An Approach to Minimizing Probe Array/Target Interactions for Near Field Scattering Measurements
Abstract
We describe an effort to reduce the time required for near field scattering measurements by using an array of near field probes to replace the single probe that is conventionally used. An array of near field probes introduces technical problems. Coupling between the array and the scattering body may introduce errors in the near field measurements by perturbing the plane wave induced currents on the body. Mutual coupling between the probe array elements in the presence of the scattering body may change the near field measured at each probe array element. We analyze these technical problems and describe an approach to compensate for the errors introduced by the use of the probe array. Using an impedance model for the interactions between the probe array and the scattering body, we develop expressions for the measured voltages at each of the transmission line feeds to the probe array elements in terms of (1) the open circuit voltages induced by the plane wave excited body and (2) the in situ mutual impedances of the probe array. The expressions show a linear set of relations to the open circuit voltages.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 13, 2011
- Accession Number
- ADA546288
Entities
People
- John K. Schindler