• 제목, 요약, 키워드: Cavity resonator

검색결과 151건 처리시간 0.037초

Triple-Mode Characteristics of Cylindrical Cavity Loading a Cylindrical Dielectric Resonator

  • Lee, Seung-Mo;Kim, Cha-Man;Park, Jong-Chul;Kim, In-Ryeol;Oh, Soon-Soo
    • 한국정보전자통신기술학회논문지
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    • v.9 no.6
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    • pp.630-636
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    • 2016
  • In this paper, a novel triple-mode cavity structure, designed for compactness and operating at 850 MHz, is analyzed. A cylindrical dielectric resonator is loaded into a metallic cylindrical cavity. Previous study has been focused on the analysis of the cylindrical dielectric resonator, but in this paper, the effect of the cylindrical metallic cavity has been analyzed. Enclosing the dielectric resonator inside the metallic cavity increases the resonant frequency of the dielectric resonator; however, this increases the quality factor and introduces the possibility of installing coupling screws. The principle of generation of triple-mode was investigated by parametric analysis. The generated triple-mode is TE011 mode and two orthogonally generated HEM121 modes. By adjusting the radius of the dielectric resonator, the height of the dielectric resonator, or the radius of the cylindrical metallic cavity, three modes could be coincided. However, the height of the metallic cavity keeps three modes separated. The mode characteristics of the proposed cavity are analyzed using a full-wave electromagnetic (EM) simulation. The proposed triple-mode cavity could be developed to triple-mode filter using a coupling screw, and the commercial application for the miniaturized filter below 1 GHz could be expected.

공명 흡음판 위 가이드 그릴의 형상이 공진기 흡입 유동에 미치는 영향 (Effect of the Shape of a Guide Grill Above a Resonance Type Sound Absorbing Panel on Intake Flow into a Resonator)

  • 배현우;성재용;이동훈
    • 한국생산제조학회지
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    • v.25 no.3
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    • pp.182-188
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    • 2016
  • This study investigates cavity flows through a guide grill above a resonator. Vortex distributions and intake flows are simulated for various shapes of the guide grill. The flows are assumed to be compressible, unsteady, and turbulent. Numerical simulations are conducted using a large eddy simulation (LES) model. To analyze the effect of the guide grill shape, three cavity lengths (0.2H, 0.6H, and 1.0H) and cavity angles ($30^{\circ}$, $45^{\circ}$ and $60^{\circ}$) are considered based on resonator height (H). The results show that the vortex generated in the resonator by cavity flow increases with cavity length. Thus, the intake flow is minimum at the smallest cavity length and angle. However, when cavity length is equal to resonator height, the intake flow decreases. The maximum intake flow occurs at a cavity angle $45^{\circ}$ at higher cavity lengths owing to the interaction between the vortex in the resonator and intake flow.

평면회로 기법에 의한 SIW Cavity 공진기를 이용한 X-밴드 발진기 (X-Band Oscillator Using SIW Cavity Resonator Based on Planar Circuit Technique)

  • 이현욱;이일우;남희;이종철
    • 한국ITS학회 논문지
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    • v.7 no.1
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    • pp.68-74
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    • 2008
  • SIW (Substrate Integrated Waveguide) cavity 공진기의 구조는 유전체기판에 다수의 via-hole 을 이용함으로써 나타낼 수 있으며, rectangular waveguide 와 유사한 특성을 갖는다. 그리고 $50-{\Omega}$ 마이크로스트립라인과 SIW cavity 공진기 중앙간의 결합구조를 통하여 대역저지 특성이 나타나도록 하였다. 이러한 특성을 갖는 SIW cavity 공진기를 이용하여 X-band(9.45 GHz) 발진기를 제작하였고, 위상잡음은 100kHz offset에서 -98.1 dBc/Hz 로 측정되었다. SIW cavity 공진기는 높은 QL 값을 갖고, 2차원 구조이기 때문에 저비용에 우수한 위상잡음 특성을 갖는 발진기 설계에 응용할 수 있다.

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Aperture Coupled 원통형 공동 공진기 발진기 (Aperture Coupled Cylindrical Resonator Oscillator)

  • 나인주;이정해
    • 한국전자파학회논문지
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    • v.14 no.2
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    • pp.119-126
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    • 2003
  • 본 논문에서는 위상 잡음을 개선하기 위해 높은 Q(quality factor)를 가지는 원통형 공동 공진기(cylindrical resonator oscillator, CRO)를 이용해서 13.4 GHz 대역의 발진기를 설계 및 제작하였다. 공동 공진기와 발진 회로의 결합은 원형 구멍을 통해 이루어졌다. 동일한 발진회로를 이용해서 측정한 결과 원통형 공동 공진기가 유전체 공진기(dielectric resonator oscillator, DRO)보다 위상 잡음 특성이 우수함을 알 수 있었다. CRO는 중심주파수 13.4015250 GHz에서 출력 전력 +3.92 dBm, 위상 잡음은 100 kHz offset에서 109 dBc/Hz로 측정되었다.

