Title :
Helical antennas with nonuniform helix diameter
Author :
Elkamchouchi, Hassan M. ; Salem, Ahmed I.
Abstract :
On this paper the helical antenna is considered with different helix diameters, uniform, linear, exponential and logarithmic diameter variations are considered. In each case, the radiation fields in the principal planes, the gains, axial ratio and current distributions are obtained. Also the input impedance is calculated as the frequency varies around the design values for each case. In all cases the pitch is taken constant. The numerical evaluations indicate that the exponential helix gives better performance
Keywords :
UHF antennas; VHF antennas; antenna radiation patterns; current distribution; electric impedance; helical antennas; 300 MHz; axial ratio; current distributions; exponential diameter variations; gain; helical antennas; input impedance; linear diameter variations; logarithmic diameter variations; nonuniform helix diameter; performance; principal plane; radiation fields; uniform diameter variations; Frequency; Helical antennas;
Conference_Titel :
Radio Science Conference, 2001. NRSC 2001. Proceedings of the Eighteenth National
Conference_Location :
Mansoura
Print_ISBN :
977-5031-68-0
DOI :
10.1109/NRSC.2001.929187
