scholarly journals Near-field investigation of ions emitted from a hollow cathode assembly operating at low-power

1998 ◽  
Author(s):  
George Williams, Jr. ◽  
Matthew Domonkos ◽  
Karyl Shand ◽  
James Haas ◽  
Lyon Ling ◽  
...  
Keyword(s):  
Low Power ◽  
Hollow Cathode ◽  
Near Field ◽  
Field Investigation ◽  
Cathode Assembly

scholarly journals Coupling plasma plume of a low-power magnetically shielded Hall thruster with a hollow cathode

2020 ◽  
Author(s):  
Guangchuan ZHANG ◽  
Junxue REN ◽  
Wei LIANG ◽  
Ning OUYANG ◽  
Chao LU ◽  
...  
Keyword(s):  
Low Power ◽  
Hollow Cathode ◽  
Plasma Plume ◽  
Hall Thruster

Near‐Field Investigation of a Shaded Transducer

1961 ◽  
Vol 33 (6) ◽  
pp. 836-836
Author(s):  
D. L. Baird ◽  
C. M. McKinney
Keyword(s):  
Near Field ◽  
Field Investigation

An improved low power heater cathode assembly for space-TWT

2010 ◽  
Author(s):  
Shiji Yu ◽  
Mingfeng Meng ◽  
Xiaobao Su ◽  
Huiming Fan ◽  
Yanrong Xin
Keyword(s):  
Low Power ◽  
Cathode Assembly

Near-field investigation of turbulence produced by multi-scale grids

2012 ◽  
Vol 24 (3) ◽  
pp. 035103 ◽  
Author(s):  
P.-Å. Krogstad ◽  
P. A. Davidson
Keyword(s):  
Near Field ◽  
Field Investigation ◽  
Multi Scale

A novel measurement strategy to evaluate the human head as a transition medium for inductive ear-to-ear communication

2019 ◽  
Vol 64 (2) ◽  
pp. 233-241
Author(s):  
Jan-Christoph Edelmann ◽  
Dominik Mair ◽  
Thomas Ussmueller
Keyword(s):  
Low Power ◽  
Hearing Aids ◽  
State Of The Art ◽  
Near Field ◽  
Human Head ◽  
International Telecommunication Union ◽  
International Telecommunication ◽  
Channel Characteristics ◽  
Coupling Factors ◽  
Novel Concept

Abstract This manuscript introduces a novel concept for measuring coil coupling for extremely loose-coupled coils (coupling factors k<10−6; mutual inductance values M<10−10 H). Such a coupling is found everywhere where the ratio of solenoid diameter to coil spacing is >50. Measuring these quantities with a low-power technology requires a sophisticated setup that goes beyond the sensitivity of state-of-the art approaches. The methodology is validated using laboratory measurements with three sets of solenoids (two ferrite-cored, one air-cored) and numerical simulations with COMSOL Multiphysics 5.2a, Stockholm, Sweden. The concept is then employed to investigate the channel characteristics for inductive through-the-head communication within the 3.155–3.195 MHz band. This selected part of the spectrum is in accordance with International Telecommunication Union Radio Regulation 5.116 for low-power wireless hearing aids. By applying a phantom solution, we demonstrate that human tissue layers are transparent for magnetic fields within these frequencies. However, the influence from the relative coil arrangement is evaluated in detail as it restricts the communication range significantly. The coupling results for off-the-shelf Sonion, Roskilde, Denmark, RF 02 AA 10 solenoids considering both lateral and axial displacements might be of special interest for a number of near-field applications.

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