• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2012.10a
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• pp.237-238
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• 2012

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2012.04a
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• pp.505-506
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• 2012

• The Journal of Korean Institute of Communications and Information Sciences
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• v.10 no.2
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• pp.76-81
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• 1985

This paper presents basis functions for curvilinear square elements and describes finite element analysis for coaxial cable and coaxial cross-section waveguide. On the case of coaxial cable, the more exact results is obtained by the propotional elements than by the equal elements with the same number of elements. It is found that the cutoff frequency of coaxial cross-sectional waveguide is more dependent on the inner and outer radius than the cross-sectional angle.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.9 no.5
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• pp.621-629
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• 1998

Propagation characteristics of electromagnetic waves in lossy tunnels are analysed using Finite Element Method with edge basis function. According to the analysis lossy dielectric wall on the tunnel highly affects the characteristics of the waves in the tunnel. Also higer modes are separated using mode orthogonality principle, and the propagation characteristics of higer modes are investigated. To verity the numerical results, miniatures of the tunnels are constructed and measurements of the waves are accomplished.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.6
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• pp.1244-1250
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• 1997

An arbitrary shaped iris in rectangular waveguideis investigated using FEM-CDMA with triangularprism elements in this paper. The volume of irisis subdivided into a relatively small number of triangular prism elements and FEM is used to formulate the field distribution. On the other hand, the fields in the waveguide region are represented by BIM derived from the waveguide Green's function and boundary conditions. The proposed method is verified through the design and experiment for the circular iris filter using WR-90 waveguide.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.37 no.4
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• pp.45-52
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• 2000

We present a novel method for simple and efficient analysis of the rectangular MQW waveguide. Preferentially two-dimensional structure is transformed into one-dimensional structure by using the effective index method. Then, the characteristic matrix of the resultant planar MQW waveguide is analyzed by scanning angle method. The effective index, modal intensity, and optical confinement factor of rectangular MQW waveguide can be effectively obtained by this method. Our simulation results show excellent agreement with the accurate solutions based on the finite element method. We also introduce the approximation methods for the analysis of rectangular MQW waveguide and investigate their validity. By using perturbation approach, modal power loss of guided wave in rectangular MQW waveguide is newly investigated and compared with the conventional method using the approximation of planar MQW waveguide.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.7
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• pp.1764-1769
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• 1998

The FE-BI (finite element- boundary integral) method is used for the characterization of an arbitrary-shaped multiaperture-coupled directional coupler between two retangular waveguides crossing with an arbitrary angle. The method is shown to be much more effective than the ordinary FEM for the structures under consideration. the computation time is compared with that of the ordinary FEM. The results of other papers for Moreno coupler are compared with the theoretical prediction and a good agreement is obtained.

• Proceedings of the KIEE Conference
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• 1997.07e
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• pp.1883-1886
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• 1997

3차원 유한요소법에 정합 조건을 구현하기 위해 유한한 두께를 갖는 흡수체을 이용하였다. 흡수체는 자유공간과의 경계에서 모든 입사각에 대해 무반사특성을 갖으며, 일단 흡수체 내로 전파된 파는 흡수체의 끝에 도달하기 전에 흡수체를 통과하면서 충분히 손실되도록 하였다. 이러한 흡수체는 ${\varepsilon}_r$과 ${\mu}_r$에 비등방복소주대각텐서를 사용하여 구현된다. 구현된 흡수체층은 구형도파관에 적용하여, 전파상수를 이용하여 정합시킨 경우와 결과를 비교하였다.

• Journal of Internet Computing and Services
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• v.23 no.3
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• pp.67-76
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• 2022

Power and signal transmission using electromagnetic waves are essential in modern times, and a guided structure is needed to transmit electromagnetic waves efficiently through the desired path. This paper performed an electromagnetic simulation using the in-house code for the 2-D/3-D waveguide using the finite element method. The accuracy of the analysis was verified by comparing it with the results of HFSS, a representative electromagnetic wave simulation software. In addition, the performance of the Absorbing Boundary Condition (ABC), which is essential to truncate the infinite computational domain for computational electromagnetics, was analyzed. Finally, the parallelization technique was applied to accelerate the simulation speed, demonstrating performance improvement.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1988.10a
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• pp.131-134
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• 1988

A finite-element method in order to invesligate the propagation characteristics of waveguide is used and most of varjational expressione of the propagation constant are a funetional of frequency. Consequently, if the permeability or permitlivity of the medium is a funetion of frequency the calculation becomes almost impossible. In this paper our method can be applied to the case where the permittivity or permeability of the media is a function of frequency and is useful for the analysis of any arbitrality dielectric wavegudie.