Microwave resonator for operation in the whispering-gallery mode
First Claim
1. A microwave resonator having a resonant element for operation in the whispering-gallery mode, wherein the resonant element includes a flat circular disk having a diameter and a thickness, wherein said diameter is considerable larger than said thickness, and wherein said flat disk, when excited by an external excitation means, provides electromagnetic waves having resonant frequencies which are proportional to the diameter of the disk, said electromagnetic wave being confined in the whispering-gallery mode between a radius located at a periphery of the disk and a caustic internal surface having a radius smaller than the radius of said disk.
1 Assignment
0 Petitions
Accused Products
Abstract
A microwave resonator for operation in the whispering-gallery mode is constituted by a resonant element included in a flat disk having a diameter (2a) which is considerably larger than its thickness (2d). An electromagnetic wave which propagates within the disk is confined between the periphery of this latter and a so-called caustic surface having a smaller radius (ac). The wave does not radiate to the exterior and the resonator can be placed on a dielectric or metallic substrate. The disk can be hollowed-out within the caustic surface. A resonator can be simulated within the thickness of a dielectric substrate by at least one metallic ring which forms a magnetic short-circuit with the ground plane. Excitation is produced by microstrips or by dielectric image waveguides.
-
Citations
18 Claims
- 1. A microwave resonator having a resonant element for operation in the whispering-gallery mode, wherein the resonant element includes a flat circular disk having a diameter and a thickness, wherein said diameter is considerable larger than said thickness, and wherein said flat disk, when excited by an external excitation means, provides electromagnetic waves having resonant frequencies which are proportional to the diameter of the disk, said electromagnetic wave being confined in the whispering-gallery mode between a radius located at a periphery of the disk and a caustic internal surface having a radius smaller than the radius of said disk.
Specification