Title :
Characteristics of two-arm wire conical spiral antennas
Author :
Zainud-Deen, S.H. ; Soliman, N.F.M. ; Shaalan, A.A.M. ; Hussein, K. F A
Author_Institution :
Fac. of Electron. Eng., Menoufia Univ., Egypt
Abstract :
Conical Archimedes spiral antennas are designed to produce radiation patterns of cardoid or conical shapes for satellite applications. The method of moments is used to calculate the current distribution on the spiral arms. The radiation pattern, gain, polarization, and input impedance are presented. The standing-wave ratio (VSWR) and the reflection coefficient of the antenna are investigated over a wide frequency band. It is shown that the radiation pattern of this antenna can be easily shaped by setting the geometrical parameters of the conical spiral such as the cone angle and the spiral constant. It is noticed that the conical spiral antenna has a wide bandwidth over which the radiation characteristics and the input impedance are maintained satisfactory.
Keywords :
antenna radiation patterns; conical antennas; current distribution; electric impedance; method of moments; polarisation; satellite antennas; spiral antennas; wire antennas; VSWR; cardoid radiation patterns; cone angle; conical Archimedes spiral antennas; current distribution; input impedance; method of moments; polarization; reflection coefficient; satellite applications; spiral constant; standing-wave ratio; two-arm wire antenna; wide frequency band; Antenna radiation patterns; Arm; Current distribution; Impedance; Moment methods; Polarization; Satellite antennas; Shape; Spirals; Wire;
Conference_Titel :
Radio Science Conference, 2004. NRSC 2004. Proceedings of the Twenty-First National
Print_ISBN :
977-5031-77-X
DOI :
10.1109/NRSC.2004.1321794
