Title :
A monofilar Archimedean spiral slot antenna fed by a triplate transmission line
Author :
Nakano, H. ; Nakayama, K. ; Hirose, K. ; Yamauchi, J.
Author_Institution :
Coll. of Eng., Hosei Univ., Tokyo, Japan
Abstract :
It is found that a monofilar spiral slot has an optimum arm length for radiation of a CPW. The spiral slot radiates a wide unidirectional beam, having half-power beam widths on the order of 90 degrees in the two principal planes. The bandwidths for a 3-dB axial ratio criterion and a -14-dB return loss criterion are 7.4% and 4.9%, respectively. Using spiral slots, a 4*4 array antenna is designed through optimization of the array elements. The array shows an antenna gain on the order of 19 dB within a 3.7% bandwidth.<>
Keywords :
antenna arrays; antenna feeders; antenna radiation patterns; electromagnetic wave polarisation; 19 dB; 3-dB axial ratio criterion; Archimedean spiral slot antenna; antenna feeder; antenna gain; arm length; array antenna; array elements; bandwidths; circularly polarised wave; half-power beam widths; monofilar spiral slot; principal planes; return loss; triplate transmission line; unidirectional beam; Antenna arrays; Antenna radiation patterns; Bandwidth; Coplanar waveguides; Feeds; Frequency; Slot antennas; Spirals; Stripline; Transmission line antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1991. AP-S. Digest
Conference_Location :
London, Ontario, Canada
Print_ISBN :
0-7803-0144-7
DOI :
10.1109/APS.1991.175040
