Patent ID: 8164264

Claim:
A lamp to be driven from a source of microwave energy, the lamp comprising: an electrodeless discharge bulb; a radiator for radiating microwave energy to the bulb; a bulb receptacle formed of ceramic material coated with an electrically conductive shield, the receptacle comprising: a first recess containing the bulb, the recess being open to allow light to shine from the bulb, and a second recess containing the radiator, with the second recess being open to allow connection of microwaves to the radiator; and a microwave circuit comprising: an input for microwave energy from the source thereof; an output for connect thereof to the radiator in the ceramic receptacle; and a combination of the input, the output, the receptacle and the bulb, wherein the microwave circuit comprises: a capacitative-inductive circuit configured as a bandpass filter and matching output impedance of the source of microwave energy to input impedance of the capacitative-inductive circuit, receptacle and bulb combination; and further comprises a tunable comb line filter; and wherein the microwave circuit comprises: a metallic housing; a pair of perfect electric conductors, each grounded inside the housing; a pair of connections to the perfect electric conductors, one for input and the other for output, and a respective tuning element provided in the housing opposite the distal end of each perfect electric conductor.