• Title, Summary, Keyword: Insertion Loss

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Fabrication of Multimode Polymeric Waveguides by Hot Embossing Process: Effect of Sidewall Roughness on Insertion Loss

  • Yoon, Keun Byoung
    • Macromolecular Research
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    • v.12 no.5
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    • pp.437-442
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    • 2004
  • We have fabricated a polymeric waveguide by using a hot embossing technique and have investigated its propagation loss. The replication of waveguide channels through the use of a hot embossing technique is of interest as a single-step process that could deliver surface roughnesses far smaller than the wavelength. We have evaluated experimentally that the sidewall roughness has a dominant effect on insertion losses of the multimode polymeric waveguide. The propagation loss of the waveguide decreased dramatically upon decreasing the sidewall roughness of the channel. We have confirmed that the preparation of waveguides having nanometer-scale sidewall roughness and 0.1 dB/cm propagation loss is possible when using the hot embossing technique.

Insertion Loss Characteristics of a Parallel Two-Wire Transmission Line with Equal Line Length Due to a Rectangular Aperture Sizes in Dual Ground Planes (두 개의 접지 평판 사각형 개구의 변화에 따른 평행 2선 전송 선로의 삽입 손실 특성)

  • Jung, Sung-Woo;Lim, Sung-Min;Jin, Jung-Hi;Kim, Ki-Chai
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.7
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    • pp.675-682
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    • 2011
  • This paper presents two ground plane effects due to the size of two rectangular apertures for two-wire transmission line with equal line length crossing the changeable rectangular apertures in infinite ground planes. The CST MWS is used to determine the characteristics of the insertion loss of the transmission line from the load section in accordance with the ground plane aperture size. The results show that the insertion gain and the insertion loss are periodically observed for the multiple frequency of the half wavelength resonance by the wire length when the transmission line is nearby to horizontal side or vertical side of the aperture. The measurements of the insertion loss are performed to verify the theoretical analysis.

Design of 1.9GHz Band Drop-In Type Isolator (1.9GHz Band Drop-In Type Isolator 설계)

  • Kim, Jee-Gyun;Lee, Heon-Yong;Lee, Byong-Hak
    • Proceedings of the KIEE Conference
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    • pp.1536-1538
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    • 2000
  • In this paper, designed and fabricated the 1.9GHz band isolator for wire-less communication base-stations. It was investigated that characteristics of insertion loss and return loss. The characteristic results of dual structure design showed values that insertion loss was about -40dB and return loss was about -23dB at 1.93$\sim$1.99GHz.

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Analysis of Frequency Response Depending on Wire-bonding Length Variation (Wire-bonding의 길이 변화에 따른 주파수별 특성 분석)

  • Gwon, Eun-Jin;Mun, Jong-Won;Ryu, Jong-In;Park, Se-Hoon;Kim, Jun-Chul
    • Proceedings of the IEEK Conference
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    • pp.551-552
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    • 2008
  • This paper presets a results of frequency response in variation of wire bonding length. A gold ball bonding is used as a wire bonding process, and a DPDT(double pole double thru) switch is adapted as a device for test. Wire length is ranged from 442um to 833um and a measured frequency range is from 1 GHz to 6 GHz. Little difference are measured in insertion loss and return loss depending on wire length. Measured S21 and S11 are -0.58 dB and -17.7 dB, respectively. S21 insertion loss is rising up and S11 insertion loss is falling down as the frequency is increased.

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The Effect of Air gap Insertion in Test Acoustic Performance of Sound Barrier using Structural Vibration System (구조 진동 시스템을 이용한 흡차음재 음향 성능 실험시 공기 층 삽입의 효과)

  • Sihn, Jae-Seong;Kang, Yeon-June;Sung, Myung-Ho;Kim, Hyun-Suk
    • Proceedings of the KSME Conference
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    • pp.646-650
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    • 2001
  • In this paper, it is presented that the effect of air gap insertion in testing the transmission loss of sound barrier using structural vibration system. In this study, we use the APAMAT based on the structure-borne-noise. The measured results show that air gap insertion improves transmission loss as results of test based on the air-borne-noise. The measured results are compared with the predicted transmission loss using the transfer matrix method. The predicted results were found to be in reasonable agreement with measured results.

