• 제목/요약/키워드: Low Temperature Co-Fired Ceramic(LTCC)

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CaO-MgO-$SiO_2$ 계 LTCC glass에 대한 특성 연구 (Study on properties of CaO-MgO-$SiO_2$ system glass-ceramic for LTCC)

  • 장명훈;마원철
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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    • pp.322-322
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    • 2008
  • Low-temperature co-fired ceramics (LTCC) have turned out to be very promising technology in accordance with the rapid developments in semiconductor technology. The demands for compact electrical assemblies, smaller power loss as well as high signal density can be fulfilled by LTCC. And for the multi-layered ceramic devices with embedded passive components such as high dielectric constant decoupling capacitor, LTCC materials require the several conditions to avoid delamination and internal cracks. For the present study, diopside-based glass is chosen as the LTCC substrate material in view of its high coefficient of thermal expansion (CTE). From the experimental resultsn the influence of each element on the CTE change can be revealed.

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LTCC 기판의 Particle Size 에 따른 Ag-Pd 전극의 Soldering 특성 변화 (Soldering characteristics of Ag-Pd electrodes in relationship to differing particle size of LTCC substrate)

  • 조현민;유명재;박종철
    • 한국마이크로전자및패키징학회:학술대회논문집
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    • 한국마이크로전자및패키징학회 2002년도 춘계 기술심포지움 논문집
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    • pp.130-133
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    • 2002
  • Solder leaching resistance of the metal electrode is an important factor with regard to adhesion properties of ceramic substrate. In the Low Temperature Co-fired Ceramics (LTCC), Ag-Pd or Ag-Pt pastes are used instead of pure Ag paste to prevent leaching. Solder leaching behavior of the Ag-Pd paste in relation to LTCC raw material powder size was investigated. First fabrication of LTCC green tape with different particle size was done. LTCC substrates with Ag-Pd electrode were prepared using conventional multilayer ceramic process. Dipping test was performed to test solder leaching behavior of the electrode. Ag-Pd electrode on LTCC substrate with smaller particle size achieved higher solder leaching resistance.

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Low k Materials for High Frequency High Integration Modules

  • Na, Yoon-Soo;Lim, Tae-Young;Kim, Jin-Ho;Shin, Hyo-Soon;Hwang, Jong-Hee;Cho, Yong-Soo
    • 한국세라믹학회지
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    • 제46권4호
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    • pp.413-418
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    • 2009
  • Glass systems based on Ca, Sr, Ba, and Zn modified alumino-boro silicates were investigated in order to improve the dielectric and mechanical properties of a typical LTCC (low temperature co-fired ceramic) which was developed for high frequency highly-integrated modules. The glass was prepared by a typical melting procedure and then mixed with cordierite fillers to fabricate glass/ceramic composite-type LTCC materials. The amount of cordierite filler was fixed at 50 volumetric%. For an optimal glass composition of 7.5% CaO, 7.5% BaO, 5% ZnO, 10% $Al_2O_3$, 30% $B_2O_3$, and 40% $SiO_2$ in mole ratio, the resultant LTCC composite showed a dielectric constant of 5.8 and a dielectric loss ($tan{\delta}$) of 0.0009 after firing at $900^{\circ}C$. An average bending strength of 160MPa was obtained for the optimal composition.

LTCC를 이용한 push-push 유전체 공진 발진기의 설계 및 제작 (Design and Fabrication of the Push-push Dielectric Resonator Oscillator using a LTCC)

  • 류근관;오일덕;김성찬
    • 한국정보통신학회논문지
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    • 제14권3호
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    • pp.541-546
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    • 2010
  • LTCC(low temperature co-fired ceramic) 공정의 다층기판을 이용하여 push-push 유전체 공진 발전기를 설계 및 제작하였다. 중심주파수 8GHz를 갖는 직렬 궤환형의 단일 유전체 공진 발진기를 설계하고 이를 이용하여 중심주파수 16GHz인 push-push 유전체 공진 발진기를 설계하였다. 발전기의 회로 크기에 큰 영향을 미치는 바이어스 회로를 LTCC 다층구조의 중간층에 배치함으로써 일반적인 단층기판을 이용한 경우에 비해 발진기 회로의 크기를 크게 줄 일 수 있었다. 제작된 push-push 유전체 공진 발진기의 측정결과 기본 주파수 및 3차 고조파 억압특성은 각각 15dBc 및 25dBc 이상의 특성을 나타내었으며 발진기의 위상잡음 특성은 -102dBc/Hz@100KHz 및 -128dBc/Hz@1MHz의 특성을 각각 나타내었다.

LTCC 공정기술을 이용한 무선랜용 다중대역 칩 안테나 설계 (Design of Multi-band Ceramic Chip Antenna for WLAN using LTCC Technology)

  • 박영호;이용기;이윤도;이상원;천창율
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제53권8호
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    • pp.443-446
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    • 2004
  • In this paper, a multi-band ceramic chip antenna for WLAN(Wireless LAN) applications is designed. The design target is to obtain 0 dBi of coverage gain with omni directional radiation pattern. The antenna is fabricated using Low Temperature Co-fired Ceramic(LTCC) technology. The size of the chip antenna is $2.2{\times}9.65{\times}1.02$mm. The measured antenna gain is 1 dBi at 2.44 GHz and 0.5 dBi at 5.5 GHz. The omni directional radiation pattern for the two operating bands is obtained. The measured bandwidth(S11=-10 dB) are 90 MHz at 2.44 GHz and 1280 MHz at 5.5 GHz respectively

