Abstract: A rotary electric machine (1000) including: a rotor (200); a stator (100) surrounding a periphery of the rotor (200); a first recessed portion (133) disposed in an inner circumferential surface of a back yoke (130) of the stator (100), and extending in an axial direction of the stator (100); and a tooth (120) having one end fitted in the first recessed portion (133), a clearance formed between the first recessed portion (133) and the one end of the tooth (120) fitted in the first recessed portion (133) being smaller in a circumferential direction of the stator (100) than in a radial direction of the stator (100).

Abstract: A compact multi-stage dielectric resonator apparatus is formed either by placing two or more axially elongated inner conductors axially separated from each other inside a throughhole through a dielectric block such that the mutually separated inner conductors are coupled capacitively across an electrode-free region which separates them and a multi-stage resonator is thereby formed, or by attaching a plurality of single-stage dielectric resonators to such a multi-stage resonator to form a unistructural apparatus. Each of these single-stage dielectric resonators has a dielectric block with a throughhole containing an axially extending inner conductor. Outer surfaces of the resonators are substantially entirely covered by outer conductors but openings in the outer conductor and coupling-providing conductors insulated from and entirely surrounded by the outer conductor are provided for magnetically and electrostatically coupling the resonators which are attached together.

Abstract: A compact multi-stage dielectric resonator apparatus is formed by attaching together many dielectric resonators having different resonant frequencies. Each of these dielectric resonators has a dielectric block with a throughhole containing an axially extending inner conductor. The length of the inner conductor for each resonator is either about one-quarter or one-half wavelength of the corresponding resonant frequency. Outer surfaces of the resonators are substantially entirely covered by outer conductors but openings and/or coupling-providing conductors insulated from and entirely surrounded by the outer conductor are provided for magnetically and/or electrostatically coupling the resonators which are attached together. Signal input-output terminals may also be provided separated from and surrounded by the outer conductors for easy mounting of the apparatus on a circuit board.