• 제목/요약/키워드: energy-trapped filter

검색결과 8건 처리시간 0.029초

PbTiO3계 세라믹스를 이용한 3차 진동모드 에너지 트랩형 고주파필터의 전기적 특성 (Electrical Characteristics of 3rd Overtone Mode Energy-trapped High Frequency Filter using PbTiO3 System Ceramics)

  • 오동언;류주현;윤현상;박창엽;이수호;김종선;정회승
    • 한국전기전자재료학회논문지
    • /
    • 제16권7호
    • /
    • pp.593-598
    • /
    • 2003
  • In this paper, 3rd overtone mode energy-trapped filter using modified PbTiO$_3$ system ceramics was manufactured to apply for intermediate frequency(IF) SMD type fillet with splitted electrode and gap size. To investigate the effects of splitted electrode and gap size on filter characteristics of 3rd overtone mode energy-trapped filter, ceramic wafers were fabricated by etching splitted rectangular electrode size(b$\times$d) of b=0.4, 0.6, 0.8, 1mm, d=0.3, 0.4, 0.5, 0.6mm and gap size(c) c=0.2, 0.3, 0.4, 0.6mm, respectively. And then, SMD type ceramic filter were fabricated with the size of 3.7$\times$3.1$\textrm{mm}^2$. SMD type ceramic filter with the size of b=0.8mm, d=0.4mm and gap(c)=0.4mm, which showed insertion loss of 2.951dB, 3dB bandwidth of 54.7kHz and 20dB stop bandwidth of 129.27kHz, was suitable for IF bandpass filter application.

$PbTiO_{3}$계 조성 세라믹스를 이용한 3차 진동모드 에너지 트랩형 필터에 관한 연구 ($3^{rd}$ Overtone Mode Energy-Trapped Filter Using $PbTiO_{3}$ System Ceramics)

  • 오동언;류주현;박창엽;윤현상;이수호
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
    • /
    • pp.83-86
    • /
    • 2002
  • In this paper, $3^{rd}$ overtone mode energy-trapped filter using modified $PbTiO_3$ system ceramics was manufactured to apply for intermediate frequency SMD-type filter with the variations of splitted electrode size. To investigate the effects of splitted electrode size on filter characteristics of $3^{rd}$ overtone mode energy-trapped filter, ceramic wafers were fabricated by etching splitted rectangular electrode size($b{\times}d$) of b=0.4, 0.6, 0.8, 1mm, d=0.3, 0.4, 0.5mm, respectively. And then, SMD-type ceramic filter were fabricated with the size of $3.7{\times}3.1mm$. With the variations of b size, insertion loss, 3dB bandwidth and 25dB stop bandwidth showed nearly constant value, but with the variations of d size, insertion loss, 3dB bandwidth, selectivity(shape factor) decreased.⨀؀က?⨀Ⴣ?⨀਀Ⴣ?⨀ꞻꎀ̀ကꮻꎀༀ뮻ꎀ᠀Ȁ햻ꎀĀힻꎀȀ?ꎀ̀?ꎀȀꎀĀꎀĀꎀĀꎀĀꎀЀȀꎀࠀꎀഀڼꎀഀᒼꎀ؀ᮼꎀ䈀ȀȀ悼ꎀऀ檼ꎀഀȀ禼ꎀഀ螼ꎀऀȀȀ鎼ꎀഀȀꊼꎀഀ낼ꎀࠀ즼ꎀԀ쾼ꎀ܀ힼꎀ

  • PDF

압전체 기판에서 에너지 포획된 두께 전단진동의 변위분포 (Particle displacement distributions of energy-trapped thickness shear vibrations in the piezoelectric substrate)

  • 이개명
    • E2M - 전기 전자와 첨단 소재
    • /
    • 제9권9호
    • /
    • pp.954-963
    • /
    • 1996
  • Particle displacement distributions of the fundamental thickness shear vibration mode and overtone modes in an energy-trapped single resonator and an energy-trapped double acoustically coupled filter were calculated. The effects of the width of a pair of partial eletrodes and the magnitude of the plate back of the resonator on the particle displacement distributions of its symmetric vibration mode and anti-symmetric vibration mode were investigated. And the effects of the width of a pair of partial eletrodes, the width of the gap between two pairs of partial electrodes and the magnitude of the plate back of the filter on the particle displacement distributions of its symmetric vibration mode and anti-symmetric vibration mode were investigated.

