• Title, Summary, Keyword: Insertion Loss

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Improvement of Low Pass Filler Using New PBG Structure (새로운 PBG 구조를 이용한 저역통과 여파기 성능 개선에 관한 연구)

  • 이승재;서철헌
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.7A
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    • pp.852-857
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    • 2004
  • In this research, we suggested a new PBG cell with wide stopband. In order to improve the characteristics of the insertion loss, return loss, and ripple, we used two overlapped cells. One is small cell which is made in inside and the other is large cell which is made in outside. The inner cell stops the high band and the outer cell stops the low band. As a result, the new PBG cell had a wide stop band. Insertion loss was about 40dB in stopband and the ripple, and the return loss was improved. Also, the passband is broaden by employing new PBG cells.

Coaxial-type Transient Voltage Suppressor for Antenna Circuit Protection (안테나용 동축형 과도전압 차단장치)

  • 송재용;이종혁;길경석;배정철
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.489-492
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    • 2000
  • This paper describes a new transient voltage suppressor(TVS) with a low insertion loss and a very wide frequency bandwidth to protect antenna circuit from transient voltages. Conventional protection devices have some problems such as low frequency bandwidth and high insertion loss. In order to improve these limitations, a coaxal type TVS, which consists of a gas tube is developed. The performance of the proposed transient voltage suppressor is tested by using a combination surge generator specified in IEC 61000-4-5 standard and by using a network analyzer of 40 MHz ∼ 5GHz bandwidth. From the experimental results, it is confirmed that the proposed TVS has an enough protection performance in low insertion loss and in wide frequency bandwidth

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Design of Interference Type Noise Barrier Using the BEM (경계요소법을 이용한 간섭형 방음벽의 설계)

  • 이상권;이승영
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.11
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    • pp.831-837
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    • 2003
  • This paper investigates the insertion loss of nosie barrier with a interference device, The efficiency of the conventional interference-type noise barrier depends on specific frequency, Thus this study is performed to improve the efficiency of the nosie barrierin the range of broadband frequency. by changing the shape of interference device and adding the channel with various depths, The boundary element method (BEM) is used to predict the insertion loss of noise barrier. Two-dimensional boundary element model is created to simulate the performance of long barrier with a line source.

Fiber-to-fiber Total Insertion Loss가 <6d8인 Ti:LiNbO$_3$ 광도파로 Pigtailing 및 도파모드특성

  • 김성구;윤형도;임영민;윤대원;한상필
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.73-76
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    • 1997
  • A low loss x-cut LiNbO$_3$ optical waveguide was fabricated by Ti in-diffusion and the guided-mode properties and total insertion loss of pigtailing with polarization maintaining fiber(PMF) were investigated and measured at optical wavelength 15507. For formaing the waveguide, the parameters of diffusion Ti thickness, waveguide line-width, length, diffusion temperature, time and atmosphere were set 1400$\AA$, 8${\mu}{\textrm}{m}$, 3.3cm, 105$0^{\circ}C$, 8 hours and wet bubbled oxygen, respectively. and then After the polishing and pigtailing, it showed that total insertion loss was -4.1dB for TM mode, -5.5dB for TE mode, and mode size, that is, horizontal/vertical sizes were 13.87/18${\mu}{\textrm}{m}$ for TM mode, 9.61${\mu}{\textrm}{m}$/6.5${\mu}{\textrm}{m}$ for TE mode.

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Design of Interference Type Noise Barrier Using The BEM (경계요소법을 이용한 간섭형 방음벽의 설계)

  • Lee, Seung-Young;Lee, Sang-Kwon;Cho, Sung-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.749-754
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    • 2002
  • This paper investigates the insertion loss of nosie barrier with a interference device. The efficiency of the conventional interference-type noise barrier depends on specific frequency. Thus this study is performed to improve the efficiency of the nosie barrier in the range of broadband frequency, by changing the shape of interference device and adding the channel with various depths. The boundary element method (BEM) is used to predict the insertion loss of noise barrier. Two-dimensional boundary element model is created to simulate the performance of long barrier with a line source.

