Electric field coupling suppression using via fences for magnetic near-field shielded-loop coil probes in low temperature co-fired ceramics

Chou, Yien-Tien; Lu, Hsin-Chia

doi:10.1109/isemc.2011.6038275

Cited by 16 publications

(9 citation statements)

References 4 publications

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“…A lead section is located between the loop and the following flip-chip bonding transition area. Similar structure was presented in [16]. The diameter of via is 75 m. The distance between the centers of two metal layers is 52 m and the thickness of the metal conductor is 13 m. At 3 GHz, the LTCC substrate has a relative permittivity and loss tangent of 7.5 and 0.005, respectively.…”

Section: B Probe Structurementioning

confidence: 87%

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: B Probe Structurementioning

confidence: 87%

Space Difference Magnetic Near-Field Probe With Spatial Resolution Improvement

Chou

2013

IEEE Trans. Microwave Theory Techn.

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“…Besides, those based on stripline have higher EFSR than CPW because stripline has two layers of ground, which can shield electric-field noise. 10 In addition, lots of methods to improve probe performance were proposed. [11][12][13][14][15][16][17][18] In order to improve sensitivity, the adjustable resonant probe was made using a variable capacitor 11 and ferrite sheets were introduced to enhance electromagnetic induction.…”

Section: Introductionmentioning

confidence: 99%

“…Those based on stripline and CPW usually have higher spatial resolution than those based on coaxial line 6‐9 due to the smaller size. Besides, those based on stripline have higher EFSR than CPW because stripline has two layers of ground, which can shield electric‐field noise 10 . In addition, lots of methods to improve probe performance were proposed 11‐18 .…”

Section: Introductionmentioning

confidence: 99%

A pair of parallel differentialmagnetic‐fieldprobes with high measurement accuracy and highelectric‐fieldsuppression ratio

Liu

Peng

et al. 2020

Int J RF Microw Comput Aided Eng

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Magnetic-field probes can be used for electromagnetic interference measurement of high-speed circuits. The main magnetic probe performance includes sensitivity, spatial resolution, electric-field suppression ratio (EFSR), and measurement accuracy. In this article, a pair of differential magnetic-field probes is proposed to improve measurement accuracy without reducing sensitivity. The proposed differential probes consist of two asymmetric loop probes, which are designed in the same plane and separated by a row of periodic vias. The proposed differential probes are fabricated under PCB process. High accuracy can be achieved by measuring difference between outputs of the two probes. In addition, EFSR can be improved by size optimization of the differential magnetic-field probes. Simulation and measurement results show the operating bandwidth is from 100 MHz to 12 GHz, the measurement error is 3.4% and the EFSR is about 40 dB. The proposed probes have higher measurement accuracy and higher EFSR than the conventional single probe, and larger operation bandwidth than the stacked differential probes.

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“…The disadvantage is that this type of probe cannot isolate unwanted electric field coupling . In contrast, the magnetic probes with electric shielding offer better suppression of unwanted electric field and provide a better spatial resolution when they are fabricated with multilayer thick film on silicon and glass substrates, thin film on a glass substrate and multilayer low‐temperature co‐fired ceramics . The thick film and thin‐film sensors on the glass are fragile and can easily be damaged during the measurement while providing a major advantage in less side electric field coupling .…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, the magnetic probes with electric shielding offer better suppression of unwanted electric field and provide a better spatial resolution when they are fabricated with multilayer thick film on silicon and glass substrates, thin film on a glass substrate and multilayer low‐temperature co‐fired ceramics . The thick film and thin‐film sensors on the glass are fragile and can easily be damaged during the measurement while providing a major advantage in less side electric field coupling . Fabricating the shielded probe on LTCC is simpler and the probe is more robust, but its spatial resolution is larger than that of the probes made by the thin‐film technic.…”

Section: Introductionmentioning

confidence: 99%

Design of a low‐cost 1‐20 GHz magnetic near‐field probe with FR‐4 printed circuit board

Namahoot

Akkaraekthalin

Chalermwisutkul

2019

Int J RF Microw Comput Aided Eng

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An ultra‐wideband magnetic near‐field probe based on a conventional low‐cost four layers of FR‐4 printed circuit board is proposed in this article. It can be used to measure the magnetic near‐field strength from RF magnetic sources or electronic devices for EMI conformance test. The operating frequency of the probe is from 1 GHz up to 20 GHz. The probe is constructed based on a coplanar waveguide and stripline with a short‐end loop. The probe dimension is 10 mm × 25 mm × 0.6 mm. The prototype probe is electric field‐shield structure and has a very high unwanted electric field suppression ratio about 17.7 dB. The probe calibration factor from the simulation agrees well with the calibration factor computed from the measurement. The average probe factor is 38.8 dBS/m and probe sensitivity is 47.4 dB μA/m.

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Electric field coupling suppression using via fences for magnetic near-field shielded-loop coil probes in low temperature co-fired ceramics

Cited by 16 publications

References 4 publications

Space Difference Magnetic Near-Field Probe With Spatial Resolution Improvement

Space Difference Magnetic Near-Field Probe With Spatial Resolution Improvement

A pair of parallel differentialmagnetic‐fieldprobes with high measurement accuracy and highelectric‐fieldsuppression ratio

Design of a low‐cost 1‐20 GHz magnetic near‐field probe with FR‐4 printed circuit board

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