• Title, Summary, Keyword: Notch Filter

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Design of a 170 GHz Notch Filter for the KSTAR ECE Imaging Sensor Application

  • Mohyuddin, Wahab;Woo, Dong Sik;Kim, Sung Kyun;Kim, Kang Wook;Choi, Hyun-Chul
    • Journal of Sensor Science and Technology
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    • v.25 no.1
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    • pp.8-12
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    • 2016
  • A planar, light-weight, and low-cost notch filter structure is required for the KSTAR ECEI (Electron Cyclotron Emission Imaging) system to protect the mixer arrays from spurious plasma heating power. Without protection, this heating power can significantly degrade or damage the performance of the mixer array. To protect mixer arrays, a frequency selective surface (FSS) structure is the suitable choice as a notch filter to reject the spurious heating power. The FSS notch filter should be located between the lenses of the ECEI system. This paper presents a 170 GHz FSS notch filter for the KSTAR ECEI sensor application. The design of such an FSS notch filter is based on the single-sided square loop geometry, because that makes it relatively insensitive to the incident angle of incoming wave. The FSS notch filter exhibits high notch rejection with low pass-band insertion loss over a wide range of incident angles. This paper also reviews the simulated and measured results. The proposed FSS notch filter might be implemented in other millimeter-wave plasma devices.

Implementation of Power Line Communication System Appling High-Order Stable Notch filter Scheme (High-Order Stable Notch Filter 기법을 적용한 전력선 통신 시스템 구현)

  • Kim, Kyung-Seok;Nam, Yun-Ho;Kim, Joo-Seok
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.1C
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    • pp.28-36
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    • 2011
  • As Power Line has been already installed over 60% of a residential area all over the world, Broadband Service has been possible using high-speed PLC(Power Line Communication) without new access line installed for Internet access. Because of such reason, PLC is researched as the most suitable service for Last Mile Solution. But, Power Line is designed for transmitting electric power, so peripheral Wireless Communication System is affected by a leak of electric wave. In this paper, we propose a High Performance Notch Filter algorithm in comparison with a existing notch filter for reduction of interference between existing Wireless Communication Service and Power Line Service. In addition, we implement the Notch Filter emulator appling a High Performance Notch Filter and using a embedded board.

Implementation of a High Performance Notch Filter Algorithm for Power Line Communication System (전력선 통신 시스템을 위한 고성능 Notch Filter 알고리즘 구현)

  • Nam, Yun-Ho;Jang, Dong-Won;Kim, Kyung-Seok
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.10 no.3
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    • pp.159-166
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    • 2010
  • As Power Line has been already installed over 60% of a residential area all over the world, Broadband Service has been possible using high-speed PLC(Power Line Communication) without new access line installed for Internet access. Because of such reason, PLC is researched as the most suitable service for Last Mile Solution. But, Power Line is designed for transmitting electric power, so peripheral Wireless Communication System is affected by a leak of electric wave. In this paper, we propose a High Performance Notch Filter algorithm in comparison with a existing notch filter for reduction of interference between existing Wireless Communication Service and Power Line Service. In addition, we implement the Notch Filter emulator appling a High Performance Notch Filter and using a embedded board.

Optimal Design of Notch Filter in Photovoltaic Inverter (태양광 인버터의 노치 필터 최적 설계)

  • Kim, Yong-Rae;Heo, Cheol-Young;Lee, Young-Kwoun;Choy, Ick;Choi, Ju-Yeop
    • Journal of the Korean Solar Energy Society
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    • v.39 no.2
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    • pp.81-92
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    • 2019
  • When Photovoltaic inverter is connected to grid and used as PVPCS (Photovoltaic Power Conditioning System), 120 Hz AC ripple occurs at the dc-link capacitor voltage. This AC ripple reduces the efficiency of PVPCS and shortens the lifetime of the capacitor. In this paper, we design a notch filter to remove AC ripple. As a result, the AC voltage ripple was removed from the dc link and the THD of the PVPCS output current with the notch filter was lowered. This notch filter is determined by the damping coefficient, the bandwidth coefficient, and the switching frequency. Among these, the switching frequency determines the switching loss and the size of the LC filter, and the PVPCS with the high switching frequency has a greater efficiency loss due to the switching loss than the efficiency improvement by the notch filter. Therefore, it is important to set the optimum switching frequency in the PVPCS with the notch filter applied. In this paper, THD and switching loss of PVPCS output current with notch filter are calculated through simulation, and cost function to calculate optimum switching frequency through data is proposed.

