TY - JOUR
T1 - Square spiral antenna on dielectric half-space
T2 - Analysis using an electric field equation formulated by a finite-difference technique
AU - Nakano, H.
AU - Hirose, K.
AU - Yamazaki, M.
AU - Yamauchi, J.
PY - 1998
Y1 - 1998
N2 - A tangential electric field equation for a wire antenna on a dielectric half-space of relative permittivity εr is formulated using a finite-difference technique. This equation involves only single-integral calculations and is used to obtain the current distribution of a square spiral antenna. The validity of the current obtained is checked by FD-TD analysis. Based on the current distribution obtained, the radiation characteristics of the spiral are evaluated. It is found that the gain in the dielectric material is larger than that in free space, with a ratio of εr1.5 in the broadside directions. As εr increases, the circularly polarised radiation region bounded by the critical angles in the dielectric becomes narrower and the resistance value of the input impedance becomes lower.
AB - A tangential electric field equation for a wire antenna on a dielectric half-space of relative permittivity εr is formulated using a finite-difference technique. This equation involves only single-integral calculations and is used to obtain the current distribution of a square spiral antenna. The validity of the current obtained is checked by FD-TD analysis. Based on the current distribution obtained, the radiation characteristics of the spiral are evaluated. It is found that the gain in the dielectric material is larger than that in free space, with a ratio of εr1.5 in the broadside directions. As εr increases, the circularly polarised radiation region bounded by the critical angles in the dielectric becomes narrower and the resistance value of the input impedance becomes lower.
KW - Finite-difference technique
KW - Spiral antennas
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U2 - 10.1049/ip-map:19981446
DO - 10.1049/ip-map:19981446
M3 - Article
AN - SCOPUS:0031997178
VL - 145
SP - 70
EP - 74
JO - IEE Proceedings: Microwaves, Antennas and Propagation
JF - IEE Proceedings: Microwaves, Antennas and Propagation
SN - 1350-2417
IS - 1
ER -