Inclined Slot Array Antennas on a Hollow Rectangular Coaxial Line

Satoshi YAMAGUCHI  Yukihiro TAHARA  Toru TAKAHASHI  Kazushi NISHIZAWA  Hiroaki MIYASHITA  Yoshihiko KONISHI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B   No.9   pp.2870-2877
Publication Date: 2012/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.2870
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
rectangular coaxial line,  waveguide,  slot array antenna,  inclined linear polarization,  

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Summary: 
Slotted-waveguide array antennas are attractive because of their low-loss characteristics at high frequencies. Several types of slotted arrays whose polarization angles are inclined to the waveguide axis have been reported. In this paper, we propose a new type of slot array antenna on a rectangular coaxial line for minimizing the waveguide width. As opposed to a conventional waveguide, there is no “cut-off” concept in our proposal because the coaxial line is a transverse electromagnetic (TEM) line. Therefore it is possible to guide the wave even if the diameter of the line is much smaller than that of the waveguide. Moreover, the proposed antenna is a resonant slot array antenna that is based on standing-wave excitation and is thus different from traveling-wave antennas (such as a leaky coaxial cable (LCX)).