• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1037-1038
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• 2011

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1155-1157
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• 2011

본 논문에서는 가전기기의 대기전력 저감을 위해 Capacitive Divider Power Supply(CDPS)로 전원을 공급받는 고효율 전원제어회로를 제안하였다. 이 제어회로는 220 V의 AC 전압을 높은 효율로 기기의 구동용 저전압 DC로 변환하기 위하여 기존의 변압기나 SMPS를 사용하는 대신 커패시터 분압기(Capacitive Divider)를 사용하여 전원을 공급하도록 제작되었으며, 대기 상태에서 교류전력선과 가전기기를 완전히 분리시킨 상태에서 적외선 수신기, MCU, 래치 타입 릴레이 등의 소자를 이용하여 기존 상용 리모컨으로도 전원제어가 가능하도록 설계되었다. 설계된 회로의 소비전력은 2.2 mW이며 본 논문에서 제안한 전원제어회로를 대기전력이 700 mW인 모니터에 적용하여 측정한 결과 대기전력이 7 mW로 낮아지는 것을 확인하였으며, 태양전지를 보조전원으로 추가 할 경우 태양전지에서 공급해주는 전력만큼 대기전력이 감소함을 확인하였다.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.55 no.9
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• pp.446-451
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• 2006

The output voltage value of AC high voltage source has been usually measured by employing the high voltage divider of inductive or capacitive type. In the study, we have developed a new method for measuring the output voltage up to 60kV using parallel plates electrode and electric field sensor, which are constructed by home-made. Unlikely the conventional method using a high voltage divider, this developed method makes it possible to extend the range of output voltage from known low voltage measurement to high voltage measurement. From the linearity measured between electric field and applied voltage in the output voltage range of 1kV-30kV, the output voltage value up to 60kV can be obtained by the electric field measurement using the electric field sensor. The output voltage value obtained using the method is consistent with that obtained using high voltage divider within corresponding uncertainties.

• Journal of Advanced Marine Engineering and Technology
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• v.34 no.4
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• pp.540-546
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• 2010

In this study, using a coplanar waveguide employing Periodic Strip Structure (PSS), highly miniaturized on-chip wilkinson power divider was realized on Si radio frequency integrated circuit (RFIC). The wilkinson power divider exhibited good RF performances from 25 to 50 GHz, and its size was $0.44{\times}0.1mm^2$, which is 4.8 % of conventional one. We also investigated the RF performances of various structures employing PSS.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.5
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• pp.676-685
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• 2001

In this paper, the design method of the meander-coupled Wilkinson power divider with slit is proposed. Because the electrical performance of this structure is varied with each coupling distance and the slit's size, a tedious design work, which is done by trial and error correction, is required to determine the values of parameters for the best suitable operation. To solve this problems, therefore, an experimental design formulas for optimum performance are presented by curve fitting, under the desired center frequency($f_0$). As the example using the proposed design equation, we designed and fabricated the meander-coupled divider at $f_0$=1.5 GHz. It has better electrical performance and measured results also agrees very well that of the simulated. From these observation, it can be concluded that the obtained design formulas are useful for design of this divider.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.18 no.8
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• pp.904-912
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• 2007

In this paper, a broadband 4-way power divider which can be used from 20 MHz to 500 MHz in the V/UHF band is designed using transmission-line transformer and ferrite toroid. A 4:1 impedance transformer is realized and this 4:1 transformer is connected with bridge-type 2-way dividers to form a 4-way rower divider, Insertion loss of about 6.8dB, isolation of less than -20dB, and return loss of less than -15dB in most band of interest are measured.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.14 no.6
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• pp.579-589
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• 1989

In this paper, planar power dividers/combiners for millimeter waves K-band or bands which can be printed on the substrates of hybrid or monolithic IC by surface mounting are designed and studied. Power dividers/combiners, and the conductor loss of microstrip lines in particualr the existing Wilkinson power dividers/combiners is modified ad amployes by ist equivalent circuit. Microwave CAD program SUPEROMPACT is employed for the Wilkinson power combiner which is modified and analyzed to reduce the high frequency coupling between the branches of the combiner, and the method to diminish the sensitivity of the input reflection of $2^n$-way power dividers/combiners is studied employing the commerical microwave CAD program package SUPERCOMPACT.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.12B
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• pp.1747-1753
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• 2001

This paper describe the design and fabrication of a SMD type Wilkinson power divider for PCS basestation. It has been designed for commercial power amplifier system by HP-ADS and fabricated with the size 0.56 $\times$ 0.35 inches. As a result, the power divider was well-operated in the frequency ranges of 1.75 ∼ 1.98GHz for the application of PCS system. The power divider reveals insertion loss 0.2dB, isolation -19.8dB, amplitude balance 0.02dB, phase balance 0.5o, input and output impedance matching -20.6dB respectively.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.11
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• pp.3094-3097
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• 2009

The use of general-purpose divider is inevitable to implement a image down-scaler when an arbitrary scaling ratio is given. To get an output at every clock from the divider, the divider should be implemented by LUT, however, its hardware size will be bigger and bigger as the precision level is increased. In this paper, a new image scaling algorithm is presented for a arbitrary scaling ratio, which do not requires a general-purpose or LUT-based divider. The proposed algorithm utilizes only comparators and adders such that the hardware size can be reduced by 1/10 compared to the conventional approaches.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.46 no.2
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• pp.147-151
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• 2009

A wideband correlator, with 45% relative bandwidth is proposed at the frequency range of 3.1-5.1GHz. The structures of the correlator components such as the delay line and the Wilkinson power divider are designed to be realized in transmission line form using the Agilent's Advanced Design System (ADS). The correlator made by using three unique wideband 3-dB couplers, rat-race coupler and one 3-dB wilkinson power divider to reach the required bandwidth. The insertion loss, amplitude imbalance and phase imbalance between ports are presented. The proposed correlator makes compact size better than correlator of conventional structure.