Patents by Inventor Kwai-Man Luk
Kwai-Man Luk 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: 11955733Abstract: The present invention provides a new wideband mm-wave end-fire magneto-electric dipole antenna with excellent beam-scanning radiation patterns and reasonably low side lobes and low cross polarizations. The antenna comprises: an asymmetrical substrate integrated coaxial line feed comprising: a first substrate having a first substrate thickness; a second substrate placed on the first substrate and having a second substrate thickness different from the first substrate thickness; a conductive signal line deposited on an upper surface of the first substrate; and two rows of waveguiding vias positioned along and at both sides of the signal line respectively; a ?-shaped probe adopted to excite the antenna; a pair of shorted planar parallel plates serving as magnetic dipole and two pair of vertical conductive vias serving as electric dipole; and a folded vertical reflector consisting of conductive vias and strips is added to reduce the back radiation and to improve the gain of antenna.Type: GrantFiled: September 2, 2021Date of Patent: April 9, 2024Assignee: City University of Hong KongInventors: Kwai Man Luk, Ao Li
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Publication number: 20230352837Abstract: A patch antenna includes: a patch arrangement; a ground plane; a dielectric substrate disposed between the patch arrangement and the ground plane; and a feed mechanism for feeding the patch antenna. The patch arrangement comprises a substantially-transparent dielectric layer and a substantially-transparent electrically-conductive layer that at least partly overlap in plan view.Type: ApplicationFiled: April 28, 2022Publication date: November 2, 2023Inventors: Kwai Man LUK, Jie SUN
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Publication number: 20230076567Abstract: The present invention provides a new wideband mm-wave end-fire magneto-electric dipole antenna with excellent beam-scanning radiation patterns and reasonably low side lobes and low cross polarizations. The antenna comprises: an asymmetrical substrate integrated coaxial line feed comprising: a first substrate having a first substrate thickness; a second substrate placed on the first substrate and having a second substrate thickness different from the first substrate thickness; a conductive signal line deposited on an upper surface of the first substrate; and two rows of waveguiding vias positioned along and at both sides of the signal line respectively; a ?-shaped probe adopted to excite the antenna; a pair of shorted planar parallel plates serving as magnetic dipole and two pair of vertical conductive vias serving as electric dipole; and a folded vertical reflector consisting of conductive vias and strips is added to reduce the back radiation and to improve the gain of antenna.Type: ApplicationFiled: September 2, 2021Publication date: March 9, 2023Inventors: Kwai Man LUK, Ao LI
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Patent number: 11404786Abstract: A planar complementary antenna and an antenna array with multiple planar complementary antennas. The planar complementary antenna has a substrate, a planar dipole antenna arranged on the substrate, a loop antenna arranged on the substrate and operably connected with the planar dipole antenna, and a feed network for connection with a feed source. The feed network is operably connected with the planar dipole antenna and the loop antenna for feeding an electrical signal from the feed source to the planar dipole antenna and the loop antenna so as to form an electric dipole at the planar dipole antenna and a magnetic dipole at the loop antenna.Type: GrantFiled: July 3, 2019Date of Patent: August 2, 2022Assignee: City University of Hong KongInventors: Kwai Man Luk, Jingtao Zeng
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Patent number: 11387565Abstract: An antenna and methods of fabricating the antenna and a resonator of the antenna. The antenna includes an antenna feed arranged to emit an electromagnetic signal along a predetermined direction; a resonator disposed adjacent to the antenna feed arranged to improve a directivity of the electromagnetic signal being emitted by the antenna feed; wherein the resonator includes a first reflector and a second reflector sandwiching a resonating cavity therebetween; and wherein the first reflector includes a curved reflector surface.Type: GrantFiled: March 25, 2020Date of Patent: July 12, 2022Assignee: City University of Hong KongInventors: Stella W. Pang, Shuyan Zhu, Yuanlong Li, Kwai-Man Luk
