Open AccessModified current distribution for analysis of spiral antennas
Author(s) -
JalaliDeel Ahmad,
Nayyeri Vahid,
Soleimani Mohammad,
Naghdehforushha SeyedArash
Publication year - 2017
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2017.0129
Subject(s) - current (fluid) , spiral (railway) , spiral antenna , azimuth , distribution (mathematics) , component (thermodynamics) , acoustics , physics , optics , radiation pattern , mathematics , computer science , mathematical analysis , telecommunications , antenna (radio) , coaxial antenna , thermodynamics
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.