Patents by Inventor Bon Hee Koo
Bon Hee Koo 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: 6597263Abstract: A dielectric filter having a notch pattern includes a dielectric block, in which a ground face plated with conductive metal for all the rest portions excepting an upper face thereof and both side given portions of one side wall face connected to the upper face is formed and numerous patterns plated with the conductive metal are formed on the upper face as a non-conductive part, input electrode provided on one portion out of non-conductive portions and formed so that a signal from the outside may be inputted thereto, at least two resonators formed piercing through upper and lower faces of the dielectric block, a lower end part of which is short-circuited on a lower face as the ground face of the dielectric block, wherein two resonators are connected with each other through a pattern formed on the upper face of the dielectric block in order to resonate and wave-transfer a signal inputted through the input electrode, and output electrode provided in the rest one portion out of the non-conductive portions on oneType: GrantFiled: December 28, 2000Date of Patent: July 22, 2003Assignees: Electronics and Telecommunications Research Institute, Korea Electronics Co.Inventors: Dong-Suk Jun, Bon-Hee Koo, Chang-Hwa Lee, Oh-Gone Chun, Sang-Seok Lee
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Patent number: 6400239Abstract: The objcet of the present invention is to provide a microwave filter having a shield for electromagnetic interference shielding, wherein the filter is adaped for use in a radio frequency circuitry located in a stage next to an antenna for a radio communication system, such as a mobile communication system, a portable communication system, satellite communication system, and IMT-2000, for passing signals having desired frequencies while removing signals having frequencies having undesired frequencies. According to the present invention, there is provided a microwave filter for electromagnetic interference shielding, comprising a block of dielectric material plated with a metal with the exception of one surface, a plurality of resonators contained within the dielectric block, and a shield fixed on the surface which is not plated, wherein the shield has at least an alignment window for securing the easy alignment between the dielectric block and the shield through a visual observation.Type: GrantFiled: February 4, 2000Date of Patent: June 4, 2002Assignee: Electronics and Telecommunications Research InstituteInventors: Oh Gon Chun, Chang Hwa Lee, Bon Hee Koo, Dong Suk Jun, Sang Seok Lee
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Patent number: 6373352Abstract: A duplexer using a dielectric block and having stepped impedance resonators is disclosed. The duplexer comprising open ended resonators arranged in a front side of the dielectric block, shorted resonators arranged in a rear side of the dielectric block, first grooves for controlling receiving coupling at the receiving filter, second grooves for controlling transmitting coupling at the transmitting filter, and a plurality of recesses formed at the bottom of the dielectric block, extending from a first aperture of the open ended resonators to a second aperture of the shorted resonators. The duplexer according to this invention is miniaturized by excluding external elements and has excellent attenuation characteristics, and is being manufactured by simple processes.Type: GrantFiled: April 28, 2000Date of Patent: April 16, 2002Assignee: Electronics and Telecommunications Research InstituteInventors: Chang Hwa Lee, Meyng Soo Kim, Bon Hee Koo, Dong Suk Jun, Sang Seok Lee, Tae Goo Choy
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Patent number: 6326867Abstract: The present invention provides a dielectric filter having a dielectric block, and a plurality of resonators formed within the dielectric block, each of the resonators having a first and second through holes formed vertically through the dielectric block and arranged in series along longitudinal axis of the dielectric block and a coupling portion electrically connecting an end of the first through hole to an end of the second through hole.Type: GrantFiled: December 30, 1999Date of Patent: December 4, 2001Assignee: Electronics and Telecommunications Research InstituteInventors: Chang Hwa Lee, Bon Hee Koo, O Gon Chun, Dong Seok Jeon, Sang Seok Lee
