• Title/Summary/Keyword: Dielectric loaded

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

  • Lee, Won-Hui
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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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.

An Approach to Estimate Dielectric Constant of Low-Loss Materials Using Dielectric Slab Loaded Cylindrical Cavity Resonators (유전체 슬랩이 삽입된 원통형 공진기를 이용한 저손실 물질의 유전 상수 측정)

  • Lee, Won-Hui
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.10
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    • pp.1115-1121
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    • 2008
  • In this paper, dielectric slab loaded cylindrical cavity resonator measurement technique is presented to determine the dielectric constant of a dielectric material. The dielectric constant is measured by the resonant frequency deviation of empty and dielectric slab loaded cavity. Characteristic equations are derived by th exact field analysis. The measurement configurations are formed using HP8719A vector network analyzer and an experimental cylindrical metallic cavity with circular cross-section. The validity of the theory is confirmed by experiments and CST MWS 4.0(3D simulator). The results were in the whole satisfactory. The measured dielectric constant of teflon and bakelite are 2.03 and 4.44, respectively.

Analysis of Dielectric-Loaded Surface Plasmon Polariton Waveguides at Telecommunication Wavelengths (광통신 대역에서의 유전체 직각 릿지 표면 플라즈몬 도파로 해석)

  • Jung, Jae-Hoon
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.47 no.11
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    • pp.43-48
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    • 2010
  • The main features of a dielectric-loaded surface plasmon polariton waveguide are analyzed such as mode effective index and propagation length. These parameters are calculated using the finite element method for different metal-polymer pairs while varying the ridge width and thickness. As a performance metric, we employ the 2D figure of merit including two conflicting parameters i.e. mode effective index and propagation length. The results obtained here allow one to identify the parameter range for realizing the dielectric-loaded surface plasmon polariton waveguide and to choose dimension and material of the ridge for subwavelength confinement and moderate propagation loss at telecom wavelengths.

Complex Dielectric Constant Measurements for Conductor-Loaded Composite Materials Using Genetic Algorithms (유전알고리듬을 이용한 도체 입자가 함유된 복합물질의 복수유전율 측정)

  • Lee, Sang-Il
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.2C
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    • pp.10-15
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    • 2005
  • In this paper, a simple but fast and reliable technique for the complex dielectric constant measurement of non-magnetic materials is introduced using a measured transmission coefficient (S21) and a genetic algorithm as an inversion process at microwave frequencies. In this experiment, it has been found that the transmission method is less susceptible with the measurement errors than that of the reflection method and the genetic algorithm can be efficiently used as a search technique. The suggested technique is validated with known and unknown conductor-loaded lossy materials and the conductor-loaded PCB at X-band.

Design of Inductive Loaded Microstrip Patch Antennas with Suppressed Radiations along Horizontal Directions (수평방향 방사가 억제된 Inductive loaded 마이크로스트립 패치 안테나의 설계)

  • Yoon, Young-Min;Kwak, Eun-Hyuk;Kim, Boo-Gyoun
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.49 no.2
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    • pp.56-66
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    • 2012
  • The inductive loaded patch antenna with suppressed radiation along the horizontal plane and enhanced broadside gain is investigated by adjusting the width and the via radius of a unit cell at a fixed length of a unit cell. The effects of the via radius and the width of the unit cell on the dispersion characteristics of the inductive loaded transmission line are investigated. The systematic study to determine the via radius and the width of the unit cell for the effective dielectric constant of the inductive loaded patch antenna close to 1 in order to suppress the radiation along the horizontal plane is presented. Inductive loaded patch antennas composed of five unit cells with resonant frequency of 5 GHz are designed and their radiation characteristics are presented. The horizontal radiation along the E-plane is greatly suppressed to less than -15 dBi when the effective dielectric constant of the inductive loaded patch antenna is slightly less than 1.

TM scattering by an Elliptic Dielectric Cylinder Loaded Slot

  • Byun, W.J.;Myung, N.H.
    • Proceedings of the IEEK Conference
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    • 2000.07b
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    • pp.1072-1075
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    • 2000
  • Analytic series solution for the problem of transverse magnetic (TM) scattering by an elliptic dielectric cylinder loaded slot is presented for an electric line source illumination. The solution is based on using matching functions and mode matching technique (MMT) and it converges very fast.

