Patent ID: 9041291
Filing Date: 2015-05-26
Classification: H01J,H01Q

Abstract:
1. A lamp being driven from a source of microwave energy, the lamp comprising: a radiator for radiating microwave energy to a bulb, a fabrication of solid-dielectric, lucent material, the fabrication providing at least: a Faraday cage: at least partially inductive coupling means including the radiator for introducing plasma exciting electromagnetic waves into the waveguide at a position at least substantially surrounded by solid dielectric material; whereby on introduction of electromagnetic waves of a determined frequency a plasma is established in the void and light is emitted via the Faraday cage; the arrangement being such that there is: a microwave circuit having: wherein the microwave circuit is a capacitive-inductive circuit configured as a bandpass filter and matching output impedance of the source of microwave energy to input impedance of the circuit, receptacle and bulb combination; and a tunable comb line filter; and wherein the microwave circuit comprises: a metallic housing; a pair of perfect electric conductors (PECs), each grounded inside the housing a pair of connections connected to the PECs, one for input and the other for output and a respective tuning element provided in the housing opposite the distal end of each PEC.