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Design of Interference Type Noise Barrier Using The BEM (경계요소법을 미용한 간섭형 방음벽의 설계)

  • Lee, Seung-Young;Lee, Sang-Kwon;Cho, Sung-Hwan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.374.2-374
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    • 2002
  • This paper investigates the insertion loss of nosie barrier with a intereference device. The efficiency of the conventional intereference-type noise barrier depends on specific frequency. Thus this study is performed to improve the efficiency of the rosie barrier in the range of broadband frequency, by changing the shape of intereference device and adding the channel with various depths. The boundary element method (BEM) is used to predict the insertion loss of noise barrier. (omitted)

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Insertion Loss by Noise Barrier on the Discontinuous Ground (불연속 지면위의 방음벽에 의한 삽입손실에 관한 연구)

  • Kim, Ye-Hyun;Kim, Dong-Ill;Jang, Ho-Kyeong
    • The Journal of the Acoustical Society of Korea
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    • v.14 no.3
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    • pp.114-121
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    • 1995
  • Outdoor experimental study is presented the insertion loss caused by barrier considering discontinuous ground condition. Measurements ware made in 1/3 octave band over the frequency range 315 Hz~3150 Hz with the various geometry of the source, receiver and barriers. The frequency range of the interference pattern depends on the phase difference between path from the edge of barrier to receiver, and hence on the acoustical properties of the ground on the receiver side of the barrier. The insertion loss by barrier, in addition to diffraction, is shown to be dependent on the ground characteristic.

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Performance Test and Evaluation of Ship Exhaust Muffler (선박용 소음기 성능 시험 및 평가)

  • Kim, Bong-Ki;Kim, Sang-Ryul;Kim, Hyun-Sil;Shin, Min-Chol
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.12
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    • pp.1237-1242
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    • 2008
  • A muffler design in the exhaust system is critical to provide fur low noise in shipboard spaces. In an attempt to effectively design the low noise muffler, it Is important to evaluate the performance of the muffler considering not only the noise, but also pressure drop as well. For this purpose, a test system of large exhaust mufflers fur ship propulsion systems was designed based on ISO 7235. The substitution test fur determining both the insertion loss and pressure drop of mufflers was carried out. A ship exhaust muffler is considered as a test example and the insertion loss and pressure drop were obtained.

Cross-Coupled Microstrip Combline Bandpass Filter Using Stepped-Impedance Resonators

  • Cho, Young-Ho;Choi, Seung-Un;Yun, Sang-Won
    • Journal of electromagnetic engineering and science
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    • v.7 no.4
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    • pp.190-194
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    • 2007
  • In this paper, a cross-coupled microstrip combline bandpass filter using stepped-impedance resonators(SIRs) is proposed. In order to improve the selectivity as well as the insertion loss, the SIR configuration is used. The cross coupling is also introduced to enhance the selectivity. The improvement of the insertion loss is demonstrated not only by deriving the quality factor of the SIR but through the measured performances. Both the proposed and the conventional combline bandpass filter with 5 % of fractional bandwidth at 2 GHz were fabricated and tested. Compared to the conventional combline bandpass filter, the proposed one exhibits the improved selectivity as well as the lower insertion loss characteristics.

Design and Fabrication of a Coaxial-type Transient Voltage Suppressor for Antenna Protection on Shipboard (선박 통신 안테나용 뇌방호장치의 설계 및 제작)

  • Han, Ju-Seop;Song, Jae-Yong;Kim, Il-Kwon;Kil, Gyung-Suk
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • pp.1166-1169
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    • 2005
  • This paper describes a new transient voltage suppressor(TVS) with a low insertion loss and a high cut-off frequency to protect antenna circuit from transient voltages. Conventional protection devices have some problems such as a low frequency bandwidth and a high insertion loss. In order to improve these limitations, a coaxal type TVS, which consists of a gas tube is developed. The performance of the proposed transient voltage suppressor is tested by using a combination surge generator specified in IEC 61000-4-5 standard and by using a network analyzer of 40 MHz ${\sim}$ 5 GHz bandwidth. From the experimental results, it is confirmed that the proposed TVS has an enough protection performance in a low insertion loss and a high cut-off frequency.

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