• Title, Summary, Keyword: Insertion Loss

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A Low Insertion-Loss, High-Isolation Switch Based on Single Pole Double Throw for 2.4GHz BLE Applications

  • Truong, Thi Kim Nga;Lee, Dong-Soo;Lee, Kang-Yoon
    • IEIE Transactions on Smart Processing and Computing
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    • v.5 no.3
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    • pp.164-168
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    • 2016
  • A low insertion-loss, high-isolation switch based on single pole double throw (SPDT) for a 2.4GHz Bluetooth low-energy transceiver is presented in this paper. In order to increase isolation, the body floating technique is implemented. Based on characteristics whereby the ratio of the sizes of the shunt and the series transistors significantly affect the performance of the switches, the device sizes are optimized. A simple matching network is also designed to enhance the insertion loss. Thus, the SPDT switch has high isolation and low insertion loss without increasing the complexity of the circuit. The proposed SPDT is designed and simulated in a complementary metal-oxide semiconductor 65nm process. The switch has a $530{\mu}m{\times}270{\mu}m$ area and achieves 0.9dB, 1.78dB insertion loss and 40dB, 41dB isolation of transmission, reception modes, respectively.

Reflection-Type 5-bit Digital Phase Shifter with Constant Insertion Loss (균일 삽입 손실 특성을 갖는 반사형의 5-비트 디지털 위상 변위기)

  • 고경석;최익권
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.6
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    • pp.582-589
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    • 2002
  • This paper presents 12.2 GHz ~ 12.7 GHz frequency band reflection type 5-bit digital phase shifter with constant insertion loss property that was fabricated with relatively low cost's InGaAs HEMT for amplifier. The unavoidable large insertion loss difference between on and off states of HEMT, when it is designed by conventional design theory based on ideal switching device, is removed by transforming the HEMT impedances at on and off states to other proper values connecting a certain length transmission line to HEMT and then applying the conventional design theory. The fabricated 5-bit digital phase shifter shows very good insertion loss properties of less than 1.5 dB insertion loss difference and -4.5 dB ~ -6 dB insertion loss in 35 phase steps at 12.2 GHz ~ 12.7 GHz. These results verify the design method presented in this paper, which is useful to design phase shifter of constant insertion loss with non-ideal switching device.

Effect of scratches on optical connector interface surface on the insertion loss (광 커넥터 접합면의 스크래치가 삽입손실에 미치는 영향)

  • 윤영민;윤정현;김부균;신영곤;송국현
    • Korean Journal of Optics and Photonics
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    • v.15 no.4
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    • pp.287-292
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    • 2004
  • This paper presents the effect of scratches on an optical connector interface surface on the insertion loss of optical connectors. We propose a model for calculating the insertion loss of optical connectors. The model is expressed in terms of geometrical parameters of scratches assuming that the transmission coefficient of a light wave on the scratch surfaces is linearly varied as a function of scratch depth. Geometrical parameters of scratches such as location, width, and depth of scratches are measured using 3D optical interferometry surface profiler. We obtain the equation of the transmission coefficient in terms of scratch depth comparing the experimental insertion loss data to the insertion loss data using the model presented in this paper. Using the model and the equation of the transmission coefficient presented in this paper, we present the results of the insertion loss of optical connectors for various geometrical parameters of scratches. Scratches which are located at longer than two times the core radius from the center of the core show negligible effect on the insertion loss of optical connectors.

Effect of Test Board on Insertion Loss of GHz Multilayer LC-Filter (GHz용 적층 LC필터의 삽입손실에 대한 Test Board의 영향)

  • Chun, Myoung-Pyo;Cho, Jung-Ho;Kim, Byung-Ik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.173-175
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    • 2005
  • The effects of PCB Board on the filter characteristics such as insertion loss and transmission characteristics were investigated for the measurement of 5GHz LC filter. Insertion loss measured with PCB Board of Teflon is 0.3 dB lower in comparion with FR-4. The filter characteristics measured in the passband were different from the calculated results. In comparison with the calculated value, the measured value shows that center frequency is 20MHz lower, passband is narrower and insertion loss is larger. The difference of Insertion loss between Teflon and FR-4 increases with increasing measurement frequency.

