Magnetic Near-Field Probes With High-Pass and Notch Filters for Electric Field Suppression

Chou, Yien-Tien; Lu, Hsin-Chia

doi:10.1109/tmtt.2013.2258034

Cited by 86 publications

(59 citation statements)

References 17 publications

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“…The measured area are bounded in the dashed rectangle. Each scanning step along the -axis is 200 m and along the -axis is 250 m. Because we don't have a proper double-loaded probe, the high electric field suppression (HEFS) probe type B proposed in [20] is used to substitute the double-loaded reference loop1. The size of the loop aperture of this HEFS probe is identical to that of the reference loop1 shown in Fig.…”

Section: Experiments and Simulation Results Using A Meander Microstmentioning

confidence: 99%

Space Difference Magnetic Near-Field Probe With Spatial Resolution Improvement

Chou

2013

IEEE Trans. Microwave Theory Techn.

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To achieve good spatial resolution, small loop size is required in the traditional loop probe. However, the smaller loop size will lead to lower sensitivity for the probe. In addition, loop size is always limited by the minimum line spacing of the fabrication process. Another problem is that the asymmetric electric field coupling into a probe will not be canceled perfectly even if the structure of this probe is symmetric. To circumvent these problems, a space difference magnetic near-field probe with three kinds of spatial resolutions is proposed in this paper. The probe head including a one-turn loop and a two-turn loop is manufactured in low temperature co-fired ceramics (LTCC). The one-turn loop is clamped with the two-turn loop. Two loops are covered with two shielding ground plates to form a tri-plate structure. The received signals from these two loops are outputted with two SMA connectors through two striplines. The flip-chip junctions with low loss and good shielding capability are used between the probe head and the striplines. The probe characteristics are measured using a 436-m-wide microstrip line with impedance of 50 . Two output ports have different spatial resolutions because two different loops are located above the microstrip line at different height. The proposed probe will have higher spatial resolution when the received signals are outputted in difference. These results are also verified by measuring a 2000-m-wide straight and a 500-m-wide meander microstrip line. The experiment results have good agreement with the simulation results and show the resolution improvement of the difference output of the proposed probe for different lines.Index Terms-Difference output, EMI, magnetic probe, nearfield measurement, spatial resolution improvement.

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Section: Experiments and Simulation Results Using A Meander Microstmentioning

confidence: 99%

Space Difference Magnetic Near-Field Probe With Spatial Resolution Improvement

Chou

2013

IEEE Trans. Microwave Theory Techn.

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“…Ali et al [37] talks about the technology named hybrid integration. Danilovic et al [38], Chou and Lu [39], Xu and Wang [40], Paulis et al [41], Wang and Xu [42], Natarajan and Natarajan [43], Hsiao et al [44], Chen et al [45] discussed new and low cost inverters related to EMI filter design. For easy understanding, the aforementioned published works have been categorized based on switching frequency, power level, hardware implementation, and level of suppression and presented in Table 1.…”

Section: ) Emi Filter Designmentioning

confidence: 99%

A State-of-the-Art Review on Conducted Electromagnetic Interference in Non-Isolated DC to DC Converters

et al. 2020

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One of the most challenging and interesting field in power electronics is the ability to mitigate the Electromagnetic Interference (EMI). A natural source of EMI includes the atmospheric discharge/charge phenomena and extra-terrestrial radiation. Man-made source of EMI are line radiation, auto ignition, radio frequency interference and power lines. Suppression of EMI and enhancing the Electro Magnetic Compatibility (EMC) has become essential in high frequency power electronic converters. This review article is a one stop solution for new researchers and practitioners to understand about the effects of EMI and its suppression techniques in detail. INDEX TERMS Electro magnetic compatibility, electro magnetic interference, mitigation.

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“…A high-pass filter is an electronic filtering device that passes high-frequency signals but attenuates the amplitudes of signals with frequencies lower than a cutoff frequency. (6) Consider the well-known high-pass filter with the operational amplifier shown in Fig. 14.…”

Section: High-pass Filtermentioning

confidence: 99%

New Method of Solving Complicated Operational Amplifier Systems and Application to Online Electrocardiograph

Chen¹,

Chen²,

Li³

2019

Sensors and Materials

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We propose a new systematic matrix approach, which is an alternative to the disordered virtual ground technique, the Kirchhoff's law， and traditional Thevenin approaches, of designing the desired performance and simultaneously finding two Thevenin equivalent parameters for general complicated operational amplifier systems. One cannot apply the virtual ground method to non-ideal and partially ideal operational amplifier systems including instrumentation and frequency sensors. There has been no matrix method for efficiently solving a complicated operational amplifier circuit for conventional tedious approaches that apply Kirchhoff's law. We also propose a new method of finding Thevenin equivalent circuits for general complicated operational amplifier systems that has significant merits over traditional approaches including the open-circuit voltage and short-circuit current methods, the matrix node voltage (mesh current) method, the modified nodal (mesh) analysis, the reference node r model, the reflected impedance method, and the virtual ground method. To compare the proposed and traditional approaches, one demonstrated example and one comparative example are chosen. Moreover, we report a Bessel low-pass filter that is mainly made up of an AD8618 quad op-amp. Its transfer function for existing methods is incorrect in the non-ideal case, and thus the important amplitude-frequency and phase-frequency characteristic curves will not be exact. An online electrocardiograph (ECG) device is an important tool for many industrial medicine applications and is investigated in this study to demonstrate the practical value of the proposed results.

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Magnetic Near-Field Probes With High-Pass and Notch Filters for Electric Field Suppression

Cited by 86 publications

References 17 publications

Space Difference Magnetic Near-Field Probe With Spatial Resolution Improvement

Space Difference Magnetic Near-Field Probe With Spatial Resolution Improvement

A State-of-the-Art Review on Conducted Electromagnetic Interference in Non-Isolated DC to DC Converters

New Method of Solving Complicated Operational Amplifier Systems and Application to Online Electrocardiograph

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