Accurate Measurements of the Unloaded Q of a Dielectric-loaded High-Q $TE_{01{\delta}}$ mode Cavity Resonator with HTS Endplates

  • Kwon, H.J.;Hur, Jung;Lee, Sang-Young
    • Progress in Superconductivity
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    • v.1 no.1
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    • pp.36-41
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    • 1999
  • Methods for mode identification and accurate measurements of the unloaded Q ($Q_0$) of a dielectric-loaded $TE_{01{\delta}}$ mode cavity resonator with HTS endplates are proposed. A resonator with a sapphire rod and $YBa_2Cu_3O_{7-x}$(YBCO) endplates was prepared and its microwave properties were studied at temperatures above 30 K. The $TE_{01{\delta}}$ mode $Q_0$ of the resonator, designed to work as a tunable resonator with variations in the gap distance (s) between the sapphire rod and the top YBCO, was more than 1000000 at s = 0 mm and at 30 K with the resonant frequency of 19.56 GHz. The $TE_{01{\delta}}$ mode $Q_0$ decreases as s increases for s < 2 mm until mode couplings between the $TE_{01{\delta}}$ mode and other modes appeared at s = 2 mm. Significant dependence of the $TE_{01{\delta}}$ mode $Q_0$ on the input and output coupling constants was also observed. Applications of the open-ended $TE_{01{\delta}}$ mode cavity resonator for a tunable resonator with a very high Q as well as a characterization tool for the surface resistance measurements of HTS films are described.

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기포로 채워진 캐비티가 압력 센서의 주파수 응답 특성에 미치는 영향 (Effect of Gas-Filled Cavity Of! Frequency Response of a Pressure Transducer)

  • 강관형;이무열;김영기
    • 한국소음진동공학회:학술대회논문집
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    • pp.785-790
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    • 2000
  • The resonant frequency of a gas-filled cylindrical Helmholtz resonator in a liquid is obtained analytically. The equation of motion of the resonator is derived by using the condition of equilibrium of forces acting on the mass in the neck of the resonator. The reaction force on the upper side of the cylinder due to the acceleration of external fluid and sound radiation is obtained by using the analytical results for the baffled circular-piston problem. From the frequency response function of the resonator, a formula to predict the resonant frequency of the resonator is derived. It is shown that the resonant frequency of the Helmholtz resonator significantly decreases due to the cushioning effect of gas inside the cavity. Therefore, when a pressure transducer is to be installed in a pin-hole type mounting method, much care should be paid to remove the gas from the cavity.

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모형연소실내에서 헬름홀츠 공명기의 기하학적 형상 인자에 따른 음향 감쇠 특성 (Characteristics of Acoustic Damping Induced by Helmholtz Resonators with Various Geometric Factors in a Model Chamber)

  • 최효현;박이선;손채훈
    • 한국추진공학회:학술대회논문집
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    • pp.254-257
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    • 2010
  • 본 연구에서는 로켓엔진 연소기의 음향 불안정 억제를 위해 헬름홀츠 공명기의 음향학적 최적 설계 조건을 해석/실험적으로 연구하였다. 질량-스프링-댐퍼 시스템과의 유사성을 이용한 모델 식의 풀이를 통해 감쇠 성능을 정량화하였다. 헬름홀츠 공명기의 기하학적 형상 인자로 목의 길이와 공동의 크기, 목 및 공동의 직경을 선택하였다. 목의 길이가 짧아지고, 공동의 길이가 길어짐에 따라 흡음성능이 증가하고, 목과 공동의 직경비가 증가함에 따라 흡음성능은 감소하였다.

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마이크로스트립 공진기와 Rutile-loaded Cavity 공진기로 측정한 $YBa_2$$Cu_3$$O-{7-$\delta$}$박막의 마이크로파 표면저항 비교 연구 (A Comparative Study for the Microwave Surface Resistances of $YBa_2$$Cu_3$$O-{7-$\delta$}$ Films Measured with a Microstrip Resonator and a Inutile-loaded Cavity Resonator)

  • O. K. Kwon;H. J. Kwon;Lee, J. H.;Jung Hur;Lee, Sang-Young
    • Progress in Superconductivity
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    • v.2 no.2
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    • pp.86-91
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    • 2001
  • Temperature dependences of the unloaded Q(Q$_{0}$) and the resonant frequency ( $f_{0}$) of YB $a_2$C $u_3$ $O_{7-{\delta}}$ (YBCO) microstrip ring resonators and rutile-loaded cylindrical cavity resonators were measured at low temperatures. Dc magnetron-sputtered YBCO films grown on Ce $O_2$-buffered r-cut sapphire (CbS) substrates were used fur this purpose. The surface resistances ( $R_{s}$) of YBCO films measured by both a microstrip ring resonator and a TE $01\delta$/ mode rutile-loaded cylindrical cavity resonator are compared with each other. It turned out that the values of $R_{s}$ measured by the microstrip resonator technique are comparable to those by the rutile-loaded resonator technique at temperatures lower than ~50 K. However, above 50 K, the $R_{s}$ measured by the microstrip resonator technique appeared higher according to the temperature. Our results show that the current crowding effects near the edge of a microstrip resonator become more significant at temperatures near the critical temperature.emperature.e.e.e.e.e.e.

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고온초전도체와 유전체 삽입 공동 공진기를 이용한 발진기의 위상잡음 개선에 관한 연구 (A Study on the Phase Noise Improvement of Oscillator using Dielectric-rod loaded Cavity Resonators with HIS End-plates)

  • 이원희
    • 한국전기전자재료학회논문지
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    • v.22 no.2
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    • pp.174-177
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    • 2009
  • In this paper, an oscillator using dielectric-rod loaded cavity resonators with HTS(High Temperature Superconductor) end-plates was presented. It was operated at X-band. A two port cavity resonator was incorporated into a basic feedback loop oscillator configuration. A rutile loaded cavity resonator with HTS thin film end-plates was used to provide the quality factor between $10^4$ and $10^6$. A parallel feedback oscillator was constructed with a dielectric loaded cavity resonator, an amplifier, and a directional coupler. At 300 K, the experimental results showed the phase noise of -108 dBc/Hz at a 100 kHz offset frequency. At 26 K, the results was -118.8 dBc/Hz at same offset frequency.