting plates. When the lateral distance between two slits approaches near the multiples of half wavelengths, the transmission resonance (maximum power transmission) is observed. If the slit width in the incident side is narrow and the distance between conducting plates is small compared to the wavelength, the maximum of transmitted power is observed to be nearly independent of the incident angle and slit width. In addition, the mechanism of the transmission resonance in the present geometry is explained using a simplified geometry and its equivalent circuit.

Characteristics mode analysis for the finite slotted parallel-plate waveguide as a leaky wave antenna structure (유전체로 채워진 유한한 슬롯을 가지는 평행평판 도파관 누설파 안테나 구조에 대한 특성 모드 해석)

  • 윤이호;조영기
    • Journal of the Korean Institute of Telematics and Electronics D
    • /
    • v.34D no.10
    • /
    • pp.32-38
    • /
    • 1997
  • A characteristic mode analysis of parallel-plate waveguide with finite number of slot as a leaky wav eantenna structure is considered for calculating the characteristics currents, the characteristic patterns, radiatin patterns, and the complex propagation constants. For the cases of 1, 11 and 29 slots, numericl resutls for the equivalent magnetic currents, the radiatin patterns, and thecomplex propagation constants are computed and compared with those obtained by use of the conventional method of moments. Good correspondence between them is observed.

  • PDF

A Quantitative Visualization of Mixed Convection in Parallel Plates Using PIV (PIV를 이용한 평행평판 내의 혼합대류의 정량적 가시화)

  • 박일용;배대석
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.28 no.3
    • /
    • pp.509-515
    • /
    • 2004
  • The PIV(Particle Image Velocimetry) with liquid crystal tracers is used for visualizing and analysis of the mixed convection in the parallel plates with the upper part cooled and the lower part heated. It is found that the flow pattern of mixed convection in the parallel plates can be classified into three patterns which was affected by Reynolds number. Also, the periodic nature is confirmed, and visualized in experiment.

Modal Analysis and MoM to Examine and Tackle Resonance Problems of Power/Ground Planes (평행평판 공진 해석과 효율적인 저감을 위한 모드 해석법과 모멘트 방법의 연구)

  • Shin, Un-Chol;Jang, Gun-Ho;Kahng, Sung-Tek
    • Proceedings of the KIEE Conference
    • /
    • 2008.07a
    • /
    • pp.1436-1437
    • /
    • 2008
  • In this work, we investigate the electrical and electromagnetic behaviors of the power-bus with a variety of shapes of aperture, on the signal integrity, using a rigorous methods(Modal or MoM) along with Modal analysis method.

  • PDF

Analysis of periodically slotted dielectrically filled parallel-plate waveguide as a leaky wave antenna : E-polarization case (유전체로 채워진 주기적인 슬롯을 갖는 평행평판 도파관 누설파 안테나의 해석 : E-편파)

  • 이창원;조영기
    • Journal of the Korean Institute of Telematics and Electronics A
    • /
    • v.32A no.7
    • /
    • pp.30-35
    • /
    • 1995
  • Periodically slotted dielectrically filled paralled-plate waveguide as a leaky wave antenna is analysed for E-polarization case. The homogeneous linear equation whose unknown is the surface current density over the conducting strip is formulated, from which the complex propagation constant is calculated and compared with the previous results. Good correspondence between them is observed. And a method for the radiation pattern is also considered.

  • PDF

Comparison of Air Kerma­based and Absorbed Dose to Water­based Protocols in the Dosimetry of High Energy Electron Beams (고 에너지 전자선에 대한 공기커마와 물 흡수선량에 기반한 프로토콜간의 비교)

  • 박창현;신동오;박성용
    • Progress in Medical Physics
    • /
    • v.14 no.4
    • /
    • pp.249-258
    • /
    • 2003
  • A few years ago, a proposal was made to change the dosimetry from the air kerma-based reference dosimetry to the absorbed dose-based reference dosimetry for all radiotherapy beams of ionizing radiation to improve the accuracy of dosimetry. Here, we present a dosimetry study in which the two most widespread absorbed dose­based protocols (IAEA TRS­398 and AAPM TG­51) were compared with an air kerma­based protocol (IAEA TRS-277) by measuring the absorbed dose in the same reference depth. Measurements were performed in three clinical electron beam energies using a PTW 30002 cylindrical chamber, and Markus and Roos plane­parallel chambers. $^{60}$ Co calibration factors were obtained from the KFDA. The absorbed dose differences between the air kerma­based and absorbed dose­based protocols were within 2.0% for all chambers in all beams. The results thus show that the obtained absolute dose values will be not significantly altered by changing from the air kerma­based dosimetry to the absorbed dose­based dosimetry. It was also shown that absorbed dose values between the absorbed dose­based protocols agreed by deviations of less than 0.5% for a cylindrical chamber and less than 0.7% for plane­parallel chambers using cross­calibration factors. Although the use of a cylindrical chamber and plane­parallel chambers resulted in a difference of less than 2% for all situations investigated here, to reduce errors, the plane­parallel chambers are recommended for electron energies in which the use of cylindrical chamber is not permitted in each protocol.

  • PDF