• Title/Summary/Keyword: Circular Waveguide

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Design of A Dielectric-Slab Polarizer in The Circular Waveguide (유전체판을 이용한 원형 도파관 편파기의 설계)

  • 김영민;안병철
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2000.11a
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    • pp.87-90
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    • 2000
  • In this paper. we present a method for a systematic design of a dielectric slab polarizer in the circular waveguide. This structure is realized using a tapered dielectric slab inside a circular waveguide. Commercial software is used to obtain the equivalent dielectric constant of the circular waveguide partially filled with a dielectric slab. The length of the tapered region is determined so that the reflection from the dielectric slab is sufficiently low. A polarizer operating at 10 GHz band is designed, fabricated and tested.

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Analysis of circular waveguide transformer using FDTD (원형 도파관 정합기의 FDTD에 의한 해석)

  • 이동국;홍재표
    • Journal of Korea Society of Industrial Information Systems
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    • v.8 no.1
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    • pp.9-17
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    • 2003
  • The finite-difference time-domain (FDTD) method is used to analyze circular waveguide transformer in order to match different two waveguides. 2-dimensional cylindrical FDTD algorithm is applied for rotationally symmetric. The transformer is inserted at a circular-to-circular waveguide junction and two type transformers are proposed. One is a partially dielectric filled circular waveguide type and the other is filled a tapered circular dielectric rod. The numerical results are derived for various structure parameters, such as transformer length. dielectric diameter and waveguide diameter.

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A study on a Measurement Method of the Circular-to-Rectangular Waveguide Transition characteristics. (원형-구형 도파관 변환부의 특성 측정 방법 연구)

  • 최병철;신동숙;방재훈;안병철
    • Proceedings of the IEEK Conference
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    • 2002.06a
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    • pp.211-214
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    • 2002
  • In this paper, we present a simple method for characterizing a rectangular waveguide to circular waveguide transition Three standard loads consisting of a short circuit, an offset short circuit 1, and an offset short circuit 2 are sequentially connected to the circular waveguide port and the reflection coefficient at port 1 Is measured for each case. From known reflection coefficients, of standard loads and measured reflection coefficients, the scattering matrix of the transition Is obtained. The proposed method Is verified by the numerical experiment using a commercial software HFSS and by measurments of a actual rectangular-to-circular waveguide transition.

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Analysis and Design of Surface Plasmon Waveguide

  • Kim, Min-Wook;Jung, Jae-Hoon
    • Journal of the Semiconductor & Display Technology
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    • v.8 no.3
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    • pp.7-11
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    • 2009
  • In this paper, we developed and presented a design result for optimizing the geometry of Ag circular SPP waveguide for subwavelength waveguide applications. We investigated the effect of the design parameters on the light propagation and find the optimum design for small modal size, high coupling coefficient, and low sensitivity. The results show that the globally optimal design locates optimal waveguide geometries more efficiently than individual optimal points for multivalued objective function.

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A New Comb Circular Polarizer Suitable for Millimeter-Band Application

  • Eom, Soon-Young;Korchemkin, Y.B.
    • ETRI Journal
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    • v.28 no.5
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    • pp.656-659
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    • 2006
  • This letter presents a new polarizer which has a simple comb structure inside a circular waveguide. The electrical performance of the proposed comb polarizer is optimized by a circular waveguide radius and by the physical parameters of the comb plates. This polarizer is suitable for providing good performance in millimeter-band application because of its simple structure and low fabrication cost. In our experiments the dual-band comb polarizer designed in band 1(K) and band 2(Ka) showed good electrical performance without any tuning elements.

