• Title, Summary, Keyword: 평면크기 영향

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Effect of Finite Substrate Size on the Radiation Characteristics of H-plane Linear Array Antennas (유한한 기판 크기가 H-평면 선형 배열 안테나의 방사 특성에 미치는 영향)

  • Yoon, Young-Min;Kim, Boo-Gyoun
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.5
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    • pp.39-49
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    • 2013
  • The effect of the finite substrate size on the radiation characteristics of H-plane linear microstrip array antennas is investigated. The radiation characteristics versus scan angle are systematically analyzed for 5-element H-plane linear array antennas with various substrate sizes and element spacings for the substrates with different dielectric constants. The distance between the antenna center and the substrate edge on the E-plane for the enhancement of the radiation characteristics of the array antenna is presented.

Effect of a Finite Substrate on the Radiation Characteristics of a Linear Phased Array Antenna Positioned along the E-plane (유한한 기판 크기가 E-평면으로 배열된 선형 위상 배열 안테나의 방사 특성에 미치는 영향)

  • Kim, Tae-Young;Kim, Gun-Su;Yoon, Young-Min;Kim, Boo-Gyoun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.48 no.5
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    • pp.46-53
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    • 2011
  • The effect of a finite substrate on the radiation characteristics of a linear 7-element array antenna positioned along the E-plane is investigated. Active reflection coefficients and average active element patterns are simulated for various substrate sizes. The E-plane radiation pattern of a fully excited array for various scan angles is correlated with the active reflection coefficient and average acitive element pattern. The effect of E-plane substrate size on the radiation characteristics of a linear array along the E-plane is larger than that of H-plane substarte size.

Effect of a Finite Substrate Size on the Radiation Characteristics of Two-Element Linear E-plane Array Antennas (유한한 기판 크기가 2소자 E-평면 선형 배열 안테나의 방사 특성에 미치는 영향)

  • Yoon, Young-Min;Kim, Boo-Gyoun
    • Journal of the Institute of Electronics and Information Engineers
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    • v.49 no.12
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    • pp.95-110
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    • 2012
  • The effect of a finite substrate size on the radiation characteristics of a two-element linear E-plane array antenna using microstrip patch antennas is investigated. The average active element pattern characteristics of two-element E-plane array antennas printed on different dielectric constant substrates with various substrate sizes and element spacings are analyzed. Using the average active element pattern, the radiation pattern characteristics of the array antenna versus scan angle is analyzed. The simulation results show that the diffracted fields of surface waves from substrate edges have a significant effect on the radiation characteristics of a 2-element E-plane array antenna. The distance between the center of patch antenna and the substrate edges on the E-plane for the enhancement of radiation characteristics of the array antenna is about $0.35{\lambda}_0$.

Study on sonar beam design considering the interaction effects in planar arrays (소자간 간섭을 고려한 평면 배열 소나 빔 설계 기법 연구)

  • 송준일
    • Proceedings of the Acoustical Society of Korea Conference
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    • pp.155-158
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    • 1998
  • 본 논문에서는 2차원 평면 배열에서 소자들간의 간섭 영향을 빔 설계 기법을 제안한다. 실제적으로 빔을 구현할 때, 소자간 간섭이 전체 빔 패턴을 변화시키게 되어 성능을 저하시킬 수 도 있다. 따라서 보다 정확하게 빔을 설계하기 위해서는 소자간의 간섭 영향을 고려한 빔 설계 기법이 필요하게 된다. 본 논문에서는 특성을 알고 있는 소자로 구성된 평면 배열에서 다른 소자에 의한 간섭을 예측한 후 이것을 각 소자의 가중치에 포함 시켜 원하는 사양의 빔을 설계할 수 있도록 한다. 빔 설계방법으로는 선형 최소자승법을 이용하여 빔의 부엽준위의 위치와 크기를 변화시키면서 원하는 조건의 빔 가중치를 얻어내는 알고리듬을 도입하였다.

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Impact of Substrate Size on the Radiation Characteristics of an H-plane 5-Elements Linear Aperture Coupled Microstrip Patch Array Antenna (기판 크기가 H-평면 5소자 선형 개구면 결합 패치 배열 안테나의 방사 특성에 미치는 영향)

  • Bak, Hye-Lin;Kim, Jae-Hyun;Kim, Boo-Gyoun
    • Journal of the Institute of Electronics and Information Engineers
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    • v.53 no.6
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    • pp.37-45
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    • 2016
  • The effect of substrate size on the radiation characteristics of an H-plane 5-elements linear array antenna with an aperture coupled microstrip patch antenna (ACMPA) as unit element is investigated. The distance between the patch center and the substrate edge on the E-plane ($d_E$) and that on the H-plane ($d_H$) at which the maximum broadside gain of an H-plane 5-elements linear array antenna occurs are the same to those of single ACMPA using a unit element. Besides, $d_E$ and $d_H$ at which the minimum broadside gain of an H-plane 5-elements linear array antenna occurs are almost the same to those of single ACMPA using a unit element. The edge effect on the radiation characteristics of an H-plane 5-elements linear array antenna is mainly determined by $d_E$. The optimum substrate size for the radiation characteristics of an H-plane linear array antenna could be obtained from that of single ACMPA using a unit element of an H-plane linear array antenna.

