Distributed Parameter Analysis of Shielded Loops Used for Wide-Band H-Field Measurements

Lindsay, James; Münter, Klaus

doi:10.1109/tim.1983.4315051

Cited by 3 publications

(4 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mutual inductance between outer and inner loop can be obtained as shown in (5) Where Lm is the mutual inductance between outer loop and inner loop, LI is inductance of the inner loop, LO is inductance of outer loop, and LFSL is inductance of frequency selective loop without low-pass filter (a parallel capacitor). Fig.…”

Section: B Frequency Selective Loop Antnna Designmentioning

confidence: 99%

See 1 more Smart Citation

An Electrically Small Frequency Selective Loop Antenna for Shielding Effectiveness Measurement

et al. 2021

View full text Add to dashboard Cite

This paper proposes an electrically small and frequency selective loop (FSL) antenna for shielding effectiveness (SE) measurement in low frequency (10 kHz-30 MHz) magnetic fields. The proposed antenna consists of an outer loop and an inner loop. A low-pass filter is placed between outer and inner loop to improve the antenna factor (AF) in the upper frequency band as the number of loop turns increases. The size of the designed antenna is 220 mm  220 mm, which achieves 46 % reduction of the antenna area compared to conventional 300 mm loop antennas and the proposed antenna preserves the AF characteristic over the entire frequency range (10 kHz-30 MHz). In addition, the loop of the designed antenna is printed using microstrip techniques, which reduces the cost and complexity of the antenna fabrication. The results demonstrate that the proposed antenna is suitable for SE measurements of small enclosures (all dimensions between 0.75 m and 2 m). INDEX TERMS Electrically small loop antenna, frequency selective antenna, SE measurement small enclosures

show abstract

Section: B Frequency Selective Loop Antnna Designmentioning

confidence: 99%

“…Several loop antennas for SE measurement have been developed [5] [12]. Moebious loop structures [5] [7], loop with a parasitic element [8]− [9], and a shielded conducting surface structures [10]− [12] are reported. However, these antennas are not applicable to the small enclosures due to large volume.…”

Section: Introductionmentioning

confidence: 99%

An Electrically Small Frequency Selective Loop Antenna for Shielding Effectiveness Measurement

et al. 2021

View full text Add to dashboard Cite

show abstract

“…To overcome these issues, there has been a tremendous effort to improve the accuracy of magnetic field measurement. Various loop antennas have been introduced, including a shielded conducting surface [12]- [14], applying two-port excitation [15]- [17], adding a parasitic loop element [18]- [20], and using a Moebius loop structure [21]- [23]. However, such previous studies have generally focused on improving measurement accuracy in the high frequency (HF) band, and an in-depth study on the miniaturization of loop antennas in the VLF band, which can maintain low AF levels, has not yet been carried out.…”

Section: Although These Approaches Have Been Successful In Reducingmentioning

confidence: 99%

Design of a Miniaturized Printed Multi-Turn Loop Antenna for Shielding Effectiveness Measurement

et al. 2020

View full text Add to dashboard Cite

This paper proposes a novel miniaturized loop antenna consisting of a multi-turn printed strip and a ring-shaped ferrite core. The lateral surface of the ferrite core is tightly wrapped by the circular multi-turn strip, which is printed on a thin, ring-shaped Styrofoam. To verify the feasibility, the proposed antenna is fabricated, and the antenna factor (AF) levels are measured using the three-antenna method from the VLF to HF band. The AF levels by measurement, theory, and simulation are 36.14 dB, 34.01 dB, and 33.6 dB at 30 kHz, respectively. In the VLF band, the antenna has a diameter of 114 mm, which is miniaturized to less than 60% compared to previous research. In addition, the proposed antenna is employed in the shielding effectiveness (SE) measurement of a small commercial cabinet to observe its suitability for SE measurement of small shielding enclosures. The SE values averaged over the frequency range from 10 kHz to 3 MHz are 5.19 dB and 14.14 dB in the horizontal and vertical polarizations.

show abstract

“…Shielded loop antennae are widely used for sensing magnetic field [1]- [3]. These antennae can be made in various forms like multi-turn multi-gap [4], [5] and Möbius loops [6]. In 2018, Zhang et al introduced shielded loops into magnetic resonance imaging (MRI), referring to them as "highimpedance coils" [7].…”

Section: Introductionmentioning

confidence: 99%

Condition for Optimal Preamplifier Decoupling in One-turn Single- and Multi-gap Shielded Loop MRI Detectors

Wang

Sánchez‐Heredia

Zhurbenko

et al. 2022

2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)

View full text Add to dashboard Cite

General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

show abstract

Distributed Parameter Analysis of Shielded Loops Used for Wide-Band H-Field Measurements

Cited by 3 publications

References 1 publication

An Electrically Small Frequency Selective Loop Antenna for Shielding Effectiveness Measurement

An Electrically Small Frequency Selective Loop Antenna for Shielding Effectiveness Measurement

Design of a Miniaturized Printed Multi-Turn Loop Antenna for Shielding Effectiveness Measurement

Condition for Optimal Preamplifier Decoupling in One-turn Single- and Multi-gap Shielded Loop MRI Detectors

Contact Info

Product

Resources

About