Patents by Inventor Chang-Seob Choi
Chang-Seob Choi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11936417Abstract: The present invention relates to a time-division duplex (TDD) antenna apparatus which can reduce signal loss, and thereby minimize the noise figure (NF) of a system and extend uplink coverage of the system, by separating a transmitter circuit from a receiver circuit of the antenna apparatus, and disposing a low noise amplifier (LNA) of the receiver circuit between a reception antenna and a reception filter of the receiver. A time-division duplex antenna apparatus according to an embodiment of the present invention includes: a transmitter which includes at least one transmission antenna module and transmits a downlink signal through a first path; a receiver which includes at least one reception antenna module and receives an uplink signal through a second path that is separated from the first path without any overlapping portions thereof; and a controller which controls the transmitter and the receiver in a time-division duplex manner.Type: GrantFiled: December 2, 2021Date of Patent: March 19, 2024Assignee: KMW INC.Inventors: Duk Yong Kim, Min Seon Yun, Bae Mook Jeong, Chang Seob Choi, Su Won Lee
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Publication number: 20220094386Abstract: The present invention relates to a time-division duplex (TDD) antenna apparatus which can reduce signal loss, and thereby minimize the noise figure (NF) of a system and extend uplink coverage of the system, by separating a transmitter circuit from a receiver circuit of the antenna apparatus, and disposing a low noise amplifier (LNA) of the receiver circuit between a reception antenna and a reception filter of the receiver. A time-division duplex antenna apparatus according to an embodiment of the present invention includes: a transmitter which includes at least one transmission antenna module and transmits a downlink signal through a first path; a receiver which includes at least one reception antenna module and receives an uplink signal through a second path that is separated from the first path without any overlapping portions thereof; and a controller which controls the transmitter and the receiver in a time-division duplex manner.Type: ApplicationFiled: December 2, 2021Publication date: March 24, 2022Applicant: KMW INC.Inventors: Duk Yong KIM, Min Seon YUN, Bae Mook JEONG, Chang Seob CHOI, Su Won LEE
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Patent number: 10985472Abstract: The present invention provides a waveguide slot array antenna having an excitation slot arrangement radiating a signal corresponding to an operating frequency in a radiation plate, the waveguide slot array antenna comprising: a first auxiliary radiation plate installed on a main radiation plate and rotating a polarization plane of a signal radiated from the excitation slot arrangement of the main radiation plate; and a second auxiliary radiation plate installed on the first auxiliary radiation plate and distributing and radiating the signal, the polarization plane of which has been rotated in the first auxiliary radiation plate.Type: GrantFiled: February 25, 2020Date of Patent: April 20, 2021Assignee: KMW INC.Inventors: Young-Chan Moon, Chang-Seob Choi, Chi-Back Ryu, Yong-Won Seo
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Publication number: 20200194902Abstract: The present invention provides a waveguide slot array antenna having an excitation slot arrangement radiating a signal corresponding to an operating frequency in a radiation plate, the waveguide slot array antenna comprising: a first auxiliary radiation plate installed on a main radiation plate and rotating a polarization plane of a signal radiated from the excitation slot arrangement of the main radiation plate; and a second auxiliary radiation plate installed on the first auxiliary radiation plate and distributing and radiating the signal, the polarization plane of which has been rotated in the first auxiliary radiation plate.Type: ApplicationFiled: February 25, 2020Publication date: June 18, 2020Applicant: KMW INC.Inventors: Young-Chan MOON, Chang-Seob CHOI, Chi-Back RYU, Yong-Won SEO
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Patent number: 10622726Abstract: The present invention provides a waveguide slot array antenna having an excitation slot arrangement radiating a signal corresponding to an operating frequency in a radiation plate, the waveguide slot array antenna comprising: a first auxiliary radiation plate installed on a main radiation plate and rotating a polarization plane of a signal radiated from the excitation slot arrangement of the main radiation plate; and a second auxiliary radiation plate installed on the first auxiliary radiation plate and distributing and radiating the signal, the polarization plane of which has been rotated in the first auxiliary radiation plate.Type: GrantFiled: May 10, 2017Date of Patent: April 14, 2020Assignee: KMW INC.Inventors: Young-Chan Moon, Chang-Seob Choi, Chi-Back Ryu, Yong-Won Seo
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Patent number: 9992757Abstract: The present invention relates to a mobile communication base station system comprising: a donor unit connected to a baseband unit; and a remote unit installed at the base station antenna side, wherein the donor unit has a baseband signal processing part including a digital signal processing part for processing interface with the baseband unit, a wireless communication part for processing a wireless communication signal between the baseband signal processing part and the remote unit, and a synchronization and communication control part for processing a synchronizing signal and a communication control signal from the baseband unit, and wherein the remote unit has a service signal processing part for processing MIMO interface with a base station antenna, a wireless communication part for processing a wireless communication signal between the service signal processing part and the donor unit, and a synchronization and communication control part for processing a synchronizing signal and a communication control sigType: GrantFiled: April 28, 2016Date of Patent: June 5, 2018Assignees: KMW INC., Sogang University Research FoundationInventors: Young-Chan Moon, Myong-Sik Lee, Chang-Seob Choi, Dae-Hyoung Hong, Sang-Won Yun, Won-Jin Sung, Young-Lok Kim, Ok-Hyun Jeong, Doo-Hun Choi
