Compact circular boxed slot antenna array devoted to polarimetric direction finding

We present a boxed slotline array de- voted to portable direction finding. The structure is presented and the tight links between figures of merit such as radiation efficiency, input reflection coefficient, phase center of the radiation patterns and unit cell area are explicited. We then optimize the design and propose a simulated direction find- ing scenario for maximum radiation efficiency, which shows reasonably good resolution for the target ap- plication

SVD post-compression combined with shielded-block preconditioner

In this paper, we present a post- compression method based on the Singular Value Decomposition that can be used to retrieve the low- rank representation of the Method of Moments in- teraction matrix after using the shielded-block pre- conditioner. Compression ratios of more than 17 has be achieved without significant loss of accuracy and can be further increased at the expense of the precision. The time needed to compress the pre- conditioned matrix is negligible with respect to the preconditioning time