• 제목/요약/키워드: Electrical beam tilt

검색결과 31건 처리시간 0.03초

Tilt Angle Generation in NLC on Homeotropic Polymer Surface with Ion Beam Irradiation as a Function of Incident Angle

  • Lee, Sang-Keuk;Seo, Dae-Shik;Choi, Dai-Seub
    • Transactions on Electrical and Electronic Materials
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    • 제9권3호
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    • pp.120-122
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    • 2008
  • We have studied the tilt angle generation on the homeotropic polyimide (PI) surface using a low intensity ion beam source as a function of incident angle. An excellent LC alignment of nematic liquid crystal (NLC) on the PI surface with ion beam exposure for all incident angles was observed. The tilt angle of NLC on the homeotropic PI surface for all incident angles was from 90 to 88 degree was observed. Also the tilt angle of NLC on the homeotropic PI surface with ion beam exposure of 400 eV had a tendency to increase as ion beam energy incident angle become more instance from 45 degree. Finally, a good LC alignment thermal stability on the homeotropic PI surface with ion beam exposure can be achieved.

Alignment Effect of a Nematic Liquid Crystal on Deposited SiOx Thin-Film Surface with e-beam Evaporation

  • Oh, Yong-Cheul;Lee, Dong-Gyu
    • Transactions on Electrical and Electronic Materials
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    • 제7권6호
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    • pp.305-308
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    • 2006
  • We have studied liquid crystal (LC) aligning capabilities for homeotropic alignment and the control of tilt angles on the $SiO_{x}$ thin film by electron beam evaporation method. A high tilt angle of about $86.5^{\circ}$ was obtained, and also the suitable tilt angle of the NLC on the $SiO_{x}$ thin film at $20{\sim}50\;nm$ thickness with e-beam evaporation can be achieved. The uniform LC alignment on the $SiO_{x}$ thin film surfaces with electron beam evaporation can be achieved. It is considerated that the LC alignment on the $SiO_{x}$ thin film by electron beam evaporation is attributed to elastic interaction between LC molecules and micro-grooves at the $SiO_{x}$ thin film surface created by evaporation.

Ku-Band용 위성 배열 안테나 설계 및 제작 (The Design and Fabrication of Satellite Array Antenna for Ku-Band)

  • 이한영
    • 전기학회논문지
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    • 제61권11호
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    • pp.1668-1670
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    • 2012
  • In this paper, a satellite array antenna operates at 12.2GHz~12.75GHz was designed and fabricated. The lowest height and high gain electrical beam tilt was obtained by applying backed slot and sub-reflector widening the distance between the patch and the GND. The simulation and measurement showed good agreements, the electrical beam tilt was $10^{\circ}$, the gain was 26.5dBi, the VSWR was less than 3:1 and the return loss was less than -15dB.

이온빔 배향을 이용한 수직 폴리이미드 표면에서의 틸트 각 제어 (Control of Tilt Angle on Homeotropic Polyimide Surface by Ion Beam Alignment)

  • 강동훈;김병용;강상훈;황정연;한진우;김종환;강희진;옥철호;오용철;서대식
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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    • pp.288-289
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    • 2006
  • The tilt angle generation of nematic liquid crystal(NLC) on the homeotropic polyimide(PI) surface by the new Ion beam alignment method is studied. The tilt angle of NLC on the homeotropic PI surface for all incident angle is about 38and this has a stabilization trend. And the good LC alignment of the NLC on the PI surface by ion beam exposure of 45Incident angle was observed. Also the tilt angle of NLC on the homeotropic PI surface by ion beam exposure of 45Incident angle had a tendency to decrease as ion beam energy density increase. So we had known that pretilit angle could be controlled from verticality to horizontality.

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이온빔 배향에 의한 수직 배향막의 액정 배향 (Vertical Alignment of Liquid Crystal by Ion Beam Irradiation)

  • 강동훈;김병용;김영환;옥철호;한정민;김종환;이상극;서대식
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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    • pp.414-414
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    • 2007
  • In this study, Liquid Crystal (LC) alignment and tilt angle generation in Nematic Liquid Crystal (NLC) with negative dielectric anisotropy on the homeotropic PI surface with new ion beam exposure are reported. Also. high density of ion beam energy (DuoPIGatron type Ar ion gun) is used in this study. The tilt angle of NLC on the homeotropic Polyimide (PI) surface for all incident angles is measured about 38 degree and this has a stabilization trend. And the good LC alignment of NLC on the PI surface with ion beam exposure of $45^{\circ}$ incident angle was observed. Also the tilt angle of NLC on the homeotropic PI surface with ion beam exposure of $45^{\circ}$ had a tendency to decrease as ion beam energy density increase. The tilt angle could be controlled from verticality to horizontality. Also, the LC aligning capabilities of NLC on the homeotropic PI surface according to ion beam energy has the goodness in case of more than 1500 eV. Finally. the superior LC alignment thermal stability on the homeotropic PI surface with ion beam exposure can be achieved. For OCB(Optically Compensated Bend) mode driving, we can need pretilt angles control for fast response time. In this study, We success pretilt angles control. Consequently, this result can be applied for OCB mode.

