Fig. (5)
(
a
) Symmetrical 3C-HHall. (
b
) Its conformal transformation on the upper half of the
w
' -plane has 2 electrical DoF
k
f
,
R
sh
(
κ
f
is a function of
k
f
). (
c
) Its ERC has only 1 electrical DoF
R
f
.