A Radial Line Slot Antenna Fed by a Rectangular Waveguide through a Crossed Slot

Kaoru SUDO  Takuichi HIRANO  Jiro HIROKAWA  Makoto ANDO  

IEICE TRANSACTIONS on Communications   Vol.E86-B    No.10    pp.3063-3070
Publication Date: 2003/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antenna and Propagation
solar power satellite,  radial line slot antenna,  feeder,  crossed slot,  method of moments,  numerical eigenmode basis function,  

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A rectangular-to-radial waveguide transformer through a crossed slot is proposed as a feeder of a radial line slot antenna (RLSA) for use in a system of solar power satellite (SPS). The transformer is analyzed and designed by using the MoM with numerical eigenmode basis functions. The measured ripple of the amplitude is 3.0 dB in the φ-direction and a 7.0% frequency bandwidth for rotating mode with the ripple below 6 dB is obtained. This bandwidth is wider than that of conventional ring slot or cavity resonator with a coaxial feeder. The antenna measurements at 5.8 GHz show reasonable rotational symmetry both in the near-field distribution and the far field radiation patterns. The reflection is -27.7 dB at the design frequency and below -15 dB in the 7.0% bandwidth. The gain of the antenna with the diameter of 300 mm is 22.7 dBi and the efficiency is 56%.