Patent ID: 9245732
Filing Date: 2016-01-26
CPC Classification: H01J

Claim Text:
1. A lighting apparatus comprising: a magnetron configured to generate microwaves having a predetermined frequency; a waveguide including a first wave guide space configured to introduce and guide the microwaves and a second wave guide space expanded from the first wave guide space; a resonator to which the microwaves are transmitted from the waveguide; and a bulb located in the resonator, the bulb encapsulating a light emitting material and being configured to emit light in response to the transmitted microwaves, wherein the second wave guide space is located in a transmission path of the microwaves transmitted from the magnetron to the resonator, and wherein the second wave guide space is configured such that odd harmonics of the microwaves transmitted through the first wave guide space are reflected from the second wave guide space to the resonator and the even harmonics of the microwaves transmitted through the first wave guide space are introduced into and grounded in the second wave guide space.