A Rotating Mode Radial Line Slot Antenna Fed by a Cavity Resonator

Seiji HOSONO  Jiro HIROKAWA  Makoto ANDO  Naohisa GOTO  Hiroyuki ARAI  

IEICE TRANSACTIONS on Communications   Vol.E78-B   No.3   pp.407-413
Publication Date: 1995/03/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
RLSA,  rotational symmetry,  concentric array,  rotating mode,  cavity resonator,  

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A radial line slot antenna (RLSA) is a high gain and high efficiency planar antenna proposed for DBS subscribers. Spirally arrayed slots are excited by a cylindrical wave with the rotational symmetry. In a small sized antenna where large slot coupling is adopted, aperture efficiency reduction due to rotational asymmetry associated with a spiral arrangement of the slots becomes notable. Authors proposed a RLSA with a concentric slot arrangement excited by a rotating mode in order to enhance the rotational symmetry. This is the first report of the normal operation of a rotating mode RLSA fed by a cavity resonator. The experiments confirm the basic operation of this novel antenna; the gain of 27.8dBi and the efficiency of 68% is measured at 11.85GHz for the RLSA with 0.24mφ.