| 摘要 |
<p>An elongated microwave powered lamp (1 ) achieves the direct excitation of a double-length plasma column, without requiring further waveguides or the like with the best possible efficiency of the elongated lamp, and includes: a transparent elongated bulb (2) containing, in an inner space thereof, a material apt to be excited by microwave irradiation thereby emitting an electromagnetic radiation, the elongated bulb (2) extending along a continuous profile with two opposite bulb ends (21, 22); two microwave coaxial antennas (71, 72), placed outside said bulb (2), respectively connected to a microwave source (81, 82) via corresponding antenna leads (91, 92), said bulb (2) and said microwave coaxial antennas (71, 72) being displaced in a close relationship to each other to allow the microwave excitation of said material, wherein the bulb (2) is shaped so as to form an open channel (4) in the form of a passing through hole extending said bulb (2) with two opposite channel end openings (41, 42) at said bulb ends (21, 22) respectively, said coaxial antennas (71, 72) being inserted into the open channel (4) from respective opposite channel end openings (41, 42) with their leads (91, 92) entering the bulb (2) at opposite ends (21, 22) thereof and being displaced head-to-head, forming a continuous line substantially corresponding to said continuous profile, with respective facing distal ends (73) of said coaxial antennas (71, 72) forming a gap therebetween.</p> |
