Patents by Inventor Chien-Hua Ma
Chien-Hua Ma 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: 8761688Abstract: A radio frequency circuit and a signal transmission method are provided. The radio frequency circuit comprises a primary antenna, a secondary antenna and a radio frequency integrated circuit. The primary antenna is electrically coupled to the radio frequency integrated circuit to transmit and receive at least one transmission/reception signal. The secondary antenna is electrically coupled to the radio frequency integrated circuit to receive at least one diversity reception signal. The radio frequency integrated circuit is configured to receive a specific diversity reception signal via the primary antenna and to transmit and receive a specific transmission/reception signal via the secondary antenna.Type: GrantFiled: June 8, 2011Date of Patent: June 24, 2014Assignee: HTC CorporationInventors: Wei-Yang Wu, Wei-Chien Chen, Chien-Hua Ma
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Patent number: 8542157Abstract: An antenna module includes an antenna, a tunable matching circuit, a power detector and a control unit. The antenna comprises a feeding point. The tunable matching circuit, electrically connected between the antenna and the power detector and configured to provide a loading impedance, comprises a plurality of tunable impedance elements connected to each other and electrically connected to the feeding point as well. The power detector is electrically connected between the tunable matching circuit and a power amplifier and configured to detect a power indicator. The control unit, electrically connected to the tunable matching circuit and the power detector, is configured to read the power indicator and RSSI to generate a control signal for the tunable matching circuit, which consistently changes the loading impedance to achieve impedance matching.Type: GrantFiled: April 25, 2011Date of Patent: September 24, 2013Assignee: HTC CorporationInventors: Wei-Yang Wu, Chien-Hua Ma, Yen-Chuan Lin
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Publication number: 20120315861Abstract: A radio frequency circuit and a signal transmission method are provided. The radio frequency circuit comprises a primary antenna, a secondary antenna and a radio frequency integrated circuit. The primary antenna is electrically coupled to the radio frequency integrated circuit to transmit and receive at least one transmission/reception signal. The secondary antenna is electrically coupled to the radio frequency integrated circuit to receive at least one diversity reception signal. The radio frequency integrated circuit is configured to receive a specific diversity reception signal via the primary antenna and to transmit and receive a specific transmission/reception signal via the secondary antenna.Type: ApplicationFiled: June 8, 2011Publication date: December 13, 2012Applicant: HTC CORPORATIONInventors: Wei-Yang WU, Wei-Chien CHEN, Chien-Hua MA
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Publication number: 20120075160Abstract: An antenna module includes an antenna, a tunable matching circuit, a power detector and a control unit. The antenna comprises a feeding point. The tunable matching circuit, electrically connected between the antenna and the power detector and configured to provide a loading impedance, comprises a plurality of tunable impedance elements connected to each other and electrically connected to the feeding point as well. The power detector is electrically connected between the tunable matching circuit and a power amplifier and configured to detect a power indicator. The control unit, electrically connected to the tunable matching circuit and the power detector, is configured to read the power indicator and RSSI to generate a control signal for the tunable matching circuit, which consistently changes the loading impedance to achieve impedance matching.Type: ApplicationFiled: April 25, 2011Publication date: March 29, 2012Applicant: HTC CORPORATIONInventors: Wei-Yang WU, Chien-Hua MA, Yen-Chuan Lin
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Publication number: 20120050122Abstract: An antenna module and an impedance matching method thereof are provided. The antenna module includes an antenna piece, a tunable matching circuit and a control unit. The antenna piece has a feeding point. The tunable matching circuit, electrically connected to the feeding point and configured to provide a loading impedance, has an inductor, a first tunable capacitor and a second tunable capacitor. One end of the first tunable capacitor is electrically connected to one end of the inductor; and one end of the second tunable capacitor is electrically connected to another end of the first tunable capacitor and the feeding point, and another end of the second tunable capacitor is electrically connected to a system ground. The control unit is electrically connected to the matching circuit and configured to load an operation frequency so as to generate a control signal for adaptively modulating the values of the first and the second tunable capacitance.Type: ApplicationFiled: March 14, 2011Publication date: March 1, 2012Applicant: HTC CORPORATIONInventors: Wei-Yang WU, Chien-Hua MA, Yen-Chuan Lin
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Patent number: 6907263Abstract: An antenna architecture permitting tri-band and quad-band transmission and reception of GSM standardized frequencies in a mobile unit with a required gain without increasing power consumption. The mobile unit utilizes a control circuit to unify a first antenna and a second antenna, wherein the first antenna can operate in a first frequency and a second frequency and the second antenna can operate in a third frequency and a forth frequency. The control circuit includes a phase shift circuit for each antenna. The phase shift circuits prevent each antenna from loading the other antenna effectively eliminating excessive VSWR to increase gain.Type: GrantFiled: February 19, 2003Date of Patent: June 14, 2005Assignee: High Tech Computer Corp.Inventors: Chien-Hsun Ho, Yih-Jang Chen, Kuo-Cheng Chen, Chien-Hua Ma
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Publication number: 20040246182Abstract: An antenna for wireless communication includes a radiator for receiving and transmitting radio frequency (RF) signals comprising a plurality of recesses formed on the sides of the radiator, a feeding plate stretching out from the radiator for transmitting the RF signals, and a ground plate stretching out from the radiator for grounding.Type: ApplicationFiled: September 1, 2003Publication date: December 9, 2004Inventors: Kuo-Cheng Chen, Hui-Feng Lee, Chien-Hua Ma
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Publication number: 20040207557Abstract: An antenna connected to a board includes a radiator perpendicular to the circuit board for transmitting and receiving radio frequency signals, a feeding plate stretching out from the radiator and connected to a feed pad on the circuit board for transmitting radio frequency signals, and a ground plate stretching out from the radiator, which is connected to a ground plane on the circuit board.Type: ApplicationFiled: August 6, 2003Publication date: October 21, 2004Inventors: Kuo-Cheng Chen, Hui-Feng Lee, Chien-Hua Ma
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Publication number: 20040204007Abstract: An antenna architecture permitting tri-band and quad-band transmission and reception of GSM standardized frequencies in a mobile unit with a required gain without increasing power consumption. The mobile unit utilizes a control circuit to unify a first antenna and a second antenna, wherein the first antenna can operate in a first frequency and a second frequency and the second antenna can operate in a third frequency and a forth frequency. The control circuit includes a phase shift circuit for each antenna. The phase shift circuits prevent each antenna from loading the other antenna effectively eliminating excessive VSWR to increase gain.Type: ApplicationFiled: February 19, 2003Publication date: October 14, 2004Inventors: Chien-Hsun Ho, Yih-Jang Chen, Kuo-Cheng Chen, Chien-Hua Ma