Abstract
In this paper, a convex-optimization based design method is proposed for the near-field beamformer design problem to improve the performance of an MRI system. The aim is to find the minimum number of antennas required for a uniform circular array, and the array antenna is capable of forming a beam with a pre-defined sidelobe attenuation level for an arbitrary focal point within a given circular scanning area. Two sets of design criteria based on convex optimization are studied: minimizing the maximum response over the sidelobe area and minimizing the mean squared response over the sidelobe area. Design examples have shown that the proposed method can solve the problem successfully.
| Original language | English |
|---|---|
| Pages (from-to) | 18-26 |
| Number of pages | 9 |
| Journal | International Journal of Digital Content Technology and its Applications |
| Volume | 6 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 2012 |
Keywords
- Circular antenna arrays
- Convex optimization
- Near-field
ASJC Scopus subject areas
- Software
- Computer Networks and Communications