Slot Design of a Concentric Array Radial Line Slot Antenna with Matching Slot Pairs

Masao UENO  Seiji HOSONO  Masaharu TAKAHASHI  Kimio SAKURAI  Makoto ANDO  Naohisa GOTO  Yasuhiko YOSHIDA  

IEICE TRANSACTIONS on Communications   Vol.E79-B    No.1    pp.70-76
Publication Date: 1996/01/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
antennas,  array,  RLSA,  CA-RLSA,  matching slot pair,  

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A radial line slot antenna (RLSA) is a high efficiency and high gain planar antenna. The efficiency of RLSA becomes lower as the aperture size reduces due to rotational asymmetry of the illumination. A concentric array RLSA (CA-RLSA) was proposed to overcome this difficulty. It adopted three new techniques; (1) not spirally but concentrically arrayed slots, (2) a rotating mode feed circuit, (3) matching slot pairs eliminating termination loss. This paper proposes the basic slot design for (1) and (2) of CA-RLSA. Excellent characteristics of very small CA-RLSAs based upon this design are confirmed by measurements.