Ken-ichi WATABE

Cryogenic Whispering Gallery Sapphire Oscillator for Microwave Frequency Standard Applications
Ken-ichi WATABE Yasuki KOGA Shin-ichi OHSHIMA Takeshi IKEGAMI John G. HARTNETT 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2004/09/01
Vol. E87-C  No. 9  pp. 1640-1642
Type of Manuscript:  LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
sapphire, whispering gallery mode, 4 K pulse-tube cryocooler, microwave oscillator, frequency stability, 
 Summary | Full Text:PDF
Tunable Double-Sapphire-Loaded Microwave Cavity with High-Q Factor
Ken-ichi WATABE Shin-ichi OHSHIMA Takeshi IKEGAMI John G. HARTNETT 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/07/01
Vol. E86-C  No. 7  pp. 1393-1395
Type of Manuscript:  LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
frequency-tuning method, microwave, double-sapphire-loaded cavity, whispering gallery mode, 
 Summary | Full Text:PDF
Characteristics of Optical Propagation through Rain for Infrared Space Communications
Ken-ichi WATABE Makoto AKIBA Norihisa HIROMOTO Takeshi HAYASHI Kazuhiko WAKAMORI Yoshiyuki TAKABE Yoichi CHIGAI Shigeo ITO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/02/01
Vol. E86-B  No. 2  pp. 862-864
Type of Manuscript:  LETTER
Category: Optical Wireless Communications
Keyword: 
optical propagation, atmosphere, BER, scintillation index, 
 Summary | Full Text:PDF