A Millimeter-Wave Radial Line Slot Antenna Fed by a Rectangular Waveguide through a Ring Slot

Kaoru SUDO  Akira AKIYAMA  Jiro HIROKAWA  Makoto ANDO  

IEICE TRANSACTIONS on Electronics   Vol.E84-C   No.10   pp.1521-1527
Publication Date: 2001/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Millimeter-Wave Circuits and Fabrication Technologies Opening up the 21st Century)
planer antenna for 38 GHz band FWA,  radial line slot antenna-rectangular/circular waveguide transformer,  circular polarization,  rotation electric mode,  

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Rectangular/circular-to-radial waveguide tra-nsformers through a ring slot have been proposed for the feeder of radial line slot antennas (RLSAs) in millimeter wave application. Rotating electric modes are excited by a set of ring slot and perturbation dog bone slot. Basic operation is observed in 12 GHz band. Concentric array radial line slot antennas fed by these transformers are fabricated and the antenna gain of 26.9 dBi with the efficiency more than 60% is measured. The applicability for millimeter wave is verified for 38 GHz band RLSA fed by the rectangular waveguide. The measured gain of the antenna is 22.5 dBi with the efficiency of 53% with the diameter of 46mm and 26.4 dBi with 61% with the diameter of 66mm.