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Patent number: 11360134Abstract: System and method for determining gain characteristics of a circularly-polarized antenna. The method includes receiving a measured first amplitude of a forward gain between a circularly-polarized antenna probe of a first type and a linearly-polarized standard-gain antenna, a measured second amplitude of a forward gain between a circularly-polarized antenna probe of a first type and a circularly-polarized antenna under test, and a measured third amplitude of a forward gain between a circularly-polarized antenna probe of a second type and the circularly-polarized antenna under test. The method also includes determining a left-hand circularly-polarized gain and a right-hand circularly-polarized gain of the circularly-polarized antenna under test based on the measured first amplitude, the measured second amplitude, the measured third amplitude, and a cross-polarization level of the circularly-polarized antenna probes of the first and second types. The determination may be performed using one or more processors.Type: GrantFiled: February 6, 2020Date of Patent: June 14, 2022Assignee: City University of Hong KongInventors: Chen Ding, Kwai-Man Luk
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Patent number: 11287458Abstract: System and method for determining gain characteristics of a linearly-polarized antenna. The method includes receiving a measured first amplitude of a forward gain between a circularly-polarized antenna probe and a linearly-polarized standard-gain antenna, a measured second amplitude of a forward gain between the circularly-polarized antenna probe and a linearly-polarized antenna under test, a measured third amplitude of a forward gain between a linearly-polarized antenna probe and the linearly-polarized standard-gain antenna, and a measured fourth amplitude of a forward gain between the linearly-polarized antenna probe and the linearly-polarized antenna under test. The method also includes determining a co-polarization gain and a cross-polarization gain of the linearly-polarized antenna under test based on the measured first amplitude, the measured second amplitude, the measured third amplitude, and the measured fourth amplitude. The determination may be performed using one or more processors.Type: GrantFiled: April 1, 2020Date of Patent: March 29, 2022Assignee: City University of Hong KongInventors: Chen Ding, Kwai-Man Luk
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Publication number: 20210311103Abstract: System and method for determining gain characteristics of a linearly-polarized antenna. The method includes receiving a measured first amplitude of a forward gain between a circularly-polarized antenna probe and a linearly-polarized standard-gain antenna, a measured second amplitude of a forward gain between the circularly-polarized antenna probe and a linearly-polarized antenna under test, a measured third amplitude of a forward gain between a linearly-polarized antenna probe and the linearly-polarized standard-gain antenna, and a measured fourth amplitude of a forward gain between the linearly-polarized antenna probe and the linearly-polarized antenna under test. The method also includes determining a co-polarization gain and a cross-polarization gain of the linearly-polarized antenna under test based on the measured first amplitude, the measured second amplitude, the measured third amplitude, and the measured fourth amplitude. The determination may be performed using one or more processors.Type: ApplicationFiled: April 1, 2020Publication date: October 7, 2021Inventors: Chen Ding, Kwai-Man Luk
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Publication number: 20210305712Abstract: An antenna and methods of fabricating the antenna and a resonator of the antenna. The antenna includes an antenna feed arranged to emit an electromagnetic signal along a predetermined direction; a resonator disposed adjacent to the antenna feed arranged to improve a directivity of the electromagnetic signal being emitted by the antenna feed; wherein the resonator includes a first reflector and a second reflector sandwiching a resonating cavity therebetween; and wherein the first reflector includes a curved reflector surface.Type: ApplicationFiled: March 25, 2020Publication date: September 30, 2021Inventors: Stella W. Pang, Shuyan Zhu, Yuanlong Li, Kwai-Man Luk
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Publication number: 20210247432Abstract: System and method for determining gain characteristics of a circularly-polarized antenna. The method includes receiving a measured first amplitude of a forward gain between a circularly-polarized antenna probe of a first type and a linearly-polarized standard-gain antenna, a measured second amplitude of a forward gain between a circularly-polarized antenna probe of a first type and a circularly-polarized antenna under test, and a measured third amplitude of a forward gain between a circularly-polarized antenna probe of a second type and the circularly-polarized antenna under test. The method also includes determining a left-hand circularly-polarized gain and a right-hand circularly-polarized gain of the circularly-polarized antenna under test based on the measured first amplitude, the measured second amplitude, the measured third amplitude, and a cross-polarization level of the circularly-polarized antenna probes of the first and second types. The determination may be performed using one or more processors.Type: ApplicationFiled: February 6, 2020Publication date: August 12, 2021Inventors: Chen Ding, Kwai-Man Luk
