Development and Challenges of Near Field Correlation Measurement for Efficient Characterization of Stochastic Electromagnetic Fields
Speaker: Mohd Hafiz Baharuddin
Title: Development and Challenges of Near Field Correlation Measurement for Efficient Characterization of Stochastic Electromagnetic Fields
Abstract: Realistic sources of EM radiation are very complex. The radiated field of a device may be composed of intentional sources i.e. transmitters used for communication with other devices as well as other, unintentional sources of radiation due to the distribution of currents in the device as a result of its normal operation. One approach to deal with the difficulty arising from the complexity of random sources is to use a statistical description of electromagnetic field sources. The analysis of stochastic RF emissions which operate on field-field correlation functions have recently been introduced. The algorithms for propagating the statistical properties of electromagnetic fields are based on Green’s function techniques and a Wigner function approach. In order to validate this propagating algorithm, the George Green Institute of Electromagnetic Research has developed the use of one-probe and two-probe near-field scan for the measurement of field correlation for electronic equipment with many uncorrelated sources that essentially have a stochastic field distribution. The one-probe scan is a frequency-domain measurement while the two-probe scan is a time-domain measurement. The phase/time reference issues and other challenges in performing the measurements will be discussed in this presentation. The data obtained from the measurement will be used to validate the propagation algorithm based on the Wigner Function approach. As the use of two probe scanning is very time consuming and requires large computer resources, we will also look into methods for reducing the complexity of measurement of stochastic fields. In the presentation we will also discuss the possibility of extending the measurement system to a 3-probe measurement in order to efficiently characterize a complex and time dependent system.