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Empirical Research for the Sound Insertion Loss of Panels (다중 페널의 차음성능에 대한 실험적 연구)

  • Ko, Kang-Ho;Kook, Hyung-Seok;Kim, Young-Ho
    • Proceedings of the KSME Conference
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    • pp.198-203
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    • 2001
  • This paper discusses an experimental method for measuring the insertion loss (IL) performance of a double panel that are used in vehicles. Instead of two adjacent reverberation chambers which are generally used to measure the transmission loss (TL) of the large sound isolation materials, air-borne sound insulation tester was utilized to determine the IL and articulation index (AI) of standardized deadening materials. In comparison to reverberation chamber method, air-borne sound insulation tester method is more space-saving, more time-saving and more simple to the automotive acoustics. From the empirical results, it is verified that the performance of deadening materials is closely connected with thickness of panels, type of filling material that is filled into a double panel, and area ratio of double panel.

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Performance prediction and measurement of the barrier (합성수지 방음벽의 성능예측 및 평가)

  • 박진규;김관주;정환익;김상헌;최상석
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.718-723
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    • 2004
  • The insertion loss of a noise barrier comes from the effects of diffraction, transmission loss, absorption coefficient and attenuation by direct propagation. The noise level after the noise barrier, differs reatly from the diffraction on the upper part of the barrier. Maekawa, furze and Anderson presented a empirical formula for calculating the diffraction of a semi infinte screen shaped noise barrier. In this syudy, Noise reduction performance software was developed for the proper design and assessment of new plastic barrier . Predicted sound pressure level from using the software is compared with the site-measurement results to verify the noise reduction performance and feasibility of prediction software for insertion loss of noise barrier.

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Characteristics of Isolator for material parameter (페라이트 소재변수에 따른 아이솔레이터 특성 연구)

  • Jun, Dong-Suk;Lee, Hong-Yeol;Kim, Dong-Young;Lee, Sang-Seak
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.119-122
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    • 2003
  • This paper describes characteristics for insertion losses of Isolator have an effect on material parameter. One purpose of the paper is to present insertion loss on this resonator for magnetic loss, dielectric loss, magnetic field and saturation magnetization. Another is to study the effect of propeller resonator on response characteristics. In this paper, the analysis and measurement of the response characteristics were carried out for the isolator prototype. The measurement results agreed on the simulation results and acquire insertion loss $0.18\;{\sim}\;0.24dB$, return loss 27dB, isolation 27dB and bandwidth 500MHz on this condition saturation magnetization 550G, dielectric loss 0.0004, magnetic loss 20 and dielectric constant 14.

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Analysis of the Plane-Concave Fabry-Perot cavity for a tunable filter (파장가변 필터를 위한 Plane-Concave Fabry-Perot 공진기의 해석)

  • Yeh YunHae
    • Korean Journal of Optics and Photonics
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    • v.15 no.6
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    • pp.495-502
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    • 2004
  • We proposed an analysis model for a Fabry-Perot cavity constructed with a plane-mirrored optical fiber and a concave-mirrored one. We presented the analysis results calculated by inserting practical values into the equations derived. The coupling loss of the cavity and the mirror loss are the most important parameters in reducing the insertion loss of the filter. In order to build a filter of finesse 600, FSR 57 nm, and insertion loss < 3 dB, the plane-concave cavity using mirrors of loss < 0.09% should be aligned for the coupling loss to be less than 0.1 %.

Evaluation of Y-Cap Capacitance in EMI Filter Design Using Measured S-Parameter (측정된 S-파라메터를 이용한 EMI 필터의 Y-캡 용량 산정에 대한 연구)

  • Kim, Jonghyeon;Jeon, Jiwoon;Kim, Taeho;Kim, Sungjun;Nah, Wansoo
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.3
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    • pp.319-332
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    • 2014
  • Insertion loss is used as the character to express the efficiency of EMI filter. In this paper, we studied the better method that can measure the insertion loss of EMI filter exactly than the original method. For the achievement of this, the method measuring both common mode(CM) and differential mode(DM) insertion loss with arbitrary input/output impedance is accomplished using a 4-ports S-parameters system for consideration of unbalanced factor. Using this method, when input/output used in specific system is known, CM/DM insertion loss of EMI filter inserted in the system can be calculated. Finally, we applied 4-ports modeling method to 'X/Y capacitor part' and suggested the algorithm for selecting suitable the value of Y-capacitor using mixed mode S-parameters and mixed mode chain S-parameters.