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 :
Dept. of Electr. Electron. Eng., Tokyo Inst. of Technol., Japan
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 φ-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 φ-direction is about 1.2 dB in the 12 GHz band.
Keywords :
antenna feeds; coaxial waveguides; rectangular waveguides; slot antennas; transformers; 1.2 dB; 12 GHz; 3.0 dB; 5.8 GHz; 5.95 GHz; RLSA; coaxial mode; exciting modes; radial line slot antennas; rectangular-radial waveguide transformer; rotating-mode gene; Antenna feeds; Antenna measurements; Bandwidth; Coaxial components; Message-oriented middleware; Millimeter wave technology; Rectangular waveguides; Slot antennas; Space power stations; Spirals;
Conference_Titel :
Microwave Conference, 2003. 33rd European
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMC.2003.1262805