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Publication number: 20210005980Abstract: A planar complementary antenna and an antenna array with multiple planar complementary antennas. The planar complementary antenna has a substrate, a planar dipole antenna arranged on the substrate, a loop antenna arranged on the substrate and operably connected with the planar dipole antenna, and a feed network for connection with a feed source. The feed network is operably connected with the planar dipole antenna and the loop antenna for feeding an electrical signal from the feed source to the planar dipole antenna and the loop antenna so as to form an electric dipole at the planar dipole antenna and a magnetic dipole at the loop antenna.Type: ApplicationFiled: July 3, 2019Publication date: January 7, 2021Inventors: Kwai Man Luk, Jingtao Zeng
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Patent number: 10804610Abstract: An antenna with a substrate having a ground plane includes a fractal antenna arranged on the substrate to achieve aperture miniaturization. The fractal antenna has a first pair of patch antenna sections that are spaced apart. A first pair of electric conductive elements are spaced apart, extending in the substrate, and arranged generally orthogonal to the first pair of patch antenna sections. Each of the first pair of electric conductive elements is operably connected with a respective one of the first pair of patch antenna sections. A first feeding mechanism is operably connected with the first pair of patch antenna sections for feeding the first pair of patch antenna sections.Type: GrantFiled: March 15, 2019Date of Patent: October 13, 2020Assignee: City University of Hong KongInventors: Kwai Man Luk, Yanhong Xu
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Publication number: 20200295461Abstract: An antenna with a substrate having a ground plane includes a fractal antenna arranged on the substrate to achieve aperture miniaturization. The fractal antenna has a first pair of patch antenna sections that are spaced apart. A first pair of electric conductive elements are spaced apart, extending in the substrate, and arranged generally orthogonal to the first pair of patch antenna sections. Each of the first pair of electric conductive elements is operably connected with a respective one of the first pair of patch antenna sections. A first feeding mechanism is operably connected with the first pair of patch antenna sections for feeding the first pair of patch antenna sections.Type: ApplicationFiled: March 15, 2019Publication date: September 17, 2020Inventors: Kwai Man Luk, Yanhong Xu
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Patent number: 10033105Abstract: An aperture coupled, single fed, microstrip line feed for a circularly polarized patch antenna is provided that can transmit transmissions with a low profile, wide impedance, and axial ratio bandwidths. The circularly polarized patch antenna includes a double sided printed circuit board with a non-linear slots etched into a ground plane of one side of the printed circuit board, with a printed microstrip line printed on the opposite side of the printed circuit board. The microstrip line can be hook shaped and intersect each of the slots. The non linear slots can be radially arranged around a locus or area on the circuit board.Type: GrantFiled: October 30, 2017Date of Patent: July 24, 2018Assignee: CITY UNIVERSITY OF HONG KONGInventors: Hau Wah Lai, Ka Ming Mak, Kwai Man Luk, Chi Hou Chan
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Patent number: 9960493Abstract: A patch antenna is presented herein. The patch antenna can include a substrate layer, a dielectric layer and a conductive layer. The substrate layer can include a hollow thermoplastic structure. The dielectric layer can be attached to a surface of the substrate layer. Furthermore, the dielectric layer can include a thermoplastic structure filled with a fluid. The conductive layer can be associated with another surface of the substrate layer.Type: GrantFiled: July 24, 2015Date of Patent: May 1, 2018Assignee: CITY UNIVERSITY OF HONG KONGInventors: Kwai-Man Luk, Yujian Li
