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

UR - http://www.scopus.com/inward/record.url?scp=0031997178&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031997178&partnerID=8YFLogxK

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 -