Square spiral antenna on dielectric half-space: Analysis using an electric field equation formulated by a finite-difference technique

H. Nakano; K. Hirose; M. Yamazaki; J. Yamauchi

doi:10.1049/ip-map:19981446

Square spiral antenna on dielectric half-space: Analysis using an electric field equation formulated by a finite-difference technique

H. Nakano, K. Hirose, M. Yamazaki, J. Yamauchi

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

A tangential electric field equation for a wire antenna on a dielectric half-space of relative permittivity ε_r 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 ε_r^1.5 in the broadside directions. As ε_r 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.

Original language	English
Pages (from-to)	70-74
Number of pages	5
Journal	IEE Proceedings: Microwaves, Antennas and Propagation
Volume	145
Issue number	1
DOIs	https://doi.org/10.1049/ip-map:19981446
Publication status	Published - 1998
Externally published	Yes

Keywords

Finite-difference technique
Spiral antennas

ASJC Scopus subject areas

Computer Networks and Communications
Electrical and Electronic Engineering

Access to Document

10.1049/