Effect of finite conductive image planes on PCB radiation (유한 도전성 영상 평면이 PCB 전자파 복사에 미치는 영향 분석)

  • Kim, Jin-Suk;Cho, Kwang-Yun;Kim, Nam
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.23 no.4
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    • pp.836-845
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    • 1998
  • In this ppaer, the confguration of multi-layers of the image planes surrounding the current trace of inite width has been considered, and the shielding performance of image planes is analyzed with the parameters of the width and conductivity of the planes, and the distance between the current trace and the planes. The induced current distributions on the image planes have bgeen calculated by solving a set of electric field integral equations by the method of moments. To cacluate the current distribution on the planes effectively, a new method for dividing integral intervals is proposed.

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Assessment of In-plane Size Effect of Nuclear Materials Based on Damage Mechanics (손상역학에 근거한 원자력 재료의 평면크기 영향 분석)

  • Chang Yoon-Suk;Lee Tae-Rin;Choi Jae-Boong;Seok Chang-Sung;Kim Young-Jin
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.4
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    • pp.393-401
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    • 2006
  • The influences of stress triaxiality on ductile fracture have been investigated for various specimens and structures. With respect to a transferability issue, recently, the interests on local approaches reflecting micromechanical specifics are increased again due to rapid progress of computational environments. In this paper, the applicability of the local approaches has been examined through a series of finite element analyses incorporating modified GTN and Rousselier models as well as fracture toughness tests. The ductile crack growth of nuclear carbon steels is assessed to verify the transferability among compact tension (CT) specimens with different in-plane size. At first, the basic material constants were calibrated for standard CT specimens and used to predict fracture resistance (J-R) curves of larger CT specimens. Then, the in-plane size effects were examined by comparing the numerically estimated J-R curves with the experimentally determined ones. The assessment results showed that the in-plane size effect should be considered for realistic engineering application and the damage models might be used as useful tool for ductile fracture evaluation.

Miniaturization of UHF Planar Antenna Employing Slot-loading (Slot-loading에 의한 UHF 대역 평면 안테나의 소형화 설계)

  • Chun, Joong-Chang;Lee, Dong-Hyun;Kim, Tae-Soo
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.685-688
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    • 2008
  • Planar antennas are very efficient for the use of the out-door data transmission applications due to their low-profile characteristics. But the size of the antenna in UHF band blocks the practical usage. In this paper, a miniaturized planar antenna is investigated for the application of AMR system in UHF band. The designed antenna is fabricated in the form of the microstrip patch on the FR-4 substrate. The miniaturization is achieved by slot-loading on the patch. First, effects of simple slots on the size reduction are analyzed, followed by the design using more complex slots resulting in the reduction ratio of 37.9% in 425.6 MHz and bandwidth of 3.8 MHz. The effect of epoxy coating for the protection is also investigated.

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Miniaturization of UHF Planar Antenna Employing Slot-loading (슬롯 장하에 의한 UHF 대역 평면 안테나의 소형화 설계)

  • Chun, Joong-Chang;Lee, Dong-Hyun;Kim, Tae-Soo;Kim, Hyun-Deok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.6
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    • pp.979-983
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    • 2008
  • Planar antennas are very efficient for the use of the out-door data transmission applications due to their low-profile characteristics. But the size of the antenna in UHF band blocks the practical usage. In this paper, a miniaturized planar antenna is investigated for the application of AMR system in UHF band. The designed antenna is fabricated in the form of the microstrip patch on the FR-4 substrate. The miniaturization is achieved by slot-loading on the patch. First, effects of simple slots on the size reduction are analyzed, followed by the design using more complex slots resulting in the reduction ratio of 37.9% in 425.6 MHz and bandwidth of 3.8 MHz. The effort of epoxy coating for the protection is also investigated.

유전체 물질을 삽입한 N-channel FinFETs의 전기적 특성

  • An, Jun-Seong;Kim, Tae-Hwan
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.301.2-301.2
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    • 2014
  • 집적회로의 밀도가 높이기 위해 단일 소자의 크기를 줄이는 과정에서 발생하는 소자의 성능 저하를 줄이기 위해 새로운 구조 및 구성 물질을 변경하는 연구가 활발하게 진행되고 있다. 기존의 평면 구조를 변형한 3차원 구조의 n-channel FinFet는 소자의 구성 물질을 바꾸지 않고도 쇼트 채널효과와 누설전류를 줄일 수 있다. 다양한 구조의 유전 물질을 응용한 n-channel FinFEET은 기존의 n-channel FinFET보다 소자의 크기를 줄일 수 있는 가능성을 제시하고 있다. FinFETs에 관한 많은 연구가 진행되어 왔지만, 유전체 물질을 이용한 n-channel FinFETs의 구조에 대한 연구는 매우 적다. 본 연구는 FinFET의fin channel 영역에 유전 물질을 삽입하여 그 영향을 분석한 연구이다. FinFET의 fin channel 영역에 유전 물질을 삽입하여 평면 구조의 MOSFET에서 fully depletion SOI 구조와 같은 동작을 하도록 만들었다. 유전 물질을 삽입한 FinFET 소자의 전기적 특성을 3차원 TCAD 시뮬레이션을 툴을 이용하여 계산하였다. 유전 물질을 삽입한 n-channel FinFET에서 전자 밀도와 측면 전계의 영향이 기존의 FinFET보다 좋은 특성을 확인하였다. 또한 유전물질을 삽입한 FinFETs은 subthershold swing, 누설전류, 소비전력을 줄여 주었다. 이러한 결과는 n-Channel FinFETs의 성능을 향상시키는데 많은 도움이 될 것이다.

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