Patents by Inventor Masayuki Miyaji

Masayuki Miyaji 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).

  • Patent number: 6300848
    Abstract: According to the configuration the present power splitter, it is possible to reduce the characteristic impedance of a transmission line constituting a directional coupler by setting the impedance of a first terminal pair constituted of an input port 7a and a second output port 7d of a 6-dB branch-line-shaped directional coupler 7 to a value smaller than a reference impedance Z0 (50 &OHgr; in general) and setting the impedance of a second terminal pair constituted of an isolation port 7b and a first output port 7c of the directional coupler 7 to Z0. Therefore, it is possible to increase the number of splits and reduce loss, as compared with conventional cases.
    Type: Grant
    Filed: September 1, 1999
    Date of Patent: October 9, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masayuki Miyaji, Kaoru Ishida, Hiroaki Kosugi, Shin'ichi Kugou
  • Publication number: 20010001548
    Abstract: A high power amplifier has a first balun propagating a half of an input signal to an in-phase output terminal, and also propagating a fourth of the input signal to first and second opposite-phase output terminals, the signal propagated to the first and second opposite-phase output terminals lagging 180 degrees behind the signal propagated to the in-phase output terminal; first and second power amplifier circuits connected to the first and second opposite-phase output terminals of the first balun and having the same characteristics; a third power amplifier circuit connected to the in-phase output terminal of the first balun and having output power substantially twice as much as the output power of the first or second power amplifier circuit; and a second balun having first and second opposite-phase input terminals for receiving the outputs of the first and second power amplifier circuits, having an in-phase input terminal for receiving the output of the third power amplifier circuit, combining the outputs of t
    Type: Application
    Filed: January 12, 2001
    Publication date: May 24, 2001
    Inventors: Kaoru Ishida, Masayuki Miyaji, Hiroaki Kosugi, Shin?apos;ichi Kugou
  • Patent number: 6201439
    Abstract: A high power amplifier has a first balun propagating a half of an input signal to an in-phase output terminal, and also propagating a fourth of the input signal to first and second opposite-phase output terminals, the signal propagated to the first and second opposite-phase output terminals lagging 180 degrees behind the signal propagated to the in-phase output terminal; first and second power amplifier circuits connected to the first and second opposite-phase output terminals of the first balun and having the same characteristics; a third power amplifier circuit connected to the in-phase output terminal of the first balun and having output power substantially twice as much as the output power of the first or second power amplifier circuit; and a second balun having first and second opposite-phase input terminals for receiving the outputs of the first and second power amplifier circuits, having an in-phase input terminal for receiving the output of the third power amplifier circuit, combining the outputs of t
    Type: Grant
    Filed: September 9, 1998
    Date of Patent: March 13, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kaoru Ishida, Masayuki Miyaji, Hiroaki Kosugi, Shin'ichi Kugou
  • Patent number: 6037837
    Abstract: A feed forward amplifier comprises a main amplifier 10 composed of a plurality of power amplifiers 8 and 9 combined in parallel. In addition to the plurality of power amplifiers, this feed forward amplifier includes a distortion detecting amplifier 25 for detecting the distortion components, having a distortion characteristic in a predetermined relationship with the distortion characteristic of the main amplifier. It also omits a distortion detecting power combiner 23 otherwise located after a main amplifier 10 and locates a delay circuit 21 before the main amplifier 10 to reduce losses occurring after the main amplifier 10 to improve the efficiency of the entire feed forward amplifier.
    Type: Grant
    Filed: February 8, 1999
    Date of Patent: March 14, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masayuki Miyaji, Kaoru Ishida, Hiroaki Kosugi, Shin'ichi Kugou
  • Patent number: 5973557
    Abstract: The invention presents a high efficiency linear power amplifier of plural frequency bands reduced in the number of parts and elements, simplified in the circuit construction, and saved in the circuit space, and in FIG. 1, signals entering from a common input terminal 1 in frequency bands A and B are matched in both frequency bands A and B in a wide band matching network 2, amplified in a pre-amplifier 3, put into a common terminal 4a of a switch circuit 4, and the signal in frequency band A is put into a changeover terminal 4b, matched in a matching network 5 and amplified in a post-amplifier 6, and its output is matched in a post-matching network 7 and sent out into an output terminal 8, while, similarly, the signal in frequency band B is put into other changeover terminal 4c of the switch circuit 4, matched in a matching network 9, amplified in a post-amplifier 10, and its output is matched in a post-matching network 11 and is sent out into an output terminal 12.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: October 26, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masayuki Miyaji, Kaoru Ishida, Hiroaki Kosugi, Yoichi Morinaga, Hidenobu Kato, Takashi Enoki