Title :
A spiral antenna array using a triplate transmission line with circular apertures
Author :
Nakano, H. ; Hirokawa, G. ; Yamauchi, J. ; Hirose, K.
Author_Institution :
Coll. of Eng., Hosei Univ., Tokyo, Japan
Abstract :
Three types of spiral antennas constructed from a triplate transmission line are investigated for use as an array antenna element. The radiation characteristics were measured over a frequency band of 11.5 GHz to 12.2 GHz. Based on the investigation, an array antenna consisting of four spiral antennas was fabricated. The array shows a gain of 13.7 dB with a radiation efficiency of 73%. The bandwidth for a 3-dB axial ratio criterion is 2.6%, over which the return loss is observed to be less than -14 dB.<>
Keywords :
microwave antenna arrays; transmission lines; -14 dB; 11.5 to 12.2 GHz; 13.7 dB; 3-dB axial ratio; 73 percent; array antenna element; bandwidth; circular apertures; gain; radiation efficiency; return loss; spiral antenna array; triplate transmission line; Antenna arrays; Antenna measurements; Antenna radiation patterns; Aperture antennas; Coplanar transmission lines; Coplanar waveguides; Frequency response; Spirals; Transmission line antennas; Transmission line measurements;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1992. AP-S. 1992 Digest. Held in Conjuction with: URSI Radio Science Meeting and Nuclear EMP Meeting., IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-0730-5
DOI :
10.1109/APS.1992.221979