  • PDF

고차진동을 이용하는 에너지포획형 압전 공진자와 필터의 변위분포에 관한 연구 (A Study on Particle Displacement Distributions of Energy-trapped Piezoelectric Resonators and Filters Utilizing the Harmonic Modes)

  • 이개명
    • 한국전기전자재료학회논문지
    • /
    • 제11권11호
    • /
    • pp.954-962
    • /
    • 1998
  • Energy-trapped thickness vibrations of piezoelectric substrates are utilized in fabricating resonators and filters which have their operating frequencies in HF band. Normalized particle displacement distributions of the fundamental thickness shear vibration mode and overtone modes into the thickness direction in energy-trapped resonators and double-coupled filters were obtained by solving the wave equation and calculating the solved equations. These results show that as the number order of the harmonic mode in a energy-trapped resonator becomes larger, the degree of energy-trapping in the resonator increase, and if the conditions for energy-trapping become sufficiently weak, the energy-trapping effect of the harmonic mode which has the lower order disappears the earlier. Above simulation results were proved by the experiments.

  • PDF

전기히터방식 매연여과장치의 PM 산화 특성에 관한 연구 (A Study on the PM Oxidation Characteristics of Electrical Heater DPF System)

  • 함윤영;김대하;김경운
    • 한국자동차공학회논문집
    • /
    • 제14권1호
    • /
    • pp.183-190
    • /
    • 2006
  • For continuously regenerative PM collecting system which adopted thermally stable SiC DPF and electrical heater which was placed upstream of the filter and driven by well constructed control logic, PM oxidation characteristics were investigated varying air flow rate, amounts of PM accumulated on the DPF and filter inlet temperature in order to get optimized PM regeneration performance. This study showed that the operating condition of air flow rate 70 lpm, high PM loading around 30g and filter inlet temperature $700^{\circ}C$ with heat insulation was effective in achieving high regeneration efficiency. Also, in this condition, we could decrease the electric energy consumption by reducing the regeneration time.

에너지 트래핑 효과를 이용한 이중전극 세라믹 필터의 특성 (The characteristics of two-electrod-ceramic filter using energy trapping effect)

  • 김원석;박기엽;송준태
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1994년도 하계학술대회 논문집 C
    • /
    • pp.1419-1421
    • /
    • 1994
  • The method of suppression based on the principle of energy trapping effect is very effective at high frequency. In this paper, We intended to get resonant frequency and bandpass filer characteristics in appling to vibration mode of PZT-4 and PZT-8 using trapped energy phenomenon. First, we theoretically analyzed a piezoelectric ceramic filter characteristics changing the thickness of ceramic plate, electrode spacing and distance between the two pairs of electrodes. We also experimentally investigated characteristics of ceramic filter made.

  • PDF

압전체 기판에서의 에너지 포획 (Energy Trapping in the piezoelectric Substrate)

  • 이개명;박창엽
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 1995년도 추계학술대회 논문집
    • /
    • pp.34-39
    • /
    • 1995
  • Particle displacement distributions of the fundamental mode and overtone modes in an energy-frapped single resonator and an energy-trapped double acoustically coupled filter using the thickness shear vibration were calculated. And the effects of the width of a pair of partial electrodes, the width of the gap between two pairs of partial electrodes and the magnitude of the plate back on the displacement distributions of the symmetric vibration mode and anti-symmetric vibration mode of the resonators and the filters were investigated.

  • PDF

The corrosion of aluminium alloy and release of intermetallic particles in nuclear reactor emergency core coolant: Implications for clogging of sump strainers

  • Huang, Junlin;Lister, Derek;Uchida, Shunsuke;Liu, Lihui
    • Nuclear Engineering and Technology
    • /
    • 제51권5호
    • /
    • pp.1345-1354
    • /
    • 2019
  • Clogging of sump strainers that filter the recirculation water in containment after a loss-of-coolant accident (LOCA) seriously impedes the continued cooling of nuclear reactor cores. In experiments examining the corrosion of aluminium alloy 6061, a common material in containment equipment, in borated solutions simulating the water chemistry of sump water after a LOCA, we found that Fe-bearing intermetallic particles, which were initially buried in the Al matrix, were progressively exposed as corrosion continued. Their cathodic nature $vis-{\grave{a}}-vis$ the Al matrix provoked continuous trenching around them until they were finally released into the test solution. Such particles released from Al alloy components in a reactor containment after a LOCA will be transported to the sump entrance with the recirculation flow and trapped by the debris bed that typically forms on the strainer surface, potentially aggravating strainer clogging. These Fe-bearing intermetallic particles, many of which had a rod or thin strip-like geometry, were identified to be mainly the cubic phase ${\alpha}_c-Al(Fe,Mn)Si$ with an average size of about $2.15{\mu}m$; 11.5 g of particles with a volume of about $3.2cm^3$ would be released with the dissolution of every 1 kg 6061 aluminium alloy.