US 6,674,346 B2 · Evanescent resonators

Abstract

A evanescent resonator device includes a short-circuited evanescent waveguide and loading capacitor. The evanescent waveguide of the resonator includes a single length of evanescent transmission line terminated in short circuit, a first support substrate having a predetermined dielectric constant, the first support substrate having a top surface and a bottom surface; a dielectrically loaded feed network including: (a) a second substrate arranged on the top surface of the first support substrate, the second substrate having a predetermined dielectric constant that is higher than the first support substrate; and (b) a metal strip arranged on an upper surface of the second substrate, so that the second substrate is arranged between the first support substrate and the second substrate. A ground plane is arranged on the bottom surface of the first support substrate, the support substrate includes a hollow metalized center area being open on an upper end closest to the second substrate. A ratio of the predetermined dielectric constants of said second substrate to said first support substrate ranges from approximately 2 to 200 so to permit reduced size because of the reduction in required capacitance without a reduction in Q value.

Claims63

Dependent claims

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.

9 more elements

Dependencies are inferred from the claim text.

Evanescent resonators

Life of this patent

Evanescent resonators

Life of this patent

Abstract

Claims63