Patent ID: 6674346
Filing Date: 2004-01-06
Classification: H01P

Abstract:
A evanescent resonator device comprising:a short-circuited evanescent waveguide including a single length of evanescent transmission line that is terminated in short circuit; and a loading capacitance; wherein said evanescent waveguide includes: a first support substrate having a predetermined dielectric constant, said first support substrate having a top surface and a bottom surface; wherein said loading capacitance comprises a dielectrically loaded feed network with a shortened guide wavelength, including: (a) a second substrate arranged on the top surface of said first support substrate, said second substrate having a predetermined dielectric constant that is higher than said first support substrate; and (b) a metal strip arranged on an upper surface of said second substrate, so that said second substrate is arranged between said first support substrate and said second substrate; a ground plane arranged on the bottom surface of said first support substrate; wherein said first support substrate includes a hollow metalized center area being open on an upper end closest to said second substrate; and wherein a ratio of the predetermined dielectric constants of said second substrate to said first support substrate ranges from approximately 2 to 200.