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Analysis on the Insertion Loss of a Noise Barrier by the Boundary Element Method (경계요소법을 이용한 방음벽의 삽입손실 해석)

  • 이우섭;정성수;황철호
    • Journal of KSNVE
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    • v.10 no.3
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    • pp.423-429
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    • 2000
  • This paper investigates the use of boundary element method(BEM) to analyze the insertion loss of a noise barrier. To begin with the validity of the BEm for the analysis of noise barrier insertion loss in checked by both Lam's theoretical method and the measurements in the anechoic chamber for the scale-down models. Through simulation it is shown that using 2D BEM model is sufficient to the analysis for the barrier with large ratio of length to height. By using 2D BEM model the insertion loses are predicted for the real noise barriers in several cases which are the case that they are built parallel on both roadsides the one that there are multiple sound sources and the one that there is a gap between a concrete structure and a barrier plate.

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Effect of Air Gap Insertion on Transmission Loss of Sound Barrier in APAMAT Measurement (APAMAT을 이용한 실험에서 공기층 삽입이 차음재의 투과 손실에 미치는 영향)

  • 신재성;강연준;성명호;김현석
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1180-1184
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    • 2001
  • This paper presents the effect of air gap insertion on the results in measuring the transmission loss of sound barrier by using APAMAT. The measured results show that air gap insertion improves transmission loss as by two-room method or intensity method. The measured results are compared with the predicted transmission loss using MATLAB GUI program based on the transfer matrix method. Predicted results were found to be in reasonable agreement with measured results.

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Characteristics of Insertion Loss of Transmission Line with Different Line Length Crossing a Rectangular Aperture in a Backplane (백 플레인의 개구를 통과하는 길이가 다른 전송 선로의 삽입 손실 특성)

  • Jung, Sung-Woo;Kim, Ki-Chai
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.2
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    • pp.237-243
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    • 2008
  • This paper presents the backplane effects for two-wire transmission line with different line length crossing the rectangular aperture in an infinite ground backplane. The FDTD method is used to determine the characteristics of the backplane insertion loss and return loss of the transmission line in accordance with the transmission line spacing and additional wire lengths. The results show that the insertion gain is obtained for the narrow spacing of the transmission line and the insertion loss is appeared for the transmission line with the additional wire The measurements of return loss are performed to verify the theoretical analysis.

A simple formula for insertion loss prediction of large acoustical enclosures using statistical energy analysis method

  • Kim, Hyun-Sil;Kim, Jae-Seung;Lee, Seong-Hyun;Seo, Yun-Ho
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.6 no.4
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    • pp.894-903
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    • 2014
  • Insertion loss prediction of large acoustical enclosures using Statistical Energy Analysis (SEA) method is presented. The SEA model consists of three elements: sound field inside the enclosure, vibration energy of the enclosure panel, and sound field outside the enclosure. It is assumed that the space surrounding the enclosure is sufficiently large so that there is no energy flow from the outside to the wall panel or to air cavity inside the enclosure. The comparison of the predicted insertion loss to the measured data for typical large acoustical enclosures shows good agreements. It is found that if the critical frequency of the wall panel falls above the frequency region of interest, insertion loss is dominated by the sound transmission loss of the wall panel and averaged sound absorption coefficient inside the enclosure. However, if the critical frequency of the wall panel falls into the frequency region of interest, acoustic power from the sound radiation by the wall panel must be added to the acoustic power from transmission through the panel.

Analysis of the Sound Insertion Loss of the Enclosure for the Chilled Water Plant in a Ship (선박의 냉수제조기용 인클로우져에 대한 음향 삽입 손실 분석)

  • Han, Hyung-Suk;Jang, Cheon-Ik
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.152-157
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    • 2008
  • Enclosure is widely used for the sound insulation in a ship. But it is very difficult to estimate the sound insertion loss for the enclosure because the sound field between the enclosure and the machine is so complex. Therefore, it is usually estimated experimentally. In this research, sound insertion loss of the enclosure is estimated by theory assuming that the sound field in the enclosure is reverberation field. And the results from the theory are compared to those from the experiment.

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Characteristics of Insertion Loss of Transmission Line with Equal Line Length Due to a Rectangular Aperture Size in a Backplane (백플레인 개구의 크기 변화에 따른 대칭 전송선로의 삽입 손실)

  • Jung, Sung-Woo;Cho, Jun-Ho;Kim, Ki-Chai
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.12
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    • pp.2518-2524
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    • 2009
  • This paper presents the backplane effects due to a rectangular aperture size for two-wire transmission line with equal line length crossing the changeable rectangular aperture in an infinite ground backplane. It is used to determine the characteristics of the backplane insertion loss of the transmission line from the load section in accordance with the backplane aperture size. The results show that the insertion gain and insertion loss are obtained for the specific frequency range when the transmission line is closed to the backplane aperture size. The insertion loss is decreased that the aperture horizontal length and vertical length is more than a=50 mm and b=20 mm. The measurements of insertion loss are performed to verify the theoretical analysis.