A Low-Loss Patch LTCC 60 GHz BPF Using Double Patch Resonators

  • Lee, Young Chul
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2012년도 추계학술대회
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    • pp.570-572
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    • 2012
  • In this paper, a three-dimensional (3-D) low-loss and wide-band BPF based on low-temperature co-fired ceramic (LTCC) has been presented for mm-wave wireless communication applications. The proposed BPF is designed in a 6-layer LTCC substrate. The double patch resonators are fully integrated into the LTCC dielectrics and vertical via and planar CPW transitions are designed for interconnection between embedded resonators and in/output ports and MMICs, respectively. The designed BPF was fabricated in a 6-layer LTCC dielectric. The fabricated BPF shows a centre frequency (fc) of 53.23 GHz and a 3dB bandwidth of 14.01 % from 49.5 to 56.9 GHz (7.46 GHz). An insertion loss of -1.56 dB at fc and return losses below -10 dB are achieved. Its whole size is $4.7{\times}1.7{\times}0.684mm^3$.

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저온동시소성용 결정화 유리의 필러 사이즈가 열적 특성에 미치는 영향 (Effect of $Al_2O_3$ Particle Size on Thermal Properties of Glass-Ceramics for LTCC Material)

  • 김진호;황성진;이상욱;김형순
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 추계학술대회 논문집
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    • pp.281-281
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    • 2007
  • Low Temperature Co-fired Ceramic (LTCC) technology has been used in electronic device for various functions. LTCC technology is to fire dielectric ceramic and a conductive electrode such as Ag or Cu thick film below the temperature of $900^{\circ}C$ simultaneously. The glass-ceramic has been widely used for LTCC materials due to its low sintering temperature, high mechanical properties and low dielectric constants. To obtain the high strength, addition of filler, the microstructure should have various crystals and low pores in a composite. In this study, two glass frits were mixed with different alumina size(0.5, 2, 3.7um) and sintered at the range of $850{\sim}950^{\circ}C$. The microstructure, crystal phases, thermal and mechanical properties of the composites were investigated using FE-SEM, XRD, TG-DTA, Dilatomer. When the particle size of $Al_2O_3$ filler increased, the starting temperatures for the densification of the sintered bodies, onset point of crystallization, peak crystallization temperature in the glass-ceramic composites decreased gradually. After sintered at $900^{\circ}C$, the glass frits were crystallized as $CaAl_2Si_2O_8\;and\;CaMgSi_2O_6$. The purpose of our study is to understand the relationship between the $Al_2O_3$ particle size and thermal properties in composites.

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Design of T/R Switch Using LTCC Technology

  • Sim, Sung-Hun;Kang, Chong-Yun;Park, Ji-Won;Yoon, Young-Joong;Kim, hyun-Jai;Park, Hyung-Wook;Yoon, Seok-Jin
    • 한국세라믹학회지
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    • 제40권4호
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    • pp.375-379
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    • 2003
  • In this paper, a novel design of multilayer ceramic-based Transmit/Receive (T/R) switch using Low Temperature Co-fired Ceramic (LTCC) technology have been presented. Compact T/R switch has been designed by transforming quarter-wave transmission line to its lumped equivalent circuit. Especially, high-Q three dimensional inductors with double strip have been proposed and incorporated. The proposed inductor has been modeled by multi-conductor coupled lines. A measured inductor quality factor (Q) of 80 and a Self-Resonance Frequency (SRF) of 6.6 GHz have been demonstrated. The inductor library has been incorporated into the design of WCDMA T/R switch.

BaSn(BO3)2세라믹스의 저온소결 및 유전특성 (Low-Temperature Sintering and Dielectric Properties of BaSn(BO3)2 Ceramics)

  • 남명화;김효태;황준철;남중희;여동훈;김종희;남산
    • 한국세라믹학회지
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    • 제43권2호
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    • pp.92-97
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    • 2006
  • Dolomite type $BaSn(BO_3)_2$ ceramics with rhombohedral crystal structure has been synthesized via solid state reaction route. Dielectric properties were measured for the samples sintered at $1050\~1200^{\circ}C$ for 2 h in air. Dielectric constant, loss tangent, and temperature coefficient were increased with sintering temperature due to the evolution of $BaSnO_3$, secondary, phase. Optimum dielectric properties were obtained at the $BaSn(BO_3)_2$ ceramics sintered at $1100^{\circ}C.\;CuO/Bi_2O_3$ was added to $BaSn(BO_3)_2$ ceramics to lower the sintering temperature for LTCC application, then Co and Fe-based coloring agents were added for colorizing the LTCC tape. Typical dielectric properties of $BaSn(BO_3)_2$ ceramics with $5 wt\%\;CuO/Bi_2O_3\;and\;3wt\%$ Co-coloring agent that sintered at $900^{\circ}C$ were $\varepsilon_r=9.89,\;tan{\delta}=0.92\times10^{-3},\;and\;TCC=112ppm/^{\circ}C$. Thus obtained LTCC tape was co-fired with Ag paste for compatibility test and revealed no sign of Ag reaction with the ceramics.

LTCC Helical 인덕터의 Physics-based 모델링 (Physics-based Modeling of Low Temperature Co-fired Ceramic Helical Inductors)

  • 허근;임주환;황성우
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2006년도 하계종합학술대회
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    • pp.601-602
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    • 2006
  • A physics-based equivalent circuit model for LTCC Helical type Inductors is presented. All of the electromagnetic couplings between conductors are included in the model and the number of optimized parameters is minimized. The model can predict the measured results upto 12 GHz.

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