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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
Publication Date: 1996/01/25
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.