The present invention provides a millimeter-wave passive FET switch by using impedance transformation network to transfer the effective capacitance seen from the drain to source of an FET at off-state to low impedance, while transfer low impedance seen at on-state to high impedance. Such sharp objects include hypodermic needles, scalpel blades, cannulae, trocars, and the like. By placing the triac in thermal contact with the panel frame, the cover, the chase, or the mounting member, the heat from the triac may be used to complement the heat supplied by the assembly.