Patent ID: 6778042
Filing Date: 2004-08-17
Classification: H01P

Abstract:
A high-frequency device comprising:a dielectric substrate with a first and a second main surface; a filter element having a microstrip line structure, including a plurality of resonating elements made of a first superconductor film on said first main surface of said dielectric substrate; a dielectric plate having a third and a fourth main surface, said third main surface of said dielectric plate facing said first main surface of said dielectric substrate, said dielectric plate being substantially in parallel with said first main surface, wherein when a maximum value and a minimum value of a spacing between said third main surface of said dielectric plate and a surface of said first superconductor film is L and S respectively, a value of an expression 2Ã—(Lâˆ’S)/(L+S) is 0.3 or less, and said dielectric plate covering at least a part of said plurality of resonating elements; and a spacing adjusting member configured to control a spacing between said third main surface of said dielectric plate and said first main surface of said dielectric substrate.