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The Design and Manufacture of Ku-Band Circular Waveguide with Circular Polarizaed Wave Characteristic (원편파 특성을 갖는 Ku-밴드 원형도파관 안테나 설계 및 제작)

  • 이성재
    • Journal of the Korea Institute of Military Science and Technology
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    • v.4 no.1
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    • pp.124-136
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    • 2001
  • In this paper, we designed and manufactured the Ku-band circular waveguide antenna to do wireless communication with a ground radar as on-board antenna of missile. Using the MATLAB and the HFSS, we designed the circular polarizer which has a characteristic of circular polarization and broadband using the capacitive pin method, the feeder to feed coaxial line to circular waveguide, and a stopper to prevent a conductor material from being inserted. Then we simulated the designed antenna using the HFSS, obtained the gain and the radiation pattern. Because of a difficulty of manufacture, we established a manufacture process procedure. Antenna is manufactured with this procedure, test results of the manufactured antenna are the axial ratio of 1.37 ~ 1.72, the 3 ㏈ beamwidth of $72.23^{\circ}{\sim}78.54^{\circ},$ and the gain of 3.26 ~ 4.61 ㏈ within frequency band. We knew that these results are similar with simulation results. Also, we confirmed that the manufactured antenna is satisfied with requirement conditions through performance test, environmental test and flight test.

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Design Equations for the H-plane Power Divider with a Circular Post in a Rectangular Waveguide

  • Han Sang-Sin;Lee Sun-Young;Ko Han-Woong;Park Dong-Hee;Ahn Bierng-Chearl
    • Journal of electromagnetic engineering and science
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    • v.4 no.4
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    • pp.150-155
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    • 2004
  • Universal design equations are presented for the H-plane T-junction power divider with a circular conducting post in a rectangular waveguide. For a given operating frequency and power split ratio, the post offset from the T-junction center line, the distance between the post and the waveguide wall, and the post diameter can be adjusted to obtain a minimum reflection at the input waveguide. Optimum values of the post offset are given in terms of the normalized frequency and the power split ratio. Corresponding values of the post diameter and the distance of the post from the waveguide wall are given in terms of the normalized frequency and the post offset.

Analysis and Design of the Spirally Slotted Array Antenna (나선형 슬랏배열 안테나의 특성해석 및 설계)

  • 민이규;양두영;이상설
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.28A no.10
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    • pp.799-805
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    • 1991
  • In this paper, the analysis and design of a spirally slotted array antenna with high efficiency are presented. Electric fields in the slots are calculated by electromagnetic fields in the upper waveguide and radiation field equations are derived. Slots are arrayed spirally on the upper circular plate of twofold radial waveguide. In order to suppress grating lobes from the array, a slow wave structure is inserted in the upper waveguide. This antenna is characterized by a good circular polarization, high efficiency of 75 percent and grating lobes below -34dB.

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Analysis of waveguide iris using FEM-BIM its application to waveguide filter design (유한 요소 경계 적분법을 이용한 구형 도파관 내 임의의 형상 iris 해석 및 도파관 여파기 설계에의 응용)

  • 박종근;남상욱
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.6
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    • pp.1244-1250
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    • 1997
  • An arbitrary shaped iris in rectangular waveguideis investigated using FEM-CDMA with triangularprism elements in this paper. The volume of irisis subdivided into a relatively small number of triangular prism elements and FEM is used to formulate the field distribution. On the other hand, the fields in the waveguide region are represented by BIM derived from the waveguide Green's function and boundary conditions. The proposed method is verified through the design and experiment for the circular iris filter using WR-90 waveguide.

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A Circularly Polarized Waveguide Narrow-wall Slot Array using a Single Layer Polarization Converter

  • Kim, Dong-Chul;Min, Kyeong-Sik
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.4 no.1
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    • pp.59-65
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    • 2000
  • This paper describes the characteristics of a one dimensional narrow-wall slotted waveguide array with a single-layer linear-to-circular polarization converter consisting of a dipole array. An external boundary value Problem of one slot and three dipoles, which approximates the mutual coupling between the dipole array and an edge slot extending over three faces of a rectangular waveguide, is formulated and analyzed by the method of moments; design of polarization conversion is conducted for this model as a unit element. If every unit element has perfect circular polarization, grating lobes appear in the array pattern due to the alternating slot angle: these are suppressed in this paper by changing the dipole angle and degrading the axial ratio of the unit element. The validity of the design is confirmed by the measurements. The dipole array has negligible effects upon slot impedance; the polarization conversion for existing narrow-wall slotted arrays is realized by add-on dipole array.

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