Electrodeless lighting system

Disclosed is an electrodeless lighting system capable of being used as an optical source of an electronic device by being minimized and capable of obtaining an optimum impedance matching and controlling a resonance frequency. The electrodeless lighting system comprises: a magnetron (101) for generating microwave and having an antenna (101a) through which the microwave is outputted; a resonator (102) having a resonance space (111) where the microwave is resonated and having an inner diameter partially different along a path that the microwave passes; a bulb (104) installed inside the resonator (102) and having a light emitting material therein for emitting light by the microwave energy; and a microwave feeder (103) of which one side (121) is connected to the antenna (101a) and another side (123) thereof is connected to the bulb (104), for guiding microwave to the bulb (104), in which a ratio of an outer diameter of the microwave feeder (103) and a ratio of an inner diameter of the resonator (102) corresponding to the outer diameter of the microwave feeder (103) are varied along a progressive direction of the microwave.