• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.11 no.3
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• pp.358-364
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• 2000

In this paper, an efficient moment-method technique is proposed for analyzing rectangular waveguide E-plane filters. Techniques are presented for the fast evaluation of Green's function and for the efficient evaluation of integrals arising in the E-plane of the rectangular waveguide. The structure boundary is represented by the piecewise linear segments. Simple pulse-expansion and point-matching technique are used. The entire E-plane filter structure is simulated by the method of moments. Three representative cases of the E-plane filter are analyzed and compared with results by other researchers.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.04a
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• pp.102-107
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• 2013

It is important to understand the vibrating behavior of plate structures for many engineering applications. In this study, vibration characteristics of strip plates which have finite width and infinite length are investigated theoretically and numerically. The waveguide finite element approach is used in this study which is known as an effect tool for waveguide structures. WFE method requires only cross-sectional FE model and uses theoretical harmonic solutions for the wave propagation along the longitudinal direction. First of all for a simple strip plate, WFE results are compared with theoretical ones such as the dispersion diagrams, point mobilities, etc. to validate the numerical model. Then in the numerical analysis, the several different types of longitudinal stiffeners are included to the plate model to investigate the effects of the stiffeners in terms of the dispersion curves and mobilities.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2006.05a
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• pp.1338-1342
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• 2006

This paper presents the theoretical approach to describe the wave propagation in the waveguide with varying cross-section. The waveguides considered in this paper are stepped-rod, tapered-rod, and stepped rod with a tapered section at the middle of wave-transmission. The wave transmission ratio for displacement, stress, and power was calculated for these three rods. The distribution of the stress and displacement along the stepped rod with a tapered section was calculated and compared with the results obtained by FEM analysis.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.11
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• pp.2049-2054
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• 2006

This paper demonstrates a comparison of linear and nonlinear analyses for thermo-optic effects of optical temperature sensor based on the etched silica-based planar waveguide Bragg grating. Topics include theoretical analyses and experiment of the etched planar waveguide Bragg grating optical temperature sensor, Theoretical models with nonlinear than linear temperature effect for the grating response based on waveguide and plate deformation theories agree with experiments to within acceptable tolerance.

• Journal of the Optical Society of Korea
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• v.12 no.4
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• pp.346-350
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• 2008

In this paper, we analyze the performance of a reliable, scalable, and cost-effective switchless wavelength division multiplexing (WDM) network based on an arrayed waveguide grating (AWG). The network efficiency is significantly increased by spatially reusing wavelengths and exploiting multiple free spectral ranges (FSRs) of the AWG employed in the architecture. We have analyzed the performance of this architecture by simulating in $Optsim^{TM}$ with a control channel which exploits the broadband light source, i.e., an LED. The data was successfully transmitted to a distance of 30 km without using any EDFA's in the network, with a reasonable BER of $4.0530{\times}10^{-14}$. We have analyzed the performance of this architecture with a control channel which exploits the broadband light source, i.e., an LED, by simulating in $Optsim^{TM}$.

• Proceedings of the Optical Society of Korea Conference
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• 1990.02a
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• pp.257-259
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• 1990

In the design of waveguide E-plane bandpass filter, it is very important to characterize the K-inverters. In the analytical method. losses arising from the metal and the dielectric are ignored for the simplicity of design process. In this paper, based on the new measurement method, characteristics of inverters are measured and compared with those calculated based on mode-matching analysis.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.31A no.10
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• pp.48-53
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• 1994

The problem of a plane wave impinging upon a semi-infinite paralle-plate waveguide is investigated. The interior fields can be analyzed by converting the initial field into vaveguide modes. Kirchhoff approximation is usually made at the waveguide aperture in the literature. In this paper, a modified approximation is made using the Uniform Gemetrical Theory of Diffraction(UTD). Numerical results show excellent agreement between UTD-supplemented mode-matching solution and UTD solution.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.32A no.4
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• pp.40-46
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• 1995

The characteristics of the shielded suspended substrate coplanar waveguide(SSCPW) are analyzed by applying the point matchning method to the quasi-TEM mode approximation. The characteristic impedances and the effective dielectric constants are also calculated by changing the height of air and dielectric layer, and the strip width of SSCPW. Approaching the side strip width of SSCPW to zero, values of characteristic impedances and effective dielectric constants are agreed well with the results obtained by the variational method.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.34D no.12
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• pp.8-13
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• 1997

In this paper, the input impedance and efficiency of rectangulr microstip patch antenna located inside a rectangular wavegudie is calculated by using the cavity model and the mode excited by te patch antenna which is modeled as an equivanlent surface magnetic current on the conducting plate. Measured return losses of a rectangular microstrip patch antenna tuned at 5.93 GHz in the free space and inside the retangular waveguide are compared and found to be in good agreement with calculated results.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.30A no.5
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• pp.24-29
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• 1993

The national standards of microwave power in X-band and Ku-band were established using the waveguide microcalorimeters and have been disseminated to the related industries to contribute to industrial development. Through the comparisons and analysis of the measured effective efficiencies for waveguide thermistor mounts in the recent years, the accuracy for maintenance of power standards was confirmed.