Page 208 - Satellite Communications, Fourth Edition

188 Chapter Six

E

Parallel l 0
conducting 2
plates
Ferroelectric lens

Ferroelectric
material
DC bias
l
2

l 0
E
2
Figure 6.37 A ferroelectric lens.
(Courtesy of U. S. Naval Research
Center Laboratory Radar Division,
conducting Washington, DC. Source: http://
Quarter-wave plate radar-www.nrl.navy.mil/Areas/
Ferro)
transformers
Top view of one column

Further details will be found at www.ansoft.com/news/articles/
ICEAA2001.pdf.

6.21 Array Switching
Switching of the phasing elements in the antenna arrays is usually car-
ried out digitally. (There are analog phase shifters, some employing fer-
rite materials, which offer continuously variable phase change, but