Superconducting filter with reduced electromagnetic leakage

Claim 1

A superconducting stripline filter for filtering a received signal, said filter comprising: a first dielectric substrate having a shape with an inner face, said first dielectric substrate having a first plane disposed on the inner face thereof and an axis in the first plane of the inner face, and including a central body region having opposing ends which are approximately perpendicular to the axis of said first dielectric substrate, and first and second microstrip launching regions disposed at the respective opposing ends of said central body region, each microstrip launching region oriented in the first plane on the inner face and laterally offset from the axis of said first dielectric substrate and having a width less than one half a wavelength of a waveguide mode associated with the received signal and having a length sufficient to attenuate the waveguide mode by a predetermined amount of loss; a second dielectric substrate having a first face positioned to oppose the inner face of said first dielectric substrate and a shape corresponding to the shape of said central body region, said second dielectric substrate having a ground plane disposed on the first face thereof and absorbing stripes disposed along said ground plane; superconducting resonator stripes disposed on said central body region of said first dielectric substrate on the inner face thereof, approximately parallel to the axis of said first dielectric substrate; and at least one microstrip disposed on each microstrip launching region of said first dielectric substrate on the inner face thereof.