Evaluation of wheeler cap antenna efficiency measurement methods using numerical EM simulation data

2008 ◽  
Author(s):  
R.H. Johnston
Keyword(s):  
Measurement Methods ◽  
Efficiency Measurement ◽  
Simulation Data ◽  
Antenna Efficiency ◽  
Em Simulation

scholarly journals A Comparison of Methods to Measure the Coupling Coefficient of Electromagnetic Vibration Energy Harvesters

Micromachines ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 826 ◽  
Author(s):  
Mario Mösch ◽  
Gerhard Fischerauer
Keyword(s):  
Coupling Coefficient ◽  
Energy Harvester ◽  
Electromagnetic Coupling ◽  
Electric Circuit ◽  
Open Circuit ◽  
Measurement Methods ◽  
Vibration Energy ◽  
Simulation Data ◽  
Average Deviation ◽  
Energy Harvesters

Vibration energy harvesters transform environmental vibration energy into usable electrical energy. The transformation is only possible because of a coupling between the mechanical part of the energy harvester and the electric circuit. This paper compares several measurement methods to determine the electromagnetic coupling coefficient. These methods are applied to various implementations of an energy harvester and the results are compared with one another and with simulation data by analyzing the magnetic flux. The average deviation between the measurement methods and the simulation data in our study was 5%. This good agreement validates the methods. Based on this, we recommend determination of the coupling coefficient and the optimum load resistance for maximum power harvesting on the basis of simulations and the open circuit method, because this procedure leads to the shortest measurement times.

scholarly journals Accuracy of railway track conductance and joint efficiency measurement methods

ACTA IMEKO ◽  
2015 ◽  
Vol 4 (4) ◽  
pp. 82 ◽  
Author(s):  
Jacopo Bongiorno ◽  
Andrea Mariscotti
Keyword(s):  
Measurement Methods ◽  
Efficiency Measurement ◽  
Railway Track ◽  
System Parameters ◽  
Joint Efficiency ◽  
Electrified Railways

The IEC 62128-2 (EN 50122-2) indicates methods for the measurement of rail-to-earth conductance and insulating rail joint efficiency in dc electrified railways. These methods are reviewed, considering the influence of system parameters on the accuracy and variability of results. This work reports a characterization and quantification of the uncertainty and limits of validity, as well as some practical considerations on the execution of measurements

Performance Measurement in Social Care: A Comparison of Efficiency Measurement Methods

2006 ◽  
Vol 5 (4) ◽  
pp. 461-477 ◽  
Author(s):  
Paul Clarkson ◽  
David Challis
Keyword(s):  
Performance Measurement ◽  
Social Services ◽  
Cost Efficiency ◽  
Performance Monitoring ◽  
Social Care ◽  
Measurement Methods ◽  
Efficiency Measurement ◽  
Alternative Methods ◽  
Regulatory Regime ◽  
The Uk

Performance measurement in social care is now considerably more advanced than previously. However, measurement is criticised on the basis of its presentation as neutral when, in the UK, it is part of the government's regulatory regime. However, measurement is important, especially when alternative methods may bring about different rankings of authorities to those endorsed by the recent system. This paper explores this issue through analyses of cost efficiency in English social services authorities. It concludes that the picture of authorities' performance depends on the method chosen which, it is argued, should stem from the stated aims of performance monitoring.

Improved Antenna Efficiency Measurement Uncertainty in a Reverberation Chamber at Millimeter-Wave Frequencies

2017 ◽  
Vol 65 (8) ◽  
pp. 4209-4219 ◽  
Author(s):  
Damir Senic ◽  
Dylan F. Williams ◽  
Kate A. Remley ◽  
Chih-Ming Wang ◽  
Christopher L. Holloway ◽  
...  
Keyword(s):  
Measurement Uncertainty ◽  
Millimeter Wave ◽  
Efficiency Measurement ◽  
Reverberation Chamber ◽  
Antenna Efficiency
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