Title :
Low-profile helical array antenna fed from a radial waveguide
Author :
Nakano, Hisamatsu ; Takeda, Haruo ; Kitamura, Yorihiro ; Mimaki, Hiroaki ; Yamauchi, Junji
Author_Institution :
Coll. of Eng., Hosei Univ., Tokyo, Japan
fDate :
3/1/1992 12:00:00 AM
Abstract :
A low-profile array antenna composed of two-turn 4° pitch angle helices is designed for a frequency band of 11.7 GHz to 12.0 GHz. The feed wire of each helix is inserted into a radial waveguide through a small hole and excited by a traveling wave flowing in the transverse electromagnetic mode between the two parallel plates of the waveguide. The measured aperture efficiency shows a maximum value of 77% for a beam radiated in the normal direction and 69% for a 30° beam tilt
Keywords :
antenna feeders; antenna radiation patterns; antenna travelling wave arrays; microwave antenna arrays; 11.7 to 12.0 GHz; 69 percent; 77 percent; SHF; TEM mode; aperture efficiency; feed wire; helical array antenna; low-profile array antenna; radial waveguide; transverse electromagnetic mode; traveling wave; Antenna arrays; Apertures; Electromagnetic measurements; Electromagnetic radiation; Electromagnetic scattering; Electromagnetic waveguides; Feeds; Frequency; Helical antennas; Wire;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