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Patent number: 9954288Abstract: A complementary antenna (e.g., wideband complementary antenna) is presented herein. A complementary antenna can include a first dipole portion, a second dipole portion, a first electrically conductive surface, and a second electrically conductive surface. The first dipole portion can include a first patch antenna portion and a second patch antenna portion. The second dipole portion can include a third patch antenna portion and a fourth patch antenna portion electrically coupled to the second patch antenna portion via a strip antenna portion. The first electrically conductive surface can be coupled to the first dipole portion and the second dipole portion via a first set of electrically conductive pins. The second electrically conductive surface can be coupled to the first electrically conductive surface via a second set of electrically conductive pins.Type: GrantFiled: May 15, 2017Date of Patent: April 24, 2018Assignee: CITY UNIVERSITY OF HONG KONGInventors: Kwai-Man Luk, Yujian Li
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Patent number: 9905938Abstract: A dual polarized high gain and wideband complementary antenna is presented herein. A dual polarized antenna can include a ground plane, a folded dipole portion electrically coupled to the ground plane, a shorted patch antenna portion including an open end that is electrically coupled to the folded dipole portion, and a metal plate located at a bottom portion of the dual polarized antenna. In one example, the folded dipole portion can include four folded dipoles. Further, the open end of the shorted patch antenna portion can be electrically coupled to the folded dipole portion using the metal plate. Further, the dual polarized antenna can include two ports—each port including a pair of feeding sources, and each feeding source configured to generate an electric dipole and a magnetic dipole. In another example, magnitudes of the electric dipoles can be equivalent, and magnitudes of the magnetic dipoles can be equivalent.Type: GrantFiled: January 29, 2015Date of Patent: February 27, 2018Assignee: CITY UNIVERSITY OF HONG KONGInventors: Kwok Kan So, Hau Wah Lai, Hang Wong, Chi Hou Chan, Kwai Man Luk
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Publication number: 20180048068Abstract: An aperture coupled, single fed, microstrip line feed for a circularly polarized patch antenna is provided that can transmit transmissions with a low profile, wide impedance, and axial ratio bandwidths. The circularly polarized patch antenna includes a double sided printed circuit board with a non-linear slots etched into a ground plane of one side of the printed circuit board, with a printed microstrip line printed on the opposite side of the printed circuit board. The microstrip line can be hook shaped and intersect each of the slots. The non linear slots can be radially arranged around a locus or area on the circuit board.Type: ApplicationFiled: October 30, 2017Publication date: February 15, 2018Inventors: Hau Wah LAI, Ka Ming MAK, Kwai Man LUK, Chi Hou CHAN
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Patent number: 9843102Abstract: Described herein are shorted bowtie patch antennas. The shorted bowtie patch antenna includes parasitic shorted patches. Signals are received by the shorted bowtie patch antenna. The received signals are propagated to a receiver. Signals sent from a transmitter are transmitted by the shorted bowtie patch antenna. Current is induced in the parasitic shorted patches during receiving and transmitting of signals.Type: GrantFiled: November 14, 2014Date of Patent: December 12, 2017Assignee: CITY UNIVERSITY OF HONG KONGInventors: Hau Wah Lai, Ka Ming Mak, Kwai Man Luk, Chi Hou Chan
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Patent number: 9819088Abstract: An aperture coupled, single fed, microstrip line feed for a circularly polarized patch antenna is provided that can transmit transmissions with a low profile, wide impedance, and axial ratio bandwidths. The circularly polarized patch antenna includes a double sided printed circuit board with a non-linear slots etched into a ground plane of one side of the printed circuit board, with a printed microstrip line printed on the opposite side of the printed circuit board. The microstrip line can be hook shaped and intersect each of the slots. The non linear slots can be radially arranged around a locus or area on the circuit board. A metal patch can placed above the ground plane and electromagnetic waves emanating from the microstrip line can couple to the patch through the non-linear strips and excite the patch such that it radiates an electromagnetic transmission.Type: GrantFiled: December 9, 2014Date of Patent: November 14, 2017Assignee: CITY UNIVERSITY OF HONG KONGInventors: Hau Wah Lai, Ka Ming Mak, Kwai Man Luk, Chi Hou Chan