The
closely related split stator variable capacitor does not have
the limitation of 90° angle since it uses two separate packs of
rotor electrodes arranged axially behind one another. Unlike in
a capacitor with several sections, the rotor plates in a split
stator capacitor are mounted on opposite sides of the rotor
axis. While the split stator capacitor benefits from larger
electrodes compared to the butterfly capacitor, as well as a
rotation angle of up to 180°, the separation of rotor plates
incurs some losses since RF current has to pass the rotor axis
instead of flowing straight through each rotor vane.
)