• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.2 no.2
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• pp.19-24
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• 1991

This paper propose a new taegeuk shaped directional couper and verify the possibility of high power division rate in those directional coupler through the experiments. We took the taegeuk shaped structure in those proposed directional coupler to utilize a $3\lambda/4$ section of hybrid ring directional coupler actively, and calculated the branch admittances, which satisfied the condition of perfect matching and isolation in the center frequency, by even odd mode analyzing methodes. On the result, we knew that it can be realized a much higher power division rate than reported result in same circuit area within the producible resistance limit in the microstrip line, made the taegeuk shaped directional couplers with 0, 8, 16 dB power split ratio in the 10 GHz frequency using CGP - 502 plate, and confirmed the validity of theory through the experiments.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1996.06a
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• pp.217-221
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• 1996

• Journal of Advanced Navigation Technology
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• v.24 no.4
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• pp.299-304
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• 2020

This paper proposes the design of circular sector shaped power divider-combiner with a planar structure. This structure can be constructed in series, and due to the circular sector shape, it is possible to simplify circuit configuration and improve the amplitude and phase balanced characteristics of the output. It has a simple input matching circuit and an RC parallel circuit was inserted between the output ports to improve the reflection coefficient and isolation of the output. Since the designed divider-combiner are structurally designed in a symmetrical shape of a sector, even if the output ports are composed of two or four output ports, they have excellent characteristics with an amplitude balance of ± 0.1 dB and a phase balance of ± 1o between outputs. To prove these characteristics, it was confirmed that the characteristics of the planar power divider-combiner fabricated at an operating frequency of 2 GHz are in good agreement with the simulation.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.10 no.1
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• pp.142-149
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• 1999

In this paper, Aperture-coupled microstrip array antenna was designed and manufactured for satellite communication at Ka-Band. We analyzed a microstrip radiation element and designed power divider using $\lambda$g/4 transformer and T-junction power divider. A manufactured Aperture-coupled $2\times2$ microstrip array antenna has a resonant frequency of 20 GHz. The experimental results are as followings : resonant frequency of 19.62 GHz, VSWR 1.0692, return loss -29.61 dB, Bandwidth 1.76 GHz and -3 dB beamwidth $42^{\circ}$.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.20 no.10
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• pp.1107-1113
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• 2009

In this paper, the design and implementation of K-Band frequency dividers using 130 nm CMOS process are presented. A Miller frequency divider is presented, which realizes a division range from 20 to 25 GHz with 7.2 mW power consumption from 1.2 V supply. The layout size of the core circuit is about $315{\times}246\;um^2$. In addition, a CML frequency divider which divides the output signal of the Miller frequency divider is also presented, which realizes a division range from 8.5 to 13 GHz with 5.7 mW power consumption. The layout size of the CML core is about $91{\times}98\;um^2$. Cascading the Miller and CML frequency dividers, we confirmed the divide-by-4 operation for the input signal from 20 to 25 GHz.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.20 no.8
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• pp.680-687
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• 2009

In this paper, we propose a substrate integrated waveguide(SIW) power divider to yield excellent broadband isolation performance. In order to achieve high broadband isolation, a two stage Wilkinson power divider is employed in SIW. The measurement results show the insertion loss($S_{21}$, $S_{31}$ to be $4.0{\pm}0.5$ dB) and input return loss($S_{11}$ of 10 dB) from 13.12 GHz to 16.14 GHz. Moreover, the results show that the output return loss and isolation between output ports are larger than 10 dB between 10.37 GHz and 17.64 GHz.

• 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 the Institute of Internet, Broadcasting and Communication
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• v.15 no.4
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• pp.87-92
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• 2015

In this Paper, we proposed optimization of system performance, optimal splitting factor ${\alpha}$ applied to power splitting protocol with relay protocol with decode and forward undergo co-channel interference. We can possible to optimize and maximize the channel capacity of the receive performance and the efficiency of the network through optimal factor of splitting protocol. We verified BER performance and Channel capacity and Outage probability for the proposed scheme over Rayleigh fading through Monte-Carlo simulation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.18 no.4
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• pp.499-508
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• 1993

This paper has dealt with the design methods and the analysis of frequency characteristics for the power splitters with ferrite toroids, which are extensively used in CATV and/or MATV systems. The theoretical design methods and frequency characteristics of the prototype Wilkinson's 2-way power divider have been reviewed in lumped-element circuits form. On the basis of the design theory of the prototype Wilkinson's power divider, the method compensating of the prototype Wilkinson's power divider has been proposed by means of adding matching transformers. Thus, it has been shown that the theoretical frequency characteristics of the compensated power splitter are improved drastically in comparison with the prototype Wilkinson's power divider. Furthermore, the practical measurements of the frequency characteristics for the fabricated circuits show agreements with the theoretical results, and hence, the validity of the proposed design and analysis methods has been confirmed.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.11a
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• pp.23-25
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• 2014

에너지 하베스팅 기술은 외부의 지속적인 에너지 공급 없이 통신 시스템의 수명을 오랫동안 유지할 수 있는 수단의 하나로 각광받고 있다. 최근에는 수신한 신호에서 에너지를 얻는 전력 분배의 기법이 제안되었다. 본 논문에서는 인지 무선 통신 시스템에서 이차 사용자가 에너지 하베스팅을 사용하는 중계기를 사용할 때 중계기들 중 하나를 선택하는 기법의 불능 확률을 분석한다. 중계기는 전력 분배의 기법을 사용하여 에너지를 저장하며 선택된 중계기는 수신한 신호를 복호 후 전송한다. 컴퓨터 시뮬레이션을 통해 간섭 제약 조건과 이차 사용자의 중계기 수가 달라질 때의 불능 확률을 살펴본다.