1
Kenji Sekine, Hiroji Yamada, Matsuo Yamasaki, Osamu Kagaya, Kiichi Yamashita: Multi-chip module structure having conductive blocks to provide electrical connection between conductors on first and second sides of a conductive base substrate. Hitachi, Antonelli Terry Stout & Kraus, December 17, 2002: US06495914 (225 worldwide citation)

A metal base substrate for mounting a plurality of bare semiconductor chip devices thereon has first and second main surfaces. The first main surface has formed thereon at least one projection, and at least two recesses in which the bare semiconductor chip devices are to be mounted. The depth of the ...


2
Toru Fujioka, Isao Yoshida, Mineo Katsueda, Masatoshi Morikawa, Yoshikuni Matsunaga, Kenji Sekine, Osamu Kagaya: Mobile telephone apparatus. Renesas Technology, Mattingly Stanger Malur & Brundidge P C, March 8, 2005: US06865399 (72 worldwide citation)

In a mobile telephone apparatus corresponding to dual-band provided with an RF power module to operate in two kinds of different frequencies, a common harmonics control circuit is provided to the output circuit of such RF power module to realize higher efficiency in view of controlling respective ha ...


3
Ken Takei, Kenji Sekine: RF amplifier with plural combiners. Hitachi, Antonelli Terry Stout & Kraus, May 7, 2002: US06384680 (72 worldwide citation)

The present invention aims to provide a RF amplifier capable of controlling the generation of spurious signals when plural carriers are simultaneously amplified. The RF amplifier includes dividers for respectively dividing each of a plurality of input signals different in frequency of carrier from o ...


4
Ken Takei, Kenji Sekine: Multi-carrier RF amplifiers. Hitachi, Antonelli Terry Stout & Kraus, June 15, 2004: US06750707 (67 worldwide citation)

Apparatus including input ports for inputting a plurality of input signals different in frequency of carrier from one another, dividers for respectively dividing each of the plurality of input signals inputted to the input ports into plural form, and phase shifters for respectively assigning a weigh ...


5
Masami Ohnishi, Hidetoshi Matsumoto, Tomonori Tanoue, Osamu Kagaya, Kenji Sekine: Radio frequency power amplifier. Renesas Technology, Reed Smith, Stanley P Fisher Esq, Juan Carlos A Marquez Esq, September 13, 2005: US06943624 (50 worldwide citation)

The present invention provides a radio frequency power amplifier which may not introduce radio frequency loss during switching power amplifier units between high and low output power levels. By connecting a first-stage matching network M12 and first-stage matching network M13 to respective output no ...


6
Kenji Sekine, Hiroshi Kondoh, Keigo Kamozaki, Hideyuki Nagaishi, Kazuo Matsuura, Terumi Nakazawa, Michio Tanimoto, Hideaki Sasaki, Yuzo Taniguchi: High-frequency transmitter-receiver apparatus for such an application as vehicle-onboard radar system. Hitachi, Antonelli Terry Stout & Kraus, June 19, 2001: US06249242 (44 worldwide citation)

A high-frequency transmitter-receiver apparatus includes a transceiver circuit realized in a planar structure by a dielectric substrate and a semiconductor chip and a planar antenna formed on a dielectric substrate are provided on front and rear surfaces, respectively, of a single electrically condu ...


7
Toru Fujioka, Isao Yoshida, Mineo Katsueda, Masatoshi Morikawa, Yoshikuni Matsunaga, Kenji Sekine, Osamu Kagaya: High-frequency power amplifier module. Hitachi, Mattingly Stanger & Malur P C, May 7, 2002: US06384688 (39 worldwide citation)

A radio frequency power amplifier module for a dual-band type mobile communication apparatus that can transmit and receive the first frequency f


8
Toru Fujioka, Isao Yoshida, Mineo Katsueda, Masatoshi Morikawa, Yoshikuni Matsunaga, Kenji Sekine, Osamu Kagaya: Mobile telephone system. Hitachi, Mattingly Stanger & Malur P C, April 2, 2002: US06366788 (34 worldwide citation)

In a mobile telephone apparatus corresponding to dual-band provided with an RF power module to operate in two kinds of different frequencies, a common harmonics control circuit is provided to the output circuit of such RF power module to realize higher efficiency in view of controlling respective ha ...


9
Kenji Sekine, Masami Ohnishi, Haruhiko Funaki, Nobuo Masuda, Akio Iso: High-frequency power amplifier. Hitachi, Space Communications Research Corporation, Antonelli Terry Stout & Kraus, December 28, 1993: US05274341 (32 worldwide citation)

A high-frequency power amplifier comprises a pair of FETs, a divider which supplies opposite-phase versions of a signal to be amplified to the FETs, distributed-parameter transmission lines connected respectively at one ends thereof to output electrodes of the FETs, and a combiner which combines sig ...


10
Yukitsugu Hirota, Akira Endo, Katsuhiro Kimura, Hiroshi Morozumi, Kenji Sekine: Doppler radar mounting structure for motor vehicles. Hitachi, Nissan Motor, Craig and Antonelli, August 31, 1982: US04346774 (28 worldwide citation)

A Doppler radar speed sensor including an antenna section and a sensor section is mounted on the underside of the automobile undercarriage. A recess for accommodating the Doppler radar speed sensor is formed in part of the underside of the automobile undercarriage within a rectangle surrounded by th ...