Microwave discharge lamp

Abstract

A microwave discharge lamp includes a discharge bulb which is discharged by a microwave and emits a light, a cylindrical resonant cavity which has at least a portion formed of a conductive mesh of net structure and is disposed to cover the discharge bulb, a main antenna which has one end supplied with microwave power through a bottom surface of the resonant cavity and the other end electrically contacting a side surface of the resonant cavity to be grounded, and a dummy antenna which has one end electrically grounded to the bottom surface of the resonant cavity and the other end electrically grounded to the side surface of the resonant cavity and is disposed opposite to the main antenna to be symmetrical to the main antenna about a central axis of the resonant cavity.

Dependencies are inferred from the claim text.