A MEM switch is described having a free moving element within in
micro-cavity, and guided by at least one inductive element. The switch
consists of an upper inductive coil; an optional lower inductive coil,
each having a metallic core preferably made of permalloy; a micro-cavity;
and a free-moving switching element preferably also made of magnetic
material. Switching is achieved by passing a current through the upper
coil, inducing a magnetic field in the coil element. The magnetic field
attracts the free-moving magnetic element upwards, shorting two open
wires and thus, closing the switch. When the current flow stops or is
reversed, the free-moving magnetic element drops back by gravity to the
bottom of the micro-cavity and the wires open. When the chip is not
mounted with the correct orientation, gravity cannot be used. In such an
instance, a lower coil becomes necessary to pull the free-moving
switching element back and holding it at its original position.