Title :
A conformal spiral array antenna radiating an omnidirectional circularly-polarized wave
Author :
Nakayama, I. ; Kawano, T. ; Nakano, H.
Author_Institution :
Coll. of Eng., Hosei Univ., Koganei, Japan
Abstract :
A conformal spiral antenna above a finite-length conducting cylinder has been numerically analyzed using the method of moments (MoM). In this paper, spiral elements are arrayed above a conducting cylinder. The radiation characteristics of the array are evaluated with emphasis on the radiation patterns. The formation of an omnidirectional radiation pattern is discussed. The mutual coupling among spiral elements is investigated. The radiation patterns calculated by the MoM are compared with those calculated by the pattern multiplication method (PMM). The limitations of the PMM calculation are revealed.
Keywords :
antenna arrays; antenna radiation patterns; conformal antennas; electric impedance; electromagnetic coupling; electromagnetic wave polarisation; method of moments; spiral antennas; MoM; conformal spiral array antenna; finite-length conducting cylinder; input impedance; method of moments; mutual coupling; omnidirectional circularly-polarized wave radiation; omnidirectional radiation pattern; pattern multiplication method; radiation characteristics; spiral elements; Antenna arrays; Antenna radiation patterns; Coplanar waveguides; Engine cylinders; Impedance; Laboratories; Message-oriented middleware; Mutual coupling; Polarization; Spirals;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1999. IEEE
Conference_Location :
Orlando, FL, USA
Print_ISBN :
0-7803-5639-x
DOI :
10.1109/APS.1999.789456
