• The Journal of Korean Institute of Communications and Information Sciences
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• v.14 no.5
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• pp.435-441
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• 1989

The three rectangular microstrip patch antenna of Resonant length, lambda/2 or , between two slot is designed by using the ring feed line, and the radiation pattern characteristic is showen. In case of the antenna of resonant length lambda/2 the radation pattern is shown at each antenna element, in the antenna of resonant length it is shown among patch antenna element.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.30A no.5
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• pp.36-44
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• 1993

In this paper, a simple design method is represented for a contiguous-band waveguide manifold diplexer which employs a half-wavelength line at the input port of the singly terminated bandpass filterand has resonant-slot coupled E-plane T-junctions. This design method is based on the fact that the input impedance characteristics of the singly terminated bandpass filter are approximately unchanged when a resonant slot and a half-wavelength line at the input port of the filter are employed. This design method is also applicable to the design of the multiplexer. A contiguous-band waveguide manifold diplexer using the post coupled cavity filters is designed, constructed, and tested. The computed and experimental results show the validity of the theory.

• 한국정보통신설비학회:학술대회논문집
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• 2006.08a
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• pp.158-161
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• 2006

In this paper, we deal with EMI Analysis on Microstrip with Defected Ground plane. Specially, we investigate reflection, transmission, crosstalk, radiated emission on Microstrip with Defected Ground plane structure. And investigates undesired effects on various defected ground plane such as ground with split, slot, short end and open end gap. To analyze reflection, transmission and crosstalk of microstrip with defected ground plane, we used concept of the microstrip to slot line transition model. Besides, investigate radiated emission using FDTD Commercial tools such as CST MW

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.10
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• pp.65-70
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• 2008

We design and fabricate the 94 GHz Coplanar waveguide(CPW)-to-rectangular waveguide transition that is transmits signal smoothly between the CPW, which is a popular transmission line of the planar circuits, and rectangular waveguide for the 94 GHz transceiver system. The proposed transition composed of the unilateral fin-line taper and open type CPW-to-slot-line transition is based on the hard and inflexible sapphire for the flip-chip bonding of the planar MMICs using conventional MMIC technology. We optimize a single section transition to achieve low loss by using an EM field solver of Ansoft's HFSS and fabricate the back- to-back transition that is measured by Anritsu ME7808A Vector Network Analyzer in a frequency range of $85{\sim}105$ GHz. From the measurement and do-embedding CPW with 3 mm length, an insertion and return loss of a single-section transition are 1.7 dB and more an 25 than at 94 GHz, respectively.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.18 no.3 s.118
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• pp.257-264
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• 2007

In this paper, we have designed and fabricated a wide-band and high gain antenna which can integrate a standard of IEEE 802.1la$(5.15\sim5.25\;GHz,\;5.25\sim5.35\;GHz,\;5.725\sim5.825\;GHz)$. We inserted a parallel dual slot into a rectangular patch to have wide-band, and we offset an element of capacitance from the slot by using coaxial probe feeding method. We also designed a converter of $\lambda_g/4$ impedance with taper type line so that wide-band impedance can be matched easily. We finally designed structure with $2\times2$ array in order to improve the antenna gain, and the final fabricated antenna could have a good return loss(Return loss$\leq$-10 dB) and a high gain(over 13 dBi) at the range of $5.01\sim5.95\;GHz(B/W\doteqdot940\;MHz)$.

• 제어로봇시스템학회:학술대회논문집
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• 2002.10a
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• pp.88.2-88
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• 2002

1. introduction 2. FDTD Method 3. Guidelines 4. Simulation Result 5. Conclusion

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.1672-1675
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• 2003

Microstrip antennas have many applications in wireless communication system. This paper propose a analytical far-field pattern of radiation for application of the wireless communication. The triangular slot antenna fed by micorstrip line is proposed at resonance frequency 10 GHz. The simulation results of the electromagnetic field radiation pattern, S parameter, characteristic of input impedance are obtain by using the finite difference time domain (FDTD) method. The analytical space in FDTD analysis are $50{\times}171{\times}120$ cells with the cell dimension ${\Delta}x=0.152\;mm$, ${\Delta}y={\Delta}z=0.15\;mm$.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.33A no.6
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• pp.62-71
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• 1996

In this paper, we design tripel-mode channel filter using iris optimization technique and investigate its response. The cavity diameter is determined to resonate three orthogonal modes coincidently and inter-cavity iris is optimized in which one slot control one TE-TE mode and other TM-TM mode couplings simultaneously. Since the electric/magnectic field is variable due to slot position, the center position of the slot which handle coupling coefficients of two modes should be designe dwith optimizatin technique presented here. The implemented triple-mode filter in this paper saves its mass and volume upto 33% relating to the dual-mode filter, caused by the reduced number of cavities.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.24 no.6
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• pp.581-585
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• 2013

A technique to expand the operating impedance bandwidth of a microstrip patch antenna is presented. The antenna is fed by a truncated T-shaped microstrip line on the ground plane with the rectangular slot. The proposed microstrip patch antenna offers wide bandwidth characteristics with the rectangular slot which has optimized size and position on the ground plane. The simulation result shows a fractional bandwidth of 127.8 %(0.65 to 2.95 GHz) at VSWR 2:1.

• Proceedings of the KIEE Conference
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• 2006.07e
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• pp.59-60
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• 2006

A shorted-turn test was performed at the Pyungtaek combined cycle power plant on gas turbine generators. The test was conducted using a permanent flux probe and on-line shorted-turn diagnosis system. The permanent flux probe installed in the generator air gap senses the field winding slot leakage flux and produces a voltage proportional to the rate of change signature unique to each field winding. We have also applied a voltage waveform analysis technique that can identify the pole location, slot number and number of shorted-turn with each slot.