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Optimal Design of Dielectric-loaded Surface Plasmon Polariton Waveguide with Genetic Algorithm

  • Jung, Jae-Hoon
    • Journal of the Optical Society of Korea
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    • v.14 no.3
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    • pp.277-281
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    • 2010
  • We propose a design and optimization method for a dielectric-loaded surface plasmon polariton waveguide using a genetic algorithm. This structure consists of a polymer ridge on top of two layers of substrate and gold film. The thickness, width and refractive index of the ridge are designed to optimize the figures of merit including mode confinement and propagation length. The modal analysis combined with the effective index method shows that the designed waveguide exhibits a fundamental propagation mode with high mode confinement while ensuring that the propagation loss remains relatively low.

A Resonant Mode Identification in Cylindrical Cavity Resonators with Concentric-rod using Non-decaying Mode Analysis (유전체 봉이 삽입된 원통형 공동 공진기에서의 non-decaying 모드 해석을 이용한 공진 모드 구분)

  • Lee, Won-Hui;Kim, Tai-Shin;Kang, Min-Woo;Koo, Kyung-Wan;Hur, Jung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.1069-1072
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    • 2001
  • We described a method resonant mode identification in dielectric-rod loaded cylindrical cavity resonators. Resonant frequency of dielectric loaded cavity is calculated by analyzing the characteristic equation. The characteristic equation is solved by using the ContourPlot graph of Mathematica. As the result of comparing calculation value and experimental value of resonant frequencies, we know that the field representation of non-decaying mode is exact. The contour graph method is not a method using approximated representation of electromagnetic field variation at the outer area of dielectric in the resonators but a method using exact representation.

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A Study on the Resonant Mode Identification in the Dielectric-disc Loaded Cylindrical Cavity Resonatorsv (유전체 디스크가 삽입된 원통형 공동 공진기에서의 공진 모드 구분에 관한 연구)

  • 이원희;김태신
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.15 no.1
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    • pp.37-45
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    • 2002
  • We described a method of resonant mode identification in dielectric-disc loaded cylindrical cavity resonators. The characteristic equations are solved using the ContourPlot graph of Mathematica. Contour graph method uses graphical method. It is comparable with numerical method. The numerical method is very difficult mode identification. The analysis is based on the approximated electromagnetic representation which is only concentrated on the calculation of resonant frequencies, and a mode identification of resonant frequencies has not been covered. However, It is possible to calculate precise resonant frequencies and to identify the mode of resonant frequencies using the contour graph method. The contour graph method is not a method using approximated representation of electromagnetic field variation at the outer area of dielectric in the resonators. It is a method using enact representation.

Application of Dielectric-loaded Cavity Resonators with HTS Endplates for Tunable High-Q Resonators and Characterization Tools for Large HTS Films (고온초전도 박막이 설치된 유전체부하 공진기의 주파수 조절 가능한 High-Q 공진기 제작 및 대면적 고온초전도 박막의 특성평가에의 응용)

  • Kwon, Hyeong-Jun;Park, Jong-Un;Kang, Hun;Hur, Jung;Lee, Sang-Young
    • 한국초전도학회:학술대회논문집
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    • v.9
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    • pp.75-82
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    • 1999
  • TE$_{01\;{\delta}}$ mode Cavity Resonators with a low loss dielectric rod and YBa$_2Cu_3O_{7-{\delta}}$ (YBCO) endplates were prepared and their microwave properties were studied at temperatures above 30 K. Both sapphire and rutile were used as the dielectrics. 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 dielectric rod and the top YBCO, was more than 1000000 at s = 0 mm and at 30 K and .the resonant frequency of 19.56GHz when a sapphire rod was used for the dielectric. The TE$_2Cu_3O_{7-{\delta}}$ mode resonant frequency (f$_0$) appeared to decrease as the temperature is raised. Meanwhile, the temperature dependence of the TE$_2Cu_3O_{7-{\delta}}$ mode f$_0$ of the rutile-loaded resonator appeared different with f$_0$ increasing according to the temperature and Q$_0$ more than 300000 at 30 K and f$_0$ = 8.56 CHz. Comparisons were made between the microwave properties of the sapphire-loaded and the rutile-loaded resonators. Also, applications of the TE$_2Cu_3O_{7-{\delta}}$ mode cavity resonator for a tunable resonator with a very high Q$_0$ as · well as a characterization tool for surface resistance measurements of HTS films are described.

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