• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.182.1-182.1
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• 2012

태양전력 조절기는 태양전지에서 전력을 생성하여 배터리를 충전하고 인공위성의 모든 부하에 전력을 공급하는 역할을 한다. 이러한 태양전력 조절기는 신뢰성 확보와 대전류 처리를 위해 병렬운전한다. 병렬운전 시 전류가 각 태양전력 조절기에 균등하게 분배되지 않을 경우, 한 태양전력 조절기에만 과도한 전류가 흐르게 되고 해당 태양전력 조절기에 문제가 발생한다. 따라서 병렬운전 하는 각 태양전지 조절기에 전류를 균등하게 분배하기 위해 전류 제어기가 필요하다. 전류 제어 방식에는 Inner Loop방식과 Outer Loop 방식이 있다. Inner Loop방식은 전류 제어기가 태양전력 조절기의 전류를 제어하고, 전류 제어기의 기준 전압을 외부의 전압 제어기가 제어하는 방식이다. 한편, Outer Loop 방식은 전압 제어기가 태양전력 조절기의 전압을 제어하고, 전압 제어기의 기준 전압에 태양전력 조절기의 전류 정보를 더하여 전압을 제어하면서 간접적으로 전류를 제어하는 방식이다. 한편, 태양전지는 전압과 전류가 강한 비선형성 관계를 가지므로 태양전지의 동작점에 따라 태양전력 조절기의 소신호 특성이 변화하고, 이는 전류제어기 안정도에 심각한 영향을 미친다. 따라서 본 논문에서는 태양전지의 각 동작점에 관계없이 전류 제어기가 안정적으로 태양전력 조절기의 전류분배를 수행할 수 있도록 Inner Loop방식과 Outer Loop방식의 전류 제어기를 해석하고 두 방식을 비교한다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.12 no.4
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• pp.651-658
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• 2001

A novel multi-section power divider configuration is proposed to obtain wide-band frequency performance up to microwave frequency region. Design procedures for the proposed microwave broadband power divider are composed of a planar multi-section three-ports hybrid and a waveguide transformer design procedures. The multi-section power divider is based on design theory of the optimum quarter-wave transformer. Furthermore, in order to obtain the broadband isolation performance between the two adjacent output ports, the odd mode equivalent circuit should be matched by using the lossy element such as resistor. The derived design formula for calculating these odd mode matching elements is based on the singly terminated filter design theory. The waveguide transformer section is designed to suppress the propagation of the higher order modes such as waveguide modes due to employing the metallic electric wall. Thus, each section of the designed waveguide transformer should be operated with evanescent mode over the whole design frequency band of the proposed microwave broadband power divider. This paper presents several simulations and experimental results of multi-section power divider to show validity of the proposed microwave broadband power divider configuration. Simulation and experiment show excellent performance of multi section power 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 Electromagnetic Engineering and Science
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• v.18 no.4 s.119
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• pp.416-422
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• 2007

In this paper, a broadband 2-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 2:1 impedance transformer instead of the conventional 4:1 impedance transformer is realized and this 2:1 transformer is connected with the conventional bridge-type 2-way divider to form a 2-way power divider. Insertion loss of about 3.5 dB, isolation of less than -10 dB, and return loss of less than -10 dB in most band of interest are measured.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.18 no.5 s.120
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• pp.478-485
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• 2007

In this paper, an unequal 1:N Wilkinson power divider with adjustable dividing ratio is proposed. The proposed unequal power divider is composed of basic Wilkinson structure. It consists of rectangular-shaped defected ground structure (DGS), isolated island pattern in DGS, and varactor diodes of which capacitance depends on bias voltage. The characteristic impedance value of microstrip line having DGS goes up and down by controlling bias voltage for diodes, and consequently the power dividing ratio(N) is adjusted. The obtained N from measurement is $2.59{\sim}10.4$ which mean the proposed divider has adjustable unequal dividing ratio.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1646-1647
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• 2011

본 논문에서는 공통의 결함접지면구조(Defected ground structure, DGS)를 이용한 1:2 비대칭 전력 분배기를 설계하였다. 기본적인 비대칭 전력분배기를 설계하고 DGS를 삽입하여 크기를 줄이고 반으로 접은 구조로 회로의 크기를 대폭 줄일 수 있는 구조 이다. 사용한 기판으로는 Rogers 5880 31mils(0.7874mm)를 사용하여 1GHz 주파수대의 1:2 비대칭 전력 분배기를 설계 및 제작하여 우수한 특성을 확인 할 수 있었다.

• Journal of Advanced Navigation Technology
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• v.19 no.3
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• pp.224-229
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• 2015

In this paper, we derived the design equation and implemented the unequal Gysel power divider that is one external resistors using the ABCD parameters analysis. Conventional unequal Gysel divider is difficult to obtain the characteristics of isolation and return loss at between output ports because it can't select a theoretical value of external resistor. To solve those problems, we design the new unequal Gysel power divider with transmission lines and one external resistor that has the characteristics of conventional unequal Gysel divider. To validate this design method, we simulated and measured an 4: 1 unequal Gysel power divider at the center frequency 1 GHz. The measured performances agreed well with the simulation results.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.205-209
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• 2001

In this paper, we designed power divider that using cellular and PCS band as 2-way device, because each port of designed power divider have reversion that is used to divide the power or compose the power in case of the 2 way, if input port of characteristic impedance with 50$\Omega$ is loading the power then size and phase of power appear on two output port being shared to two parts equally. Usually, divider have division effect of 3dB, but divider have insertion loss when designed in this paper, we have the purpose to design that have good isolation and design that equal insertion loss with minimum insertion loss in the broadband.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.1
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• pp.384-389
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• 2011

This article presents an ultra broadband resistive power divider circuit for smart grid applications. Since the future smart grid system is expected to deploy high speed power line communication, the frequency response of the resitive power divider circuit is naturally of significance. Employing a thin film technology, the resistive power divider was designed, measured, and fabricated. For the circuit design, the conductor-backed coplanar waveguide line was firstly designed and measured. The 3 dB cutoff frequency was 72 GHz and S11 remains <-20 dB upto 70 GHz. The fabricated resistive power divider shows the 3 dB cutoff frequency of 50 GHz. It was experimentally verified that the resistive power divider circuit shows the insertion loss of 6 dB for high-speed input signal (40 Gb/s).

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.9 no.6
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• pp.715-724
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• 1998

The FDTD(Finite-Difference Time-Domain) method is applied to analyze an unequal Wilkinson power divider. Unequal Wilkinson power divider has complex structures and the standard Yee Cell modeling method is not appropriate. In this paper, nonuniform gridding and subcell modeling are used to accurately analyze the characteristics of an unequal Wilkinson power divider. For comparison, the numerical results are presented with those from a commercial circuit simulator.