
61-16 Medical, Biomedical, and Health
with rectangular active electrode area (width 22.75 mm, height 7 mm) are made on a copper-cladded
(c
opper
la
yer
th
ickness
35 μm) e
xible
FR
4
sh
eet
(2
00
μm th
ickness)
usi
ng
UV li
ght
li
thography
pr
ocess
wi
th
a pr
oper
el
ectrode
ma
sk
(F
igure
61.14
)
. Co
pper
pa
tterns
ma
de
on th
e
FR
4
sh
eet
ar
e
el
ectroplated
by
a Ni la
yer
of 2 μm th
ickness
(F
igure
61.15
)
. Fi
nally,
th
e
pa
tterns
ar
e
el
ectroplated
wi
th
a 2 μm th
ick
go
ld
la
yer
a
nd
t
he
g
old
e
lectrode
a
rray
i
s
o
btained
(
Figure
6
1
.16
a)
.
u
s,
th
e
el
ectrode
pa
tterns
in th
e
go
ld
el
ectrode
ar
ray
(F
igure
61.16
a)
ar
e
co
mposed
of a 2 μm thi
ck
go
ld
la
yer,
2 μm thi
ck
Ni la
yer,