Input/output systems and devices for use with superconducting devices

An electrical filter device comprising:

• a dielectric substrate including a signal surface and a ground surface distinct from the signal surface, the dielectric substrate having an input end and an output end, at least a first wide region between the input and the output ends, the first wide region having a first through-hole and a second through-hole, and at least a first narrow region between the input and the output ends;
• a first input conductive trace and a second input conductive trace carried by the signal surface at least proximate the input end of the dielectric substrate;
• a first output conductive trace and a second output conductive trace carried by the signal surface at least proximate the output end of the dielectric substrate;
• a first signal conductive trace and a second signal conductive trace carried by the signal surface in the first wide region of the dielectric substrate;
• a first ground conductive trace carried by the ground surface in the first wide region of the dielectric substrate, such that the first and the second signal conductive traces are electrically insulated from the first ground conductive trace;
• a first length of conductor, wherein at least a portion of the first length of conductor is wound about the first narrow region of the dielectric substrate to form a first bottom coil;
• a second length of conductor, wherein at least a portion of the second length of conductor is wound about the at least a portion of the first length of conductor that is wound about the first narrow region of the dielectric substrate to form a first top coil, wherein the first top coil is wound about the first bottom coil to form a first top-bottom coil pair;
• a first capacitor and a second capacitor;
• an enclosure including a first open end and a second open end, wherein the enclosure is formed by substantially non-magnetic metal that separates an inner volume of the enclosure from an exterior thereof, and wherein the dielectric substrate, the first top-bottom coil pair, the first capacitor, and the second capacitor are received in the inner volume of the enclosure;
• an input connector electrically connected to at least one of the first and the second input conductive traces, wherein the input connector physically couples to the enclosure, thereby closing the first open end of the enclosure;
• and
• an output connector electrically connected to at least one of the first and the second output conductive traces, wherein the output connector physically couples to the enclosure, thereby closing the second open end of the enclosure, and wherein:
• the first narrow region is interrupted by a first coiling tab that divides the first narrow region into a first leftmost section and a first rightmost section;
• the first length of conductor and the second length of conductor are both wound about the first leftmost section in a same coiling direction with respect to one another;
• one of the first length of conductor or the second length of conductor is wound at least partially around the first coiling tab;
• and
• the first length of conductor and the second length of conductor are wound about the first rightmost section in opposite coiling directions with respect to one another.