• 한국통신학회논문지
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• 제21권2호
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• pp.514-525
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• 1996

In this paper, Push-push Osciplier(Oscillator + Multiplier) has been analyzed by even-odd mode analysis method. A 10GHz DRO, an Osciplier using 10GHz DRO design method and an Osciplier using even-odd mode analysis method were designed, fabricated and tested to verify this method. The measured results verified the validity of the analysis method using even-odd mode analysis.

• Journal of electromagnetic engineering and science
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• 제17권2호
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• pp.86-90
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• 2017

In this study, a novel third-order bandpass filter, which is based on a rectangular closed loop resonator, is presented. By adding a series resonator to the conventional loop resonator, the resonator's even resonant mode is split into two modes, while the odd resonant mode is not affected. Therefore, by varying the values of the series resonator elements, the resonant frequencies of two even modes can be determined independent of the odd-mode resonant frequency. In the proposed triple-mode filter design, instead of using a lumped series resonator, a T-shaped transmission line is coupled to the resonator via a small gap. To verify the design method, a filter is designed at 2.4 GHz with a bandwidth of 100 MHz. The improved performances of the proposed triple-mode filter are compared with those of the conventional dual mode filter.

• 정보저장시스템학회논문집
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• 제6권1호
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• pp.6-11
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• 2010

Researches for actuator which is appropriate to slim optical disk drive (ODD) have been progressed for a long time. Various types of actuators are suggested to secure high performances with slim thickness. In this paper, the slim actuator with symmetric electromagnetic (EM) circuit is suggested to apply slim ODD. Various EM circuits are proposed to increase EM force in the focusing and the tracking directions. Flexible mode frequencies and driving sensitivities are increased by using stress distribution and design of experiment (DOE). Consequently, final model is suggested to have high flexible mode frequencies and driving sensitivities.

• 한국통신학회논문지
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• 제19권3호
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• pp.553-559
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• 1994

본 논문에서는 마이크로스트립-슬롯 결합 선로에 대한 Green함수를 스펙트럼 영역에서 유도하고, 수치적 결과를 정확히 얻기 위해 마이크로스트림 선로와 슬롯 부분에서의 전류분호에 대한 특이점을 고려한 기저함수를 이용한 Galerkin방법을 적용하여 선로의 특성 파라미터를 계산하였다. 특히, 마이크로스트림-슬롯 결합선로의 특성 중 마이크로스트립 선로에의한 우모드(even mode)와 슬롯에 의한 기모드(odd mode)의 특성에 의한 선로의 각 특성을 구하였고, 계산 결과값의 정확성을 비교하기 위해 기존의 데이터와 비교하였다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제50권5호
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• pp.238-242
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• 2001

In this paper, we extracted design parameters for re-entrant mode microstrip directional coupler using FE(finite element) calculations. The microstrip directional coupler suffers from a poor directivity due to effect of the inhomogeneous dielectric including both dielectric substrate and air in microstrip transmission lines. Thus, the phase velocity of even mode is not equal to that of odd mode. In order to improve the directivity of microstrip directional coupler, a novel re-entrant mode microstrip directional coupler was employed. In microstrip configuration, the high directivity can be reached by matching the even- and odd-mode effective phase velocities. Through the values of capacitance obtained from 2-dimensional FE calculations, the phase velocities for each mode and the design parameter were extracted for the proposed parallel coupled-line configuration. Based on the extracted design parameter with phase matching condition, we designed and fabricated a 30dB directional coupler at 0.85GHz. Experimental results show good performance with excellent, isolation and directivity.

