• 한국통신학회논문지
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• 제25권3A호
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• pp.424-429
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• 2000

본 논문에서는 준정적 해석방법을 사용하여 다층 구조에서 유한한 도체 두께를 갖는 비대칭결합 마이크로스트립(ACM: Asymmetric Couple Microstrip) 선로의 특성을 연구하였다. 준정적 해석방법으로서 모드정합법을 이용하였으며, ACM 선로의 특성 임피던스와 유효 유전율 상수가 도체 두께의 함수로 나타나는 결과를 얻었다. 수치해석 결과를 통해서 단층 및 다층구조에서 도체 두께의 변화로 인하여 ACM 선로의 전파특성이 변화되는 것으로 나타났다.

• Transactions on Electrical and Electronic Materials
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• 제10권2호
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• pp.53-57
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• 2009

In this paper we develop a method to observe faults in semiconductor devices and transmission lines by calculating the variation of the reflection function in a dielectric microstrip line that has an open-ended termination containing an optically induced plasma region. It is analyzed with the assumption that the plasma is distributed homogeneously in laser illumination. With the non linear material of degradation, the concentration of the carrier in the part of the material has changed. Since the input wave has produced the phenomenon of reflection, the input signal to the open-ended microstrip lines can be observed on reflection to identify the location of the fault. The characteristic impedances resulting from the presence of plasma are evaluated by the transmission line model. The variation of the reflection wave in the microwave system has been calculated by using an equivalent circuit model. The transient response has been also evaluated theoretically for changing the phase of the variation in the reflection. The variation of characteristic response in differentially localized has been also evaluated analytically.

• 한국통신학회논문지
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• 제35권5A호
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• pp.513-518
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• 2010

전압제어 발진기의 위상잡음 특성을 개선하기 위해 결합 마이크로스트립라인을 이용하여 공진주파수를 동조하는 변형된 구조의 주파수 동조회로를 제안한다. 위상잡음 특성이 개선됨을 실험적으로 입증하기 위해 주파수 동조회로를 제외하면 같은 구조를 갖는 2개의 9.8GHz HEMT 전압제어 발진기를 설계 및 제작하였다. 측정결과 결합마이크로스트립라인의 주파수 동조회로를 갖는 제안된 구조의 전압제어 발진기가 일반적인 전압제어 발진기에 비해 100KHz 오프셋 지점에서 8dBc/Hz 이상의 위상잡음 특성 개선효과를 나타내었다.

• 한국통신학회논문지
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• 제29권1A호
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• pp.77-83
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• 2004

초고주파 회로에서 광범위하게 이용되는 평행 결합 마이크로스트립 대역통과필터는 좁은 대역폭 과 2차 스프리어스 통과대역으로 필터의 응용을 제한한다. 이와 같은 문제를 해결하기 위해서 복합 유전체기판상에 비대칭 결합 마이크로스트립 선로를 이용하는 방법을 제시하였다. closed-form해석방법을 이용하여 복합 유전체기판상에 비대칭 결합 마이크로스트립 선로를 해석하고 중심주파수 9GHz 에서 정규화 대역폭 $33\%$을 갖는 필터를 제작하였다. 단층기판을 갖는 필터와 비교하면 복합 유전체기판을 이용한 필터는 스프리어스 통과대역이 약 20dB 이상 개선됨을 보였다

• 한국전자파학회논문지
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• 제13권4호
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• pp.401-406
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• 2002

마이크로스트립 다층 구조 회로가 MMIC 분야에서 다양하게 적용되고 있다. 이에 따라 서로 다른 높이를 갖는 유전체 층 사이의 효율적인 마이크로스트립 선로 전송을 위해 3차원 계단형 불연속을 갖는 선로에서의 정확한 전달 특성 해석, 등가회로의 유도가 요구된다. 본 연구에서는 FDTD 수치해석 방법과 측정을 통해 얻어진 불연속면의 5 파라미터를 이용하여 T 형 등가회로와 소자 값들을 유도하였으며, 해석 및 측정 결과는 1~5 ㎓ 범위에서 잘 일치함을 확인할 수 있었다.

• 한국통신학회논문지
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• 제23권6호
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• pp.1425-1432
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• 1998

The propagation properties of Gaussian pulse signals on the microstrip line are investigated by the Kirschning & Jansen's approximated equation to meet the frequency range of a pulse, accuracy, and geometrical requiremtns of the microstrip line. The dispersion of pulse signals is analyzed regarding to the relative permittivity .epsilon.$_{r}$, substrate height h and strip width w of the microstrip line. To verify theoretical results, several samples of 50.OMEGA. microstrip lines are fabricated. And the characteristics of pulse propagation along these lines are simple measured using VNA(Vector Network Analyzer) with time-domain analysis function. A fairly good agreement has been found between the measured pulse waveforms and computer simulations.

• JSTS:Journal of Semiconductor Technology and Science
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• 제5권3호
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• pp.204-209
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• 2005

A small size broadband microstrip patch antenna with small ground plane has been fabricated using MEMS. Multiple layer substrates are used to realize small size and broadband characteristics. The microstrip patch is divided into 3 pieces and each patch is connected to each other using a metal microstrip line. The fabrication process is simple and only one mask is needed. Two types of microtrip antennas are fabricated. Type A is the micros trip antenna with metal lines and type B is the microstrip antenna without metal lines. The size of proposed microstip antenna is $8^{*}12^{*}2mm^{3}$ and the experimental results show that the antenna type A and type B have the bandwidth of 420 MHz at 5.3 GHz and 480 MHz at 5.66 GHz, respectively.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.603-604
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• 2006

A small size broadband microstrip patch antenna with small ground plane has been fabricated using MEMS. Multiple layer of high and low dielectric substrates are used to realize small size and broadband characteristics. The microstrip patch is divided into 4 pieces and each patch is connected to each other using a metal microstrip line. The fabrication process is very simple and only one mask is needed. Two types of microtrip antennas are fabricated. Type A is the microstrip antenna with metal lines and type B is the microstrip antenna without metal lines. The size of proposed microstip antenna is $8*12*2mm^3$ and the experimental results show that the antenna type A and type B have the bandwidth of 420MHz at 5.3 GHz and 480MHz at 5.66 GHz, respectively.

• 전자공학회논문지A
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• 제29A권7호
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• pp.31-38
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• 1992

In this paper, numerical analysis package using Time-Domain Finite Difference (TDFD) method is developed to solve the initial value problem of Maxwell's equation and applied to several microstrip structures. TDFD allows us to show graphically the evolution of the crosswalk between microstrip lines. Moreover, we can obtain transmission line parameters and scattering parameters through Fourier transform of TDFD results in easy and efficient ways. TDFD is successfully applied to :1) wide band electromagnetic wave propagation along the single microstrip line, 2) crosswalk analysis between two microstrip lines, and 3) three metal line side-coupled filter. Our results show much better agreement with other theoretical experimental results reported in the literature. Thus we expect that TDFD is very useful to designing MMIC(Monolithic Microwave Integrated Circuit).

• KIEE International Transactions on Electrophysics and Applications
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• 제4C권5호
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• pp.236-240
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• 2004

In this paper we examine the reflection characteristics of dielectric microstrip lines with open-ended termination containing an optically induced plasma region, which are analyzed by the assumption that the plasma is distributed homogeneously in laser illumination. The characteristics impedances resulting from the presence of plasma are evaluated by the transmission line model. To estimate theoretically the characteristic response of identical systems in the time domain, the Fourier transformation method is evaluated. The reflection characteristics of time and frequency response in microwave systems have been calculated using an equivalent circuit model.