<s>
A	O
spatial	B-Algorithm
power	I-Algorithm
combiner	I-Algorithm
generally	O
refers	O
to	O
a	O
microwave	O
system	O
in	O
which	O
the	O
output	O
power	O
of	O
several	O
solid	O
state	O
circuits	O
are	O
combined	O
in	O
free	O
space	O
as	O
opposed	O
to	O
in	O
a	O
lossy	O
substrate	O
.	O
</s>
<s>
Many	O
spatial	B-Algorithm
power	I-Algorithm
combiners	I-Algorithm
use	O
concepts	O
from	O
free-space	O
optics	B-Algorithm
in	O
which	O
dielectric	O
lenses	O
are	O
used	O
to	O
focus	O
a	O
microwave	O
beam	O
into	O
and	O
out	O
of	O
a	O
solid-state	O
circuit	O
array	O
.	O
</s>