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Patent number: 9917626Abstract: A base station apparatus of mobile communication system is provided, including an antenna system including first antenna for transceiving signals for a first path among MIMO paths, and a second antenna for transceiving signals for a second path among the MIMO paths, a first duplexer including transmission filter for processing the transmitted signal of first path and reception filter for processing the received signal of second path, a second duplexer including reception filter for processing the received signal of first path and transmission filter for processing the transmitted signal of second path, and a path change unit for providing the transmitted signal provided from the first duplexer to the first antenna and the received signal provided from the first antenna to the second duplexer and to provide the transmitted signal from the second duplexer to the second antenna and the received signal from the second antenna to the first duplexer.Type: GrantFiled: April 3, 2017Date of Patent: March 13, 2018Assignee: KMW INC.Inventors: Young-Chan Moon, Nam-Shin Park, Chang-Seob Choi, In-Ho Na
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Patent number: 9917627Abstract: A base station apparatus of mobile communication system is provided, including an antenna system including first antenna for transceiving signals for a first path among MIMO paths, and a second antenna for transceiving signals for a second path among the MIMO paths, a first duplexer including transmission filter for processing the transmitted signal of first path and reception filter for processing the received signal of second path, a second duplexer including reception filter for processing the received signal of first path and transmission filter for processing the transmitted signal of second path, and a path change unit for providing the transmitted signal provided from the first duplexer to the first antenna and the received signal provided from the first antenna to the second duplexer and to provide the transmitted signal from the second duplexer to the second antenna and the received signal from the second antenna to the first duplexer.Type: GrantFiled: April 3, 2017Date of Patent: March 13, 2018Assignee: KMW INC.Inventors: Young-Chan Moon, Nam-Shin Park, Chang-Seob Choi, In-Ho Na
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Publication number: 20170244173Abstract: The present invention provides a waveguide slot array antenna having an excitation slot arrangement radiating a signal corresponding to an operating frequency in a radiation plate, the waveguide slot array antenna comprising: a first auxiliary radiation plate installed on a main radiation plate and rotating a polarization plane of a signal radiated from the excitation slot arrangement of the main radiation plate; and a second auxiliary radiation plate installed on the first auxiliary radiation plate and distributing and radiating the signal, the polarization plane of which has been rotated in the first auxiliary radiation plate.Type: ApplicationFiled: May 10, 2017Publication date: August 24, 2017Inventors: Young-Chan MOON, Chang-Seob CHOI, Chi-Back RYU, Yong-Won SEO
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Publication number: 20170207836Abstract: A base station apparatus of mobile communication system is provided, including an antenna system including first antenna for transceiving signals for a first path among MIMO paths, and a second antenna for transceiving signals for a second path among the MIMO paths, a first duplexer including transmission filter for processing the transmitted signal of first path and reception filter for processing the received signal of second path, a second duplexer including reception filter for processing the received signal of first path and transmission filter for processing the transmitted signal of second path, and a path change unit for providing the transmitted signal provided from the first duplexer to the first antenna and the received signal provided from the first antenna to the second duplexer and to provide the transmitted signal from the second duplexer to the second antenna and the received signal from the second antenna to the first duplexer.Type: ApplicationFiled: April 3, 2017Publication date: July 20, 2017Inventors: Young-Chan Moon, Nam-Shin Park, Chang-Seob Choi, In-Ho Na
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Publication number: 20170207835Abstract: A base station apparatus of mobile communication system is provided, including an antenna system including first antenna for transceiving signals for a first path among MIMO paths, and a second antenna for transceiving signals for a second path among the MIMO paths, a first duplexer including transmission filter for processing the transmitted signal of first path and reception filter for processing the received signal of second path, a second duplexer including reception filter for processing the received signal of first path and transmission filter for processing the transmitted signal of second path, and a path change unit for providing the transmitted signal provided from the first duplexer to the first antenna and the received signal provided from the first antenna to the second duplexer and to provide the transmitted signal from the second duplexer to the second antenna and the received signal from the second antenna to the first duplexer.Type: ApplicationFiled: April 3, 2017Publication date: July 20, 2017Inventors: Young-Chan Moon, Nam-Shin Park, Chang-Seob Choi, In-Ho Na
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Publication number: 20160242130Abstract: The present invention relates to a mobile communication base station system comprising: a donor unit connected to a baseband unit; and a remote unit installed at the base station antenna side, wherein the donor unit has a baseband signal processing part including a digital signal processing part for processing interface with the baseband unit, a wireless communication part for processing a wireless communication signal between the baseband signal processing part and the remote unit, and a synchronization and communication control part for processing a synchronizing signal and a communication control signal from the baseband unit, and wherein the remote unit has a service signal processing part for processing MIMO interface with a base station antenna, a wireless communication part for processing a wireless communication signal between the service signal processing part and the donor unit, and a synchronization and communication control part for processing a synchronizing signal and a communication control sigType: ApplicationFiled: April 28, 2016Publication date: August 18, 2016Inventors: Young-Chan Moon, Myong-Sik Lee, Chang-Seob Choi, Dae-Hyoung Hong, Sang-Won Yun, Won-Jin Sung, Young-Lok Kim, Ok-Hyun Jeong, Doo-Hun Choi