Modified current distribution for analysis of spiral antennas

Abstract

Circular current distribution is conventionally used to model current on spiral antennas. However, this model does not include the radial component of the current on the spiral arms. Therefore, it is valid only for the spiral antennas with very small values of the growth rate, where the radial component of the current is negligible. This study proposes a modified current distribution including both radial and azimuthal components of the current, hence, the modified model is not restricted to very small values of the growth rate. Using the modified current distribution, the radiation characteristics of spiral antennas with different growth rates are extracted. Validation is achieved by comparison of the results with those obtained by full wave numerical simulations.

Design of planar plate monopole antenna with vertical rectangular cross-sectional plates for ultra-wideband communications

“…During the recent years, broadband antennas covering a wide range of the frequency spectrum have found increasing applications. These antennas are particularly applied to high data rate wireless communications [1][2][3][4] with high quality of service requirements, such as multimedia transmission [5][6][7], real time navigation and tracking systems, photography and radars. The planar monopole antennas are well suited to broadband applications due to their wide impedance bandwidth, omnidirectional pattern with linear polarization, low cost and noncomplex shape.…”