• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.457-460
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• 1988

We present here a numerical solution for obtaining propagation characteristics including lossess for various modes of an multi-layered optical waveguide structure. The method is based on transmission line analogy. A comparison with other method shows the our results are accurate and simple.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.32A no.7
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• pp.30-35
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• 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.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.30A no.12
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• pp.36-42
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• 1993

By the variational method, the coplanar waveguide(C.P.W) shielded by two conducting plates has been analyzed. The particular potential solution has been obtained for the boundary conditions in C.P.W. The characteristic impedance and the effective dielectric constant in C.P.W. have been obtained by the variational method using the potential function and the assumed basis function for charge distributions. To consider the effect of the conducting plate in C.P.W. two cases, with and without the top plate, have been analyzed and compared respectively.

• Proceedings of the Optical Society of Korea Conference
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• 2006.07a
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• pp.493-494
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• 2006

Fabrication-error tolerant directional couplers are designed and analyzed. In the wavelength region of $1.55{\mu}m$, the coupling characteristics of the 3dB coupler is 50${\pm}$4%, when the waveguide width error is ${\pm}0.2{\mu}m$.

• Proceedings of the KIEE Conference
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• 1987.07a
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• pp.119-122
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• 1987

By cascading the step discontinuities on planar dielectric waveguides with a ferrite layer through two uniform planar dielectric waveguides, nonreciprocal scaterring characteristics of planar dielectric waveguide gratings are analyzed. The calculated results at 35GHz shows that the isolation mechanism takes place near band stop frequency range.

• Journal of the Semiconductor & Display Technology
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• v.9 no.2
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• pp.97-102
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• 2010

Propagation modes of symmetric metal-insulator-metal SPP waveguides are analyzed. Main characteristics of these waveguides such as mode effective index, propagation length, and penetration depths are calculated at the telecom wavelength for different layer thickness. We adopt Au, Al as a metal material and air, glass as a dielectric material and obtain different optical characteristics. The surface plasmon characteristics in this paper provide a numerical insight for designing nanostructure metal plasmon waveguide.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2000.11a
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• pp.416-419
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• 2000

A narrow slot in the broad wall of a rectangular waveguide is analysed using a Spatial Network Method[1] which takes account of the waveguide wall thickness. In essence, SNM is used to solve arbitrary shape and materials constant, derived from maxwell's equations to find the tangential electric fields on the upper and lower surfaces of the slot. In this paper, applying to the offset and length[2] which yield a zero equivalent shunt susceptance, analysing single and 4 array slot antenna. The current of the transient analysis shows each the times. Analysed result of SNM is verified by the method of moment and HFSS.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.7
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• pp.1770-1776
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• 1998

This paper presents a waveguide-to-mircostrip transition at Ka-band using antipodal finlines. Critical design parameters were identified with the help of theoretical analysis. Experimental optimization was performed together with 3-D FEM analysis in an effort to find optimum dimensions of the transition. In addition to the conventional antipodal finline transition, a new dielectric impedance transformer was introduced to further reduce the insertion loss. Optimized waveguide-to-microstrip transition showed an insertion loss of 0.3~0.4dB/transition at Ka-band. This transition provides superior reproducibility and better performance than conventional coaxcable-to-microstrip transition.

• Proceedings of the KIEE Conference
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• 2000.11c
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• pp.591-593
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• 2000

A narrow slot in the broad wall of a rectangular waveguide is analysed using a Spatial Network Method[1] which takes account of the waveguide wall thickness. In essence, SNM is used to solve arbitrary shape and materials constant, derived from maxwell's equations to find the tangential electric fields on the upper and lower surfaces of the slot. In this paper, applying to the offset and length[2] which yield a zero equivalent shunt susceptance, analysing single and 4 array slot antenna. The current of the transient analysis shows each the times. Analysed result of SNM is verified by the method of moment and HFSS.

• Journal of Energy Engineering
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• v.25 no.1
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• pp.86-91
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• 2016

Convenient design guideline for Waveguide-below-cutoff (WBC) array is proposed to obtain the minimum waveguide length for electromagnetic pulse (EMP) shielding. The analysis includes circular, rectangular, and hexagonal WBC, determine the total length of the waveguide. When the unit side of rectangular WBC and the diagonal line of hexagonal WBC are given as 30 mm, the length of hexagonal WBC is 5 mm shorter than rectangular case with shielding effectiveness (SE) 80 dB. The length difference is deepened with SE of 100 dB, which shows approximately 30 mm shorter length for hexagonal case than others. In addition, hexagonal WBC requires much shorter length than circular WBC. In conclusion, hexagonal case is the most effective with respect to flow velocity and pressure loss for equivalent SE.