A Frequency Tunable High Sensitivity H-Field Probe Using Varactor Diodes and Parasitic Inductance

Shinde, Satyajeet; Marathe, Shubhankar; Li, Guanghua; Zoughi, R.; Pommerenke, David

doi:10.1109/temc.2015.2508898

Cited by 38 publications

(9 citation statements)

References 9 publications

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“…The sensitivity measures the level of the magnetic field distribution above the device under test. Comparing the achieved sensitivity with the previous results in [ 24 , 25 , 26 , 28 ] shows the main contribution of this work. The proposed probe has summed up the benefits of a large bandwidth with high sensitivity compared to the probes described in the literature reviewed, as illustrated in Table 3 .…”

Section: Isolation and Sensitivitysupporting

confidence: 69%

“…The electromagnetic interference at multiple frequency bands can be estimated using low-sensitivity broadband probes or multi-narrowband high-sensitivity magnetic probes. A tunable resonance magnetic probe was designed, fabricated, and investigated in [ 28 ]. This probe used a varactor diode to switch the frequency bands among the GSM900, UMTS, and GPS applications to improve the sensitivity by 7–9 dB compared to the sensitivity results of a broadband magnetic probe of equivalent size.…”

Section: Introductionmentioning

confidence: 99%

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Switchable Broadband-to-Tunable Narrowband Magnetic Probe for Near-Field Measurements

Abdulhameed

Kubík

2022

Sensors

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This paper presents a printed magnetic probe that can switch from broadband to tunable narrowband for near-field measurement. In the early design stage, we created a printed loop gap resonator as a magnetic reference sensor for the pre-compliance test in a band up to 6 GHz. Consequently, the results showed a good response in terms of the S11 and S21 parameters of the proposed probe compared with the commercial magnetic sensor XF-R 3-1. The source noise might spread among different frequency bands, making the broadband magnetic probe the closest choice for estimating the magnetic field in the near-field region. Unfortunately, broadband magnetic probes have lower sensitivity than narrowband ones. One of the solutions to get high sensitivity is to connect the LNA to the output of the passive magnetic sensor. This work proposes a novel method to solve this issue using a PIN diode to change the broadband status into a high sensitivity narrowband status and then tune this narrowband across the most critical applications such as 3.5° GHz, 3.75° GHz, 4.8° GHz, and 5.2° GHz with the help of a varactor diode. Compared to the broadband status, an improvement of more than 10 dB has been obtained across all these wireless bands. Furthermore, the proposed structure’s isolation between the electrical and magnetic fields is about 13 dB.

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Section: Isolation and Sensitivitysupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Switchable Broadband-to-Tunable Narrowband Magnetic Probe for Near-Field Measurements

Abdulhameed

Kubík

2022

Sensors

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“…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. 12 In addition, the active magnetic probe was proposed for weak signal measurement.…”

Section: Introductionmentioning

confidence: 99%

“…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 . 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 12 .…”

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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“…Sementara itu Kobayashi menggunakan bentuk kupu-kupu (dua loop segi 3) pada probe yang dibuat dengan tujuan dapat mendeteksi noise current yang mengalir di arah yang tak pasti [3]. Kemudian Shinde dkk [4] membuat rectangular probe dan menambahkan varactor diode untuk menyediakan kapasitansi yang dibutuhkan. Zhaowen Yan [5] merancang loop persegi empat sederhana menggunakan 4 layer dan conductor backed coplanar waveguide serta via fence (untuk menekan resonansi frekuensi).…”

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Karakteristik Magnetic Loop Probe Poligonal Sebagai Aplikasi Pengukuran Near Field

Prananto

Wibowo

Wijanarko

et al. 2020

Simet

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Pada pengujian kompatibilitas elektromagnetik khususnya pada pengukuran near field, pengukuran medan magnet sangat diperlukan. Salah satu alat pengukuran yang digunakan adalah magnetic loop probe. Penelitian ini dilakukan untuk membandingkan loop probe pada jumlah sisi geometrinya, dan belum ada referensi yang membahas tentang topik ini. Magnetic loop probe didesain dalam tujuh bentuk geometri yaitu bentuk segi 3 (ada dua model), segi 4, segi 6, segi 8, segi 10, dan segi tak hingga (lingkaran) dimana parameter keliling geometrinya sama. Magnetic loop probe didesain dengan menggunakan perhitungan sebagai small loop antenna Karateristik kelima desain probe dianalisis dengan mengukur S21 sebagai sensitivitas menggunakan Vector Network Analyzer. Karateristik bentuk probe maupun gain dan sensitivitasnya dibahas dalam makalah ini.

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A Frequency Tunable High Sensitivity H-Field Probe Using Varactor Diodes and Parasitic Inductance

Cited by 38 publications

References 9 publications

Switchable Broadband-to-Tunable Narrowband Magnetic Probe for Near-Field Measurements

Switchable Broadband-to-Tunable Narrowband Magnetic Probe for Near-Field Measurements

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

Karakteristik Magnetic Loop Probe Poligonal Sebagai Aplikasi Pengukuran Near Field

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