Takafumi KAI


A Cost-Effective Transition between a Microstrip Line and a Post-Wall Waveguide Using a Laminated LTCC Substrate in 60-GHz Band
Takafumi KAI Jiro HIROKAWA Makoto ANDO Hiroshi NAKANO Yasutake HIRACHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/04/01
Vol. E90-C  No. 4  pp. 907-910
Type of Manuscript:  LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
coaxialpost-wall waveguidemicrostrip linemillimeter-wave bandLTCC
 Summary | Full Text:PDF(914.1KB)

Moment Method Analysis of a Plane Wave Generator in an Oversized Rectangular Waveguide
Takafumi KAI Jiro HIROKAWA Makoto ANDO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/01/01
Vol. E90-B  No. 1  pp. 105-113
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
millimeter-waveplane wave generatoroversized rectangular waveguidemoment methodeigenmode
 Summary | Full Text:PDF(842.2KB)

A Coaxial Line to Post-Wall Waveguide Transition for a Cost-Effective Transformer between a RF-Device and a Planar Slot-Array Antenna in 60-GHz Band
Takafumi KAI Yusuke KATOU Jiro HIROKAWA Makoto ANDO Hiroshi NAKANO Yasutake HIRACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/05/01
Vol. E89-B  No. 5  pp. 1646-1653
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
home-link systemcoaxialpost-wall waveguidemillimeter-wave bandPTFE
 Summary | Full Text:PDF(1MB)

Feed through an Aperture to a Post-Wall Waveguide with Step Structure
Takafumi KAI Jiro HIROKAWA Makoto ANDO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/03/01
Vol. E88-B  No. 3  pp. 1298-1302
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
post-wall waveguidemillimeter-wave bandsaperture
 Summary | Full Text:PDF(950KB)

A Transformer between a Thin Post-Wall Waveguide and a Standard Metal Waveguide via a Dielectric Substrate Insertion with Slits Etched on It
Takafumi KAI Jiro HIROKAWA Makoto ANDO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/01/01
Vol. E87-B  No. 1  pp. 200-203
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
millimeter-wave band transformervery thin post-wall waveguidedielectric substrate with slits etched on both edges
 Summary | Full Text:PDF(520.4KB)