• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.6 no.4
• /
• pp.604-609
• /
• 2002

Microstrip - slot line transitions are analyzed in the spectral domain. Some kinds of transitions which depend on the orientation angle between two lines and the stub types are designed and fabricated at 5GHz. It is shown that experiment results of the transition are in good agreement with those obtained from spectral domain analysis.

• Journal of the Korean Institute of Navigation
• /
• v.22 no.1
• /
• pp.15-22
• /
• 1998

In this paper, discontinuity parts in microstrip line with $\lambda$/4 open stub and one in crank type have been anlayzed by using FDTD(Finite-Difference Time-Domain) analysis method. The noise components, in this case, are occred at the discontinuites of the given microstrip lines, the complex poles were extracted by the analysis using GPOF (Generalized Pencil-of Function) method from electric field of time domain. It has, then, been found that the noise level and the noise frequency components included in signal could be derived.

• 한국ITS학회:학술대회논문집
• /
• v.2006 no.10
• /
• pp.175-178
• /
• 2006

• Proceedings of the Korean Institute of Communication Sciences Conference
• /
• 2004.07a
• /
• pp.321-321
• /
• 2004

• Proceedings of the Korea Concrete Institute Conference
• /
• 1997.10a
• /
• pp.769-776
• /
• 1997

An integral abutment bridge refers to a jointless bridge with capped-pile stub type abutment. It has been used for more than 50 years in the United States and Canada. This paper briefly describes design and utilization of the PC beam integral abutment bridge which is adapted for Korea and shows its excellent performance compared with that of a jointed bridge. This study introduces the characteristics of structural behaviors of the integral bridge and also mentions about its attributes and limitations.

• Journal of the Korea Computer Industry Society
• /
• v.9 no.5
• /
• pp.217-222
• /
• 2008

The characteristics of UHF antenna with microstrip structure was studied. Design parameters as center frequency, band width, and VSWR by slot length, stub was analyzed by HFSS simulator. UHF antenna with microstrip structure was fabricated using FR4_epoxy substrate of 4.4 dielectric constant.

• ETRI Journal
• /
• v.34 no.3
• /
• pp.454-457
• /
• 2012

A miniaturized planar digital video broadcasting terrestrial (DVB-T) antenna, which is composed of a patterned helical line, an open stub, and an impedance matching circuit on an FR4 (${\varepsilon}_r$=4.4) substrate for portable media player applications, is presented in this letter. The antenna has monopole-like, omni-directional radiation characteristics and a wide impedance bandwidth (VSWR<3) in the DVB-T band from 174 MHz to 230 MHz at the VHF band.

• Proceedings of the KSR Conference
• /
• 2002.10a
• /
• pp.509-515
• /
• 2002

Recently, the microprocessor with network function based control system instead of conventional microprocessor is widely used for industrial applications, and also these technologies are widely adopted for train control and monitoring in modem rapid transit system. The purpose of this paper is to propose a criteria for data transmission, which was designed and realized through Korea High Speed Train. Noise, distortion and attenuation are always present in data transmission system and strictly limit performance. This paper describes a method to calculate the propagation constant, attenuation constant, phase velocity and length of stub.

• Journal of Korean Society of Steel Construction
• /
• v.17 no.3 s.76
• /
• pp.357-363
• /
• 2005

There is a great need for high-strength steel especially for the high-rise steel building structure. High-strength steels, however, may have mechanical properties that are significantly different from those of the conventional steels. The application of high-strength steels to building structures should be reviewed as to whether the inelastic behavior equivalent to that of conventional steels can be attained or not. In this study, SM570TMC steel was tested to evaluate buckling strength under axial compressive force. The comparison tests for local buckling strength evaluation of box-type and H-shaped welded columns were performed with variable width-thickness ratios. As for the experimental check, the maximum strength of stub column was determined by local buckling as far as the limit of width-to-thickness ratio was satisfied with current design codes. Also, the strength of the stub column did not decrease suddenly by local buckling before maximum strength even when the ratio is not satisfied. The buckling strength of SM570TMC steel was higher than both ASD (Allowable Stress Design) and LRFD (Load and Resistance Factor Design) specifications.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.7 no.6
• /
• pp.38-47
• /
• 2008

In this paper, the narrow band-pass filter with compact-size using the ${\lambda}g/2$ open stubs is proposed. The filter size is reduced by realization of transmission line at second harmonics and at the same time the power can be transferred to the output by using the fundamental wave generated in the resonator and the transmission line in which the impedance mismatch technique is adopted. Thus, the proposed filter can be reduced to half-length of horizontal transmission line than the conventional one. The experimental results show that insertion loss is 1.58 dB and return loss is 9.86 dB, and the fractional bandwidth is 10 % at the center frequency of 5.8 GHz. The filter size is $10.34{\times}18.56\;mm2$.