• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.11
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• pp.1774-1784
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• 1993

This paper presents the design, fabrication and measured results of the broadband microstrip array with a conical radiation pattern and the circular array composed of six square microstrip antenna elements. Each element antenna has the stacked structure with a parasitic element to achieve a broadband characteristic and a branch line quadrature hybrid is attached to it for the circular polarization. The design procedures and measured results of the scheme for obtaining the conical radiation pattern which is useful for the mobile communication via the satellite. Finally, the performance of the fabricated antenna is measured and compared with the theory.

• Journal of the Microelectronics and Packaging Society
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• v.22 no.4
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• pp.25-29
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• 2015

Demand for a low-cost, high-throughput, and high-resolution patterning method for fabricating devices continues to increase. The roll-to-roll (R2R) imprint lithography technique has received a great deal of attention as a means of fabricating next-generation devices. In this paper, we propose a fabrication method for polymeric planar lightwave circuit (PLC) devices that uses R2R imprint lithography. The proposed technique uses an elastomeric polydimethylsiloxane (PDMS) mold. A Si wafer with micro patterns is used as the Si master. The PDMS mold is then replicated from the Si master. By applying a precise web tension and at a given web speed, we fabricated a micro-patterned PLC device. The insertion losses were 4.0 dB for a $1{\times}2$ optical splitter. As such, the proposed method of fabricating a PLC device by the R2R process was shown to be an effective solution.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.37 no.12
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• pp.1-8
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• 2000

The analysis of cavity-backed circular microstrip antenna is performed, based on the method of moments, and verified with experimental results. The proposed algorithm was used to analyze the return loss and radiation characteristics of antenna by the variation of each associated parameter. This result was used to provide the optimum design guideline. Finally active reflection coefficient of infinite cavity-backed microstrip away was calculated to show the effect of suppressing surface wave to eliminate scan blindness.

• Proceedings of the Korean Magnestics Society Conference
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• 2002.12a
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• pp.212-213
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• 2002

전자기기의 소형화에 동반하여 동작주파수가 높아짐에 따라 여기에 이용되는 소자의 크기도 밀리 사이즈에서 마이크로 사이즈까지 작아지고 있다. 이에 따라 여기에 이용되는 각종 소자의 전기적인 값도 작아지고 있으며 허용 오차 값이 적은 정밀한 소자가 이용되고 있다. 그러나 소자의 크기와 소자값의 감소에 따라 정확하고 간편하게 그리고 많은 소자를 효율적으로 측정할 수 있는 방법이 필요하다. 특성 임피던스 50 $\Omega$을 가지는 동축선로형 프루브 제작에 대해 이미 검토하였다[1]. (중략)

• Journal of the Microelectronics and Packaging Society
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• v.9 no.2
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• pp.45-48
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• 2002

LTCC system has many kinds of advantages, like low loss, low cost of process, stability of process etc. But it is so hard to adjust the characteristics of passives in ceramic module after fabrication. So the exact prediction of behavior of components in high frequency region upper than GHz must be made. In this procedure, the exact measurement is need. In this study, many kinds of measurement Jigs are compared and optimized, and measurement methods of each parameter are designed.

• Journal of the Microelectronics and Packaging Society
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• v.9 no.2
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• pp.55-60
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• 2002

The recent trend in electronic devices has been towards light weight, low cost, high performance and improved reliability. Passive components are very important parts of microelectronic devices. The number of passive components used in hand held devices and computers continue to increase. To achieve improvements in costs, component density, performance, and reliability, embedding of these passive components into the printed circuit boards (PCBs) is required. This paper introduces the embedding of passive components, and discusses the remained challenges in the commercialization of this technique.

• Proceedings of the KIEE Conference
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• 2002.07c
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• pp.1893-1895
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• 2002

$50{\sim}100$ micron의 지름을 가지는 면광원용 마이크로 할로우캐소드형 태의 플라즈마광 어레이가 2인치 미만의 크기로 제작. 분석되었다. 본 연구에서 제작된 소자들은 금속-절연층-금속의 다층구조로 100 micron 미만의 소자두께를 가지며 $300{\sim}1200$ Torr의 Neon, Xenon 및 여러 기체 mixture에서 안정되게 구동되었고 구동전압은 $100{\sim}150V$ 범위로 관찰되었다. 이 밖에도 대면적 어레이내 소자간 병렬구동을 위한 다양한 구조의 소자들이 제작되었으며, 이들의 방전 및 발광특성, 그리고 전기적 특성이 분석되었다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.16 no.5
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• pp.144-151
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• 2017

In this paper, the antenna for parking management using wireless communication in outdoor parking environment was proposed. The proposed antenna was miniaturized by using parasitic element to reduce the size of the radiating element of the basic ${\lambda}/2$ microstrip antenna. The dimensions of the proposed antenna are $35mm{\times}35mm{\times}20.1mm$ that is 98.7% smaller than $309.1mm(0.46{\lambda}){\times}296.1mm(0.441{\lambda}){\times}20.1mm(0.029{\lambda})$ of the basic ${\lambda}/2$ microstrip antenna. The electrical characteristics of the antenna are 1.1 dBi at the center frequency of 447 MHz, an omni-directional radiation pattern on the E-plane, and $87.5^{\circ}$ of HPBW on the H-plane. The miniaturized ${\lambda}/4$ folded microstrip antenna using parasitic element has proved to be easy to mount on the wireless repeater, the sensor node installed on the ground, and the strop bar in the outdoor parking environment.

• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.2093-2095
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• 2004

본 논문은 압전소자를 구동장치로 사용한 마이크로 펌프의 제작과 실험에 관한 논문이다. 마이크로 펌프의 상부기판은 polydimethyl siloxane(PDMS)을 소재로 미세유로에 상시 닫힌 밸브가 일체화된 구조로 제작되었고, 하부기판은 polymethyl methacrylate(PMMA)를 소재로 3개의 압전 디스크가 구동기로 부착되었다. 최종적으로 상, 하부 기판은 액상 PUMS로 접합하여 제작했다. 구동기의 입력신호는 6상으로 구형파를 인가하여 연동구동하며 주파수와 전압을 가변하면서 유량을 측정하였다. 구동 주파수가 0.167 Hz이고 전압이 20 V일 때, 마이크로펌프의 1회 토출량은 104 nl이고, 유량은 1.04${\mu}{\el}$/min이다.

• Journal of the Korean Institute of Telematics and Electronics
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• v.20 no.3
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• pp.40-44
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• 1983

A wide band quasi-log periodic microstrip antenna is designed using circular-disc microstrip patches as a basic radiator. The radiating elements are series-fed by a coplanar feeding network which consists of an open circuited feed line with a branch line connected to each radiating element. Experiment results show that the values of VSWR are less than 2.3 over the range of 2.72-3.43 GHz.