Akifumi KASAMATSU


300-GHz-Band OFDM Video Transmission with CMOS TX/RX Modules and 40dBi Cassegrain Antenna toward 6G
Yohei MORISHITA Sangyeop LEE Toshihiro TERAOKA Ruibing DONG Yuichi KASHINO Hitoshi ASANO Shinsuke HARA Kyoya TAKANO Kosuke KATAYAMA Takenori SAKAMOTO Naganori SHIRAKATA Koji TAKINAMI Kazuaki TAKAHASHI Akifumi KASAMATSU Takeshi YOSHIDA Shuhei AMAKAWA Minoru FUJISHIMA 
Publication:   
Publication Date: 2021/10/01
Vol. E104-C  No. 10  pp. 576-586
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
6GTHz300GHzCassegrain antennaOFDMCMOStransmitterreceivermodule
 Summary | Full Text:PDF(4MB)

Transmission Characteristics Control of 120 GHz-Band Bandstop Filter by Coupling Alignment-Free Lattice Pattern
Akihiko HIRATA Koichiro ITAKURA Taiki HIGASHIMOTO Yuta UEMURA Tadao NAGATSUMA Takashi TOMURA Jiro HIROKAWA Norihiko SEKINE Issei WATANABE Akifumi KASAMATSU 
Publication:   
Publication Date: 2021/10/01
Vol. E104-C  No. 10  pp. 587-595
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
terahertzfilterwireless communicationclose-proximity wireless link
 Summary | Full Text:PDF(2.4MB)

Control of 120-GHz-Band Split Ring Resonator Filter by Coupling Lattice Pattern Substrate
Koichiro ITAKURA Akihiko HIRATA Masato SONODA Taiki HIGASHIMOTO Tadao NAGATSUMA Takashi TOMURA Jiro HIROKAWA Norihiko SEKINE Issei WATANABE Akifumi KASAMATSU 
Publication:   
Publication Date: 2021/03/01
Vol. E104-C  No. 3  pp. 102-111
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
millimeter-wave filtermillimeter-wave propagationmillimeter-wave communication
 Summary | Full Text:PDF(2.5MB)

32-Gbit/s CMOS Receivers in 300-GHz Band
Shinsuke HARA Kosuke KATAYAMA Kyoya TAKANO Ruibing DONG Issei WATANABE Norihiko SEKINE Akifumi KASAMATSU Takeshi YOSHIDA Shuhei AMAKAWA Minoru FUJISHIMA 
Publication:   
Publication Date: 2018/07/01
Vol. E101-C  No. 7  pp. 464-471
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Their Application Technologies)
Category: 
Keyword: 
ReceiverCMOS integrated circuitsterahertzfrequency conversion mixersfrequency multipliersamplifiersquadrature amplitude modulation
 Summary | Full Text:PDF(3MB)

Compact 141-GHz Differential Amplifier with 20-dB Peak Gain and 22-GHz 3-dB Bandwidth
Shinsuke HARA Kosuke KATAYAMA Kyoya TAKANO Issei WATANABE Norihiko SEKINE Akifumi KASAMATSU Takeshi YOSHIDA Shuhei AMAKAWA Minoru FUJISHIMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/10/01
Vol. E99-C  No. 10  pp. 1156-1163
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
millimeter wave circuitsCMOS processamplifiersfrequency estimation
 Summary | Full Text:PDF(1.4MB)

Impact of Mode Filtering on the Performance of Femtosecond Pulse Amplification in a Large Mode Area Fiber
Junichi HAMAZAKI Housei MOGI Norihiko SEKINE Satoshi ASHIHARA Akifumi KASAMATSU Iwao HOSAKO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/09/01
Vol. E98-C  No. 9  pp. 928-933
Type of Manuscript:  PAPER
Category: Optoelectronics
Keyword: 
fiber amplifierultra-short pulseYb-doped fiberdouble-clad fibermode filtering
 Summary | Full Text:PDF(793.7KB)

Generation of Arbitrarily Patterned Pulse Trains in the THz Range by Spectral Synthesis of Optical Combs
Isao MOROHASHI Takahide SAKAMOTO Norihiko SEKINE Tetsuya KAWANISHI Akifumi KASAMATSU Iwao HOSAKO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/08/01
Vol. E98-C  No. 8  pp. 793-798
Type of Manuscript:  Special Section PAPER (Special Section on Microwave Photonics)
Category: MWP Subsystem
Keyword: 
optical combMach-Zehnder modulatorterahertzultra-wideband
 Summary | Full Text:PDF(840.3KB)

RF-CMOS Implementation of UWB Transceivers and Its Application to Video Transmission
Akifumi KASAMATSU Akio TANAKA Hiroshi KODAMA Satoru TANOI Yasuhiro KAIZAKI Juichi NAKADA Masami HAGIO Yoshiaki KURAISHI Keren LI Hitoshi UTAGAWA Toshiaki MATSUI Ryuji KOHNO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/09/01
Vol. E88-A  No. 9  pp. 2279-2286
Type of Manuscript:  Special Section PAPER (Special Section on Ultra Wideband Systems)
Category: Hardware
Keyword: 
UWBimplementationCMOSMMICvideo
 Summary | Full Text:PDF(1.3MB)