Practical Design Issues in a Linear Feedback Control System with a Notch Filter (선형 피드백 제어계의 노치필터 설계에 대한 실제적 문제)

  • Jin, Lihua;Kim, Young-Chol
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.1
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    • pp.176-183
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    • 2010
  • This paper presents some practical design issues that should be carefully considered when a notch filter is included in a linear feedback controller. A notch filter is generally used to compensate the effects of resonant modes that may result in poor performance. It is very common that the practical engineers prefer to add such a notch filter after having previously designed a feedback controller without the filter. It is known that the resulting performance by this approach is not seriously different from when a feedback controller is designed for a plant previously compensated by a notch filter. However, we will point out that there are some cases where both approaches have different performances. In order to show this, a low-order controller design using the partial model matching method has been applied to a linear time invariant (L Tn model. The results suggest that there is a tendency to achieve much better time responses in terms of reducing the overshoot and shortening the settling time, and in the frequency domain characteristics such as the sensitivity function and the stability margins when the design of a feedback controller after including a notch filter is carried out.

A Fast Algorithm for Real-time Adaptive Notch Filtering

  • Kim, Haeng-Gihl
    • Journal of information and communication convergence engineering
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    • v.1 no.4
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    • pp.189-193
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    • 2003
  • A new algorithm is presented for adaptive notch filtering of narrow band or sine signals for embedded among broad band noise. The notch filter is implemented as a constrained infinite impulse response filter with a minimal number of parameters, Based on the recursive prediction error (RPE) method, the algorithm has the advantages of the fast convergence, accurate results and initial estimate of filter coefficient and its covariance is revealed. A convergence criterion is also developed. By using the information of the noise-to-signal power, the algorithm can self-adjust its initial filter coefficient estimate and its covariance to ensure convergence.

Notch Filter Design for Power Line Communication based on OFDM (OFDM 기반 전력선 통신을 위한 Notch Filter 설계)

  • Lee, Hyun-So;Lee, Young-Hwan;Jang, Dong-Won;Kim, Kyung-Seok
    • The Journal of the Korea Contents Association
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    • v.9 no.3
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    • pp.58-71
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    • 2009
  • Today is the Information age which Internet service acts a most important Information Source. So A Power Line Communication has been achieved to offer Internet service for Last-Mile area. And Research is achieved to frequence range from 30MHz to 80MHz for High-speed communication service. But, Power Line is not suitable for communication, so, electric wave is generated from flow of communication information. And the electric wave is interfered with Wireless Communication Service using the same frequence range. In this paper, we calculated a 3 steps and 8 steps dynamic Notch Filter to consider the bandwidth of interference signals based on ETSI standard for reduce of interference between Power Line Communication and Wireless Communication Service. And we applied a Notch Filter and verified the application performance from Spectrum and BER.

The comparison of harmonic detection methods on the Power line (상용(220V/60Hz)전원의 고조파 검출 방식의 비교)

  • Jung Dong-Youl;Hwang Hwan-Young;Park Chong-Yeun
    • Proceedings of the KIPE Conference
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    • pp.883-886
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    • 2004
  • The current harmonic detector consists of the load current detector and the notch filter. It obtains the harmonic current from the output of the load current detector using the Notch filter. The GIC in the notch filter is used instead of inductor to minimize the magnitude and phase characteristics variation caused by using twin-T notch filter and passive elements(inductor).

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Implementation of a Dynamic High-performance Notch Filter applying CIC Filter Scheme (CIC Filter 기법을 적용한 동적 고성능 Notch Filter 구현)

  • Shin, Seong-Kyun;Jeong, Won-Ho;Jang, Dong-Won;Kim, Kyung-Seok
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.11 no.6
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    • pp.1-8
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    • 2011
  • Power Line Communication (PLC: Power Line Communication) to propagate the current power lines are in every household of the existing infrastructure is the most extensive network configuration. In addition, the cost required for network configuration, the advantage of almost zero for the investors and is sufficient to attract the attention of operators. The PLC is supply power to power lines used the voice and data communication technologies put it on KHz ~ tens of hundreds of high-frequency signal MHz. But because uses power lines as existing wireless communications systems will occurs interference. The notch filters of a common way to eliminate the interference are used. In this paper, a dynamic high-performance notch filter applying CIC filter performance was verified through MATLAB and was implemented using a TI's TMS320C6416T DSP board.