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Publication number: 20010008388Abstract: A dielectric filter having a notch pattern includes a dielectric block, in which a ground face plated with conductive metal for all the rest portions excepting an upper face thereof and both side given portions of one side wall face connected to the upper face is formed and numerous patterns plated with the conductive metal are formed on the upper face as a non-conductive part, input electrode provided on one portion out of non-conductive portions and formed so that a signal from the outside may be inputted thereto, at least two resonators formed piercing through upper and lower faces of the dielectric block, a lower end part of which is short-circuited on a lower face as the ground face of the dielectric block, wherein two resonators are connected with each other through a pattern formed on the upper face of the dielectric block in order to resonate and wave-transfer a signal inputted through the input electrode, and output electrode provided in the rest one portion out of the non-conductive portions on oneType: ApplicationFiled: December 28, 2000Publication date: July 19, 2001Inventors: Dong-Suk Jun, Bon-Hee Koo, Chang-Hwa Lee, Oh-Gone Chun, Sang-Seok Lee
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Patent number: 6150906Abstract: An HF filter using resonators of a convex-concave structure is capable of easily inserting a serial or parallel capacitance inside the resonators for the sake of a characteristic improvement of frequency at a stop band desired. In the inventive HF filter, an error compensation is simple and a size smallization is available, by utilizing the resonators of the convex-concave structure.Type: GrantFiled: December 15, 1998Date of Patent: November 21, 2000Assignee: Electronics and Telecommunications Research InstituteInventors: Chang Hwa Lee, Bon Hee Koo, Oh Gon Chun, Sang Seok Lee
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Patent number: 6130587Abstract: An isolator/circulator can keep a size of a 3-way asymmetric propeller resonator and intensity of magnetism, control the preferred frequency, and improve the insertion loss and isolation characteristic due to reducing the ferrite usage region on the maximum, extend the wide band without the external wide band extension, finally to miniaturize, reduce the fabricating cost by means of a simple fabrication. A microstrip/stripline isolator/circulator having a propeller resonator can be used for the device protection and impedance matching of a system and terminal in a transfer communication, personal communication, CT and satellite communication.Type: GrantFiled: August 10, 1998Date of Patent: October 10, 2000Assignee: Electronics and Telecommunications Research InstituteInventors: Dong Suk Jun, Meyung Soo Kim, Bon Hee Koo, Chang Hwa Lee, Sang Seok Lee, Tae Goo Choy
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Patent number: 6054909Abstract: The present invention relates to a microwave filter, having U-type resonators, which passes a desired frequency signal and removes an undesired frequency signal when used in a high frequency antenna circuit for wireless communication systems. In accordance with the trend of reducing communication system terminals, it is required to reduce a high frequency filter. The high frequency filter is required to attenuate signals very sharply at the stop band especially near to a passband transmitting and receiving frequency, so as to improve the efficiency of the frequency. The filter may be reduced in weight by forming U-type resonators instead of straight-type resonators. Excellent attenuation characteristics may be achieved at the stop band lower than the passband, using the difference of the characteristic impedance between the open end portion and the shorted portion of the resonator by forming the coupling control grooves at the outer walls of the dielectric block.Type: GrantFiled: August 21, 1998Date of Patent: April 25, 2000Assignee: Electronics and Telecommunications Research InstituteInventors: Chang Hwa Lee, Myung Soo Kim, Bon Hee Koo, Dong Suk Jun, Sang Seok Lee, Tae Goo Choy
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Patent number: 5886986Abstract: A duplexer having dual coupled line characteristics is disclosed. With a small number of resonators and without using an external device such as a chip inductor or a chip capacitor, the signals of the receiving frequency can be improvingly damped. The diameters of the transmitting terminal dielectric filter resonators and the receiving terminal dielectric filter resonators are not same, but their diameters at an open terminal and at a short circuit terminal are made different from each other so as to differentiate a coupling amount at the short circuit terminal from that at the open terminal. Further, the transmitting terminal filter resonators and the receiving terminal dielectric filter resonator are provided in a form of grooves, and sizes of the grooves near the open terminal are made different from those of the grooves near the short circuit terminal so as to differentiate a coupling amount of the resonators at the short circuit terminal from those at the open terminal.Type: GrantFiled: April 25, 1997Date of Patent: March 23, 1999Assignees: Electronics and Telecommunications Research Institute, Korea TelecommunicationInventors: Chang-Hwa Lee, Meyng-Soo Kim, Bon-Hee Koo, Dong-Suk Jun, Sang-Seok Lee, Tae-Goo Choy