Copyright © 2006 IEEE
Reprinted from
IEEE microwave and wireless components letters 16 (2006), S. 678 - 680
This material is posted here with permission of the IEEE. Such permission
of the IEEE does not in any way imply IEEE endorsement of any of Universität Ulm's
products or services. Internal or personal use of this material is
permitted. However, permission to reprint/republish this material for
advertising or promotional purposes or for creating new collective works
for resale or redistribution must be obtained from the IEEE by writing to
pubs-permissions@ieee.org .
By choosing to view this document, you agree to all provisions of the
copyright laws protecting it.