Browsing by Author "Nishikawa, T."

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A novel broadband leaky-wave antenna fed with composite right/left handed transmission line
(2007)
Miyama, Y.
;
Uda, S.
;
Lin, L. -C.
;
Nishikawa, T.
;
Wakino, K.
Determination of Complex Permittivity of Columnar Materials with Arbitrarily-Shaped Cross Section in Rectangular Waveguide
(2007)
Miyagawa, R.
;
Nishikawa, T.
;
Wakino, K.
;
Lin, Yu-De
;
Kitanwa, T.
The extended spectral domain approach combined with the mode-matching method (ESDMM) is applied to analyze the scattering characteristics of lossy dielectric post with arbitrarily-shaped cross section in the rectangular waveguide. ESDMM is accurate and efficient, and it is suitable for the iterative fitting to estimate the material characteristics. An effective evaluation method is proposed for the complex permittivity of the lossy dielectric post placed in the rectangular waveguide based on ESDMM The sample preparation and setting become much easier than those for the conventional methods. Complex permittivity of lossy dielectric sample with non-rectangular cross section is evaluated by this procedure and the measured results show good agreement with ones measured by conventional method over the X-band.
Space-wave leakage of strip lines on circular substrate
(2006)
Miyagawa, H.
;
Nishikawa, T.
;
Wakino, K.
;
Hong, W.
;
Lin, Y. -D
The space-wave leakage of strip lines on circular substrate is analyzed for the first time. The circular curved single-conductor strip structure has the broader bandwidth of the space-wave radiation than planar structure and is less affected by the surface wave leakage. This structure is suitable for the leaky-wave antennas for wireless broad-band communication applications.