Frequency Diversity Array for Near-Field Focusing

Near-Field Focusing Dielectric Resonator Antenna Array for Fixed RFID Readers

The design of a NF‐ focused DRA phased array antenna is implemented for fixed RFID reader applications at 5.8 GHz. The radiated field is focused in the near‐zone of the array aperture. Numerical investigations on the radiation characteristics of the NF‐ focused array as well as uniform phase array are presented to demonstrate its feasibility for RFID real appl...

Near-field focusing with optical phase antennas.

We investigate the near-field focusing properties of three-dimensional phase antennas consisting of concentric rings designed to have source and image spots separated by several microns from the lens. Tight focal spots are obtained for silicon or gold rings patterned in a silica matrix. We analyze in detail the dependence of the performance of these lenses on geometrical parameters such as the ...

Phased Array Excitations for Efficient Near-field Wireless Power Transmission

Spatial - Temporal Subband Beamforming for Near Field Adaptive Array Processing

This thesis investigates broadband adaptive beamforming for signal targets located in the near field of an array. The primary application of this research is hands-free sound pickup and speech enhancement for wideband telephony. The technical challenges are three-fold. Broadband beamformers are difficult to design due to large frequency dependent beampattern variations and reduced performances ...

Multistatic Array Sampling Scheme for Fast Near-Field Image Reconstruction

A novel multistatic array topology and image reconstruction algorithm for fast 3D near field microwave imaging are presented. Together, the techniques allow for hardware efficient realization of an electrically large aperture and video-rate image reconstruction. The array topology samples the scene on a regular grid of phase centers, using a tiling of Boundary Arrays (BAs). Following a simple c...