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Liquid Crystal Orientation Properties on Homogeneous Polymer Surface by Various Alignment Methods

  • Kim, Young-Hwan;Lee, Kang-Min;Kim, Byoung-Yong;Oh, Byeong-Yun;Han, Jeong-Min;Seo, Dae-Shik
    • Transactions on Electrical and Electronic Materials
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    • 제10권1호
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    • pp.16-19
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    • 2009
  • We have studied the liquid crystal alignment properties for various alignment methods on the homogeneous polyimide surface. Suitable liquid crystal alignment for one-side alignment cell on the polyimide surface by all alignment method was observed. Highly pre-tilt angle of the NLC for both-side rubbing cell was measured. But, low pre-tilt angle of the NLC for one-side ion beam and UV irradiation cell was observed. We consider that the pre-tilt angle of NLC for one-side ion beam and UV irradiation on the PI surface is lower than that of the PI surface with rubbing. Also, the suitable transmittance-voltage curves for the one-side rubbing TN-LCD on the PI surface with one-side UV irradiation were measured. Also, good response time characteristics of the one-side rubbing TN-LCD on the polyimide surface with one-side UV irradiation can be measured.

Homeotropic Alignment Effect for Nematic Liquid Crystal on the SiOx Thin Film Layer by New Ion Beam Exposure

  • Han, Jeong-Min;Choi, Sung-Ho;Kim, Byoung-Yong;Han, Jin-Woo;Hwang, Jeoung-Yeon;Ok, Chul-Ho;Seo, Dae-Shik
    • Transactions on Electrical and Electronic Materials
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    • 제7권6호
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    • pp.293-296
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    • 2006
  • We studied homeotropic alignment effect for a nematic liquid crystal (NLC) on the $SiO_{x}$ thin film irradiated by the new ion beam method. $SiO_{x}$ thin films were deposited by plasma enhanced chemical vapor deposition (PECVD) and were treated by the DuoPIGatron ion source. A uniform liquid crystal alignment effect was achieved over 2100 eV ion beam energy. Tilt angle were about $90^{\circ}$ and were not affected by various ion beam energy.

새로운 이온빔을 이용한 $SiO_x$ 박막 표면의 액정 배향 효과 (Homeotropic Alignment Effect for Nematic Liquid Crystal on the $SiO_x$ Thin Film Layer by New Ion beam Exposure)

  • 최성호;김병용;한진우;오용철;서대식
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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    • pp.311-312
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    • 2006
  • We studied homeotropic alignment effect for a nematic liquid crystal (NLC) on the $SiO_x$, thin film irradiated by the new ion beam method $SiO_x$ thin films were deposited by plasma enhanced chemical vapor deposition (PECVD) and were treated by the DuoPIGatron ion source. A uniform liquid crystal alignment effect was achieved over 2100 eV ion beam energy. Tilt angle were about $90^{\circ}$ and were not affected by various ion beam energy.

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양방향 지향성을 갖는 이중 대역 전기적 빔 틸팅 배열 안테나 설계 (Design of the Dual-Band Electrical Beam Tilting Array Antenna with Bi-Directional Directivity)

  • 전후동;허수영;고지환
    • 한국전자파학회논문지
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    • 제27권7호
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    • pp.612-619
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    • 2016
  • 본 논문에서는 양방향성 지향성을 갖는 이중 대역 전기적 빔 틸팅 배열 안테나를 설계하였다. 복사소자는 이중 공진이 일어나도록 하고, PCB 기판을 이용한 평면 다이폴로 설계하였다. 각 주 빔을 틸팅하기 위하여 위상 지연기는 광대역으로 동작하여야 하므로 $50\Omega$ 마이크로스트립 선로를 이용한 위상만 변화되도록 설계하였다. 설계 안테나는 $0^{\circ}{\sim}{\pm}8^{\circ}$의 틸팅 각도를 갖는다. 안테나의 설계 규격을 검증하기 위해 배열 안테나를 제작하고 성능을 측정하였으며, 계산결과와 비교적 양호한 결과를 얻었다.

이온빔 스퍼터링으로 증착한 IZTO 박막의 결정화 거동과 전기적 특성 분석 (Crystallization Behavior and Electrical Properties of IZTO Thin Films Fabricated by Ion-Beam Sputtering)

  • 박지운;박양규;이희영
    • 한국전기전자재료학회논문지
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    • 제34권2호
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    • pp.99-104
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    • 2021
  • Ion-beam sputtering (IBS) was used to deposit semiconducting IZTO (indium zinc tin oxide) thin films onto heavily-doped Si substrates using a sintered ceramic target with the nominal composition In0.4Zn0.5Sn0.1O1.5, which could work as a channel layer for oxide TFT (oxide thin film transistor) devices. The crystallization behavior and electrical properties were examined for the films in terms of deposition parameters, i.e. target tilt angle and substrate temperature during deposition. The thickness uniformity of the films were examined using a stylus profilometer. The observed difference in electrical properties was not related to the degree of crystallization but to the deposition temperature which affected charge carrier concentration (n), electrical resistivity (ρ), sheet resistance (Rs), and Hall mobility (μH) values of the films.