• 한국군사과학기술학회지
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• 제4권2호
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• pp.122-129
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• 2001

A characterization procedure for analyzing symmetric coupled MIS(Metal-Insulator-Semiconductor) transmission line is used the same procedure as a general single layer symmetric coupled line with perfect dielectric substrate from the extraction of the characteristic impedance and propagation constant for even- and odd-mode. In this paper, an analysis for a new substrate shielding symmetric coupled MIS structure consisting of grounded crossbar at the interface between Si and SiO2 layer using the Finite- Difference Time-Domain(FDTD) method is presented. In order to reduce the substrate effects on the transmission line characteristics, a shielding structure consisting of grounded crossbar lines over time-domain signal has been examined. Symmetric coupled MIS transmission line parameters for even- and odd-mode are investigated as the functions of frequency, and the extracted distributed frequency- dependent transmission line parameters and corresponding equivalent circuit parameters as well as quality factor for the new MIS crossbar embedded structure are also presented. It is shown that the quality factor of the symmetric coupled transmission line can be improved without significant change in the characteristic impedance and effective dielectric constant.

• 한국항해학회지
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• 제25권2호
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• pp.131-136
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• 2001

CATV(Cable Television) 시스템용 집중정수형 방향성 결합기의 새로운 해석법을 제안하였다. 본 논문에서는 결합선로형 방향성결합기에 대한 우·기 모드 해석법을 변성기형 방향성 결합기에 적용하였다. 측정된 우·기 모드 반사계수만을 사용하여 구한 S-파라미터의 결과와 계산치를 비교함으로서 제안된 해석법의 타당성을 입증하고, 제안된 해석법을 적용하여 설계·제작한 신호분기기는 5 MHz ∼ 4,000 MHz까지 광대역화 됨을 보였다.

• 한국전자파학회논문지
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• 제14권12호
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• pp.1321-1328
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• 2003

본 논문에서는 finite-extent backed conductor를 가지는 CPW(Coplanar waveguide) 방향성 결합기에서, 방향성의 향상을 위해 backed conductor의 가운데 부분을 적절한 길이로 제거하는 보상구조를 제안하였다. backed conductor의 가운데 부분이 적절한 길이를 가지고 제거될 경우, 결합기의 가운데 부분에서 기 모드의 유효 유전율이 크게 감소하여 전기적 길이가 달라지므로, 우 모드와 기 모드의 위상속도가 동일하게 인식된다. 따라서 결합기의 방향성은 향상이 되며, 이때 제거된 backed conductor의 적절한 길이는 결합기의 기 모드와 우 모드의 관계로부터 구하여질 수 있다. 이 보상 구조가 효과적임을 보이기 위해 1 GHz의 중심주파수를 가지는 보통의 결합도를 갖는 CPW 방향성 결합기를 설계하였으며, 기존의 구조에 비해 모의실험과 측정에서 각각 36 dB, 20 dB이상 개선된 우수한 방향성특성과 함께 우수한 정합특성을 가짐을 확인하였다.

• 한국전자파학회논문지
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• 제12권3호
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• pp.346-351
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• 2001

CATV, DBS(Direct Broadcasting Satellite) 및 CS (Communication Satellite) 시스템용 신호분기기의 새로운 해석법을 제안하였다. 본 논문에서는 결합선로형 방향성 결합기에 대한 우.기 모드 해석법을 변성기형 방향성 결합기에 적용하였다. 측정된 우.기 모두 반사계수만을 사용하여 S-파라미터의 결과와 계산치를 비교함으로써 제안된 해석법의 타당성을 입증하고, 제안된 해석법을 적용하여 설계.제작한 신호분기기는 5MHz~4,000MHz까지 광대역화되었다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 추계학술대회논문집 II
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• pp.775-779
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• 2001

In optical disk drive (ODD), disk rotation speed has been increasing rapidly to achieve high data transfer rate. High servo bandwidths for focusing and tracking actuator are required to follow dynamic disturbance by high rotation speed in ODD. However, the servo bandwidth is significantly limited by some vibration modes which are induced by the flexibility of moving part. In this work, the vibration modes affecting bandwidth of actuators are suppressed by modifying actuating force by VCM. For this, the relation between the horizontal component of the actuating force and vibration mode is analyzed and force characteristic affecting to vibration mode is obtained through electromagnetic and structural analysis using simulation program.