Title :
Two Types of Exciting Modes in a Rectangular-to-Radial Waveguide Transformer as a Feeder of Radial Line Slot Antennas
Author :
Sudo, Kaoru ; Hirokawa, Jiro ; Ando, Makoto
Author_Institution :
Tokyo Institute of Technology, Dept. of Electrical Electronic Engineering, 2-12- 1, O-okayama, Meguro-ku, Tokyo, 152-8552, Japan. Tel: + 81 3 5734 2563, E-mail: ksudo@antenna.ee.titech.ac.jp
Abstract :
The authors discuss two types of exciting modes in a rectangular-to-radial waveguide transformer for radial line slot antennas (RLSAs). One is the rotating-mode gene a crossed slot in a radial waveguide. The measured ripple of the amplitude is 3.0 dB in the ¿ -direction at 5.95 GHz and the bandwidth below 6 dB is 7.0% in the 5.8 GHz band. The other is the coaxial mode; which is proposed in this paper. The calculated ripple of the amplitude in the ¿ - direction is about 1.2 dB in the 12 GHz band.
Keywords :
Antenna feeds; Antenna measurements; Bandwidth; Coaxial components; Hollow waveguides; Rectangular waveguides; Rotation measurement; Slot antennas; Space power stations; Spirals;
Conference_Titel :
Microwave Conference, 2003 33rd European
Conference_Location :
Munich, Germany
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMA.2003.341116
