• Title/Summary/Keyword: Waveguide

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Analysis of cross slotted waveguide antenna using Spatial Network Method (공간회로망법을 이용한 크로스 슬롯 도파관 안테나 해석)

  • Park, Kyoung-Su;Choi, Sung-Youl;Kim, Jin;Lee, Hee-Bock;Ko, Young-Ho
    • Proceedings of the IEEK Conference
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    • pp.493-496
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    • 2000
  • This paper presents a slotted leaky waveguide antenna using a rectangular waveguide for mobile reception of DBS (Direct Broadcasting Satellite). A slotted rectangular waveguide in leaky-wave operation can obtain a large beam-tilting angle of 45$^{\circ}$, which is an attractive candidate of mobile DBS receiving antennas because it can be installed horizontally. SNM is used to solve arbitrary shape and materials constant, derived from maxwell's equations. In this paper, analyze cross slot waveguide antenna using SNM. and verify by HFSS.

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GTD Analysis of Electromagnetic Plane Wave Scattering by Open-Ended Parallel Plate Waveguide with a Slanted Terminator Inside (GTD를 이용한 경사진 벽으로 막힌 평행도파관의 전자파 산란 해석)

  • 선영식;명노훈
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.29A no.11
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    • pp.19-24
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    • 1992
  • In this paper, a high frequency method is developed which combines the uniform Geometrical Theory of Diffraction(GTD) and the Aperture Integration(AI) to analyze electromagnetic plane wave scattering by a perfectly-conducting, open-ended, semi-infinite parallel plate waveguide with a uniform layer of absorbing material on its inner wall, and with a slanted planar termination inside. In this method, first, the field of an arbitary point inside the paraller plate waveguide is computed by the GTD. Second, the field scattered into exterior region by the waveguide is found using the equivalent current, which can be obtaind from the aperture field of the waveguide and using the AI. Numerical results based on this GTD method are presented and compared with those based on the mode matching method.

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Microwave Rectangular Waveguide Measurement of the Engine Oil Dielectric Constant (초고주파 구형도파로를 이용한 엔진 오일의 유전율 측정)

  • Kim, Ki-Hoon;Kim, Young-Ju
    • Tribology and Lubricants
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    • v.27 no.3
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    • pp.156-161
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    • 2011
  • The rectangular waveguide technique can be used to measure the complex permittivity of dielectric material of various thickness and cross section. This paper presents the analysis system of engine oil permittivity at which deterioration of engine oil is measured at the X-band(8-12.5 GHz). The middle of the rectangular waveguide has engine oil case and is connected with VNA(Vector Network Analyzer) for the measurement of the transmission$(S_{21})$ and reflection$(S_11)$ and then the permittivity is extracted. The deterioration of engine oil is proved by the comparison with both the extracted data and reference data. As the additional research, This paper suggest that an accurate permittivity is considered by not only the wave guide length but the air gap between oil case and the waveguide.

Improved Coplanar Waveguide-to-Microstrip Right-Angled Transition using an Offset Microstrip Section (Offset Microstrip을 이용한 Coplanar Waveguide-to-Microstrip Right-Angled 전이의 특성 개선)

  • 이맹열;이해영
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.5
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    • pp.445-450
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    • 2002
  • We analyzed and measured a CPW(coplanar waveguide)-to-microstrip right-angled transition. Asymmetric CPW-to-microstrip transitions show significant resonances by the slot mode generation at the discontinuities. The air-bridge just shifting the resonance frequency can not fundamentally suppress the occurrence of the slot mode. So, we proposed the structure using offset microstrip section to eliminate the resonance. The proposed structure may be useful for the application of multi-layed structure.

Analysis of a Tapered Rectangular Waveguide for V to W Millimeter Wavebands

  • Lee, Sangsu;Son, Dongchan;Kwon, Jae-Yong;Park, Yong Bae
    • Journal of electromagnetic engineering and science
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    • v.18 no.4
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    • pp.248-253
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    • 2018
  • An electromagnetic boundary-value problem of a tapered rectangular waveguide is rigorously solved based on eigenfunction expansion and the mode-matching method. Scattering parameters of the tapered rectangular waveguide are represented in a series form and calculated in terms of different rectangular waveguide combinations. Computation is performed to analyze reflection and transmission characteristics. Conductor loss by surface current density is also calculated and discussed.

Optical Waveguide Fabrication using Laser Direct Writing Method (레이저 직접묘화방법을 이용한 광도파로 제작)

  • 김정민;신보성;김재구;장원석
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.12
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    • pp.42-47
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    • 2003
  • The laser direct writing method has some advantages of being maskless, allowing rapid and inexpensive prototyping in comparison to conventional mask-based photolithography. In general, there are two kinds of laser direct writing methods such as the laser ablation method and the laser polymerization method. The laser polymerization method was studied fur manufacturing waveguide in this paper. It is important to reduce line width for image mode waveguides, so some investigations will be carried out in various conditions of process parameters such as laser power, writing speed, focusing height and optical properties of polymer. Experimentally, the optical waveguide was manufactured trapezoid shape. Through SEM the waveguide was 20 ${\mu}{\textrm}{m}$ width and 7.4 ${\mu}{\textrm}{m}$ height.

Vertically Integrated Waveguide Thermo-Optic Switch for Three-Dimensional Optical Interconnection (3차원 광연결용 수직방향 광도파로 열광학 스위치)

  • 김기홍;신상영;최두선
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.111-114
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    • 2002
  • We propose and fabricate a vertically integrated waveguide thermo-optic switch. It controls the optical path between two vertically stacked waveguide. As a first step, we fabricate polymeric waveguides. The measured propagation loss is ranged from 0.3 db/cm to 0.4 dB/cm at the wavelength of 1.55 $\mu\textrm{m}$. We fabricate the proposed vertically integrated waveguide thermo-optic switch to demonstrate its preliminary feasibility. The measured crosstalk is better than -10 db. The power consumption is about 500 mW. Further effort is necessary to improve its performance.

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

  • 이동국;홍재표
    • Journal of the Korea Industrial Information Systems Research
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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 the 60 GHz Band Radial Line Slot Array Antenna Fed by a Rectangular Waveguide (60 GHz 대역용 도파관 급전 Radial Line Slot Array 안테나에 관한 연구)

  • 김용훈;채희덕;이중원;박종국;김성철;김성철
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.3
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    • pp.257-262
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    • 2002
  • A single-layered radial line slot array (SL-RLSA) antenna etched on a substrate and fad by a rectangular waveguide is presented in the 60 ㎓ band. The design curves are obtained by an efficient electromagnetic coupling analysis using Ewald Sum technique and Shanks transformation. The antenna has rectangular waveguide feed structure using a rectangular waveguide-to-radial line transition. The prototype antenna of 10 cm-diameter was tested and the gain of 31 ㏈i and the efficiency of 38% were measured at 60 ㎓.

A new arrayed waveguide grating router with flat passband (평타한 통과대역 특성을 갖는 새로운 구조의 광도파로열 격자 라우터)

  • 김남훈;정영철
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.35D no.3
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    • pp.56-62
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    • 1998
  • One of the key components to accomplish WDM all-optical network is an arrayed waveguide grating router. The spectral characterisitc of the ypeical arrayed waveguide grating rouger has parabolic shape, hence the bandwidth is limited. The spectral response of an optical filter should be as flat as possible for the reliable operation of the syste, because the center frequency of the optical source could be deviated in the actual system. In order to acquire these characteristics, we propose and design a new type of the arrayed waveguide grating router with a flat passband using the Fourier optics concept. The BPM simulation results of the new arrayed waveguide grating router with the flat passband show that the bandwideth is 0.8 nm at -1 dB, instertion loss about 6 dB, and the crosstalk less than -23 dB fro each cnannel, which is 1.6 nm(200 GHz) separated from the adjacent channel around 1550 nm wavelength range.

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