# US 10,872,756 B2 · Microwave discharge lamp > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,872,756 B2 - Document ID: US10872756B2 - Status: Granted - Kind: B2 - Application number: 16/640,640 - Filed: 2018-08-13 - Published: 2020-11-12 - Granted: 2020-12-22 - Earliest claimed: 2017-08-30 - Assignees: Maltani Corporation - Applicants: Maltani Corporation - Inventors: Jin Joong Kim; Kyoung-Shin Kim; Hyun-Sung Yoon - Web page: https://patentgrep.com/patent/US10872756B2 ## CPC - H01J 65/044: {the field being produced by a separate microwave unit} - H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H) ## 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. ## Claims ### Claim 1 A microwave discharge lamp comprising: 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. ### Claim 2 (depends on 1) The microwave discharge lamp as set forth in claim 1, wherein the resonant cavity comprises: a bottom resonant cavity which has a bottom surface into which the main antenna is inserted, is formed of a conductive material, and has an opened top surface; and a top resonant cavity which is coupled with the top surface of the bottom resonant cavity and has a side surface and a top surface formed of a conductive mesh, and the discharge bulb is disposed at the top resonant cavity. ### Claim 3 (depends on 2) The microwave discharge lamp as set forth in claim 2, wherein the discharge bulb comprises: a top pillar extending in a center direction of the top resonant cavity to be fixed to the top resonant cavity; and a bottom pillar extending in a center direction of the bottom resonant cavity to be fixed to the bottom resonant cavity. ### Claim 4 (depends on 2) The microwave discharge lamp as set forth in claim 2, further comprising: a reflection plate disposed at the boundary between the top resonant cavity and the top resonant cavity, wherein the reflection plate has a through-hole formed in its center, the bottom pillar extends through the through-hole of the reflection plate, and one side of the reflection plate facing the discharge bulb has a dielectric multilayer reflective structure to reflect light emitted from the discharge bulb. ### Claim 5 (depends on 2) The microwave discharge lamp as set forth in claim 2, wherein the top resonant cavity comprises: a cylindrical conductive ring which is formed of a conductive material and is inserted in an outer circumferential surface of the bottom resonant cavity to be in electric contact with the bottom resonant cavity; and a mesh cylinder which is fixed to the conductive ring. ### Claim 6 (depends on 1) The microwave discharge lamp as set forth in claim 1, further comprising: a microwave power supply which supplies microwave power to the main antenna; and a transmission line of a coaxial cable structure which transmits the microwave power of the microwave power supply to the main antenna. ### Claim 7 (depends on 1) The microwave discharge lamp as set forth in claim 1, wherein the resonant cavity provides a circular TM010 mode or a circular TM011 mode. ### Claim 8 (depends on 1) The microwave discharge lamp as set forth in claim 1, wherein a frequency band of the microwave is 2.45±0.05 GHz. ### Claim 9 (depends on 1) The microwave discharge lamp as set forth in claim 1, wherein the discharge bulb is cylindrical or elliptical. ### Claim 10 A microwave discharge lamp comprising: 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; and a microwave generator which directly radiates a microwave to the center of a bottom surface of the resonant cavity, wherein the resonant cavity comprises: a bottom resonant cavity whose bottom surface has the center in which an antenna of the microwave generator is inserted and which is formed of a conductive material and has an opened top surface; and a top resonant cavity which is coupled with a top surface of the bottom resonant cavity and has a side surface and a top surface formed of a conductive mesh. ### Claim 11 (depends on 10) The microwave discharge lamp as set forth in claim 10, wherein the microwave generator is a magnetron. ### Claim 12 (depends on 10) The microwave discharge lamp as set forth in claim 10, wherein the resonant cavity creates a circular TM010 mode or a circular TM011 mode. ### Claim 13 (depends on 10) The microwave discharge lamp as set forth in claim 10, wherein the discharge bulb comprises: a top pillar extending in a center direction of the top resonant cavity to be fixed to the top resonant cavity; and a bottom pillar extending in a center direction of the bottom resonant cavity to be fixed to the bottom resonant cavity. ### Claim 14 (depends on 10) The microwave discharge lamp as set forth in claim 10, further comprising: reflection plate disposed at the boundary between the top resonant cavity and the top resonant cavity, wherein the reflection plate has a through-hole formed in its center, the bottom pillar extends through the through-hole of the reflection plate, and one side of the reflection plate facing the discharge bulb has a dielectric multilayer reflective structure to reflect light emitted from the discharge bulb. ### Claim 15 (depends on 10) The microwave discharge lamp as set forth in claim 10, wherein the top resonant cavity comprises: a cylindrical conductive ring which is formed of a conductive material and is inserted in an outer circumferential surface of the bottom resonant cavity to be in electric contact with the bottom resonant cavity; and a mesh cylinder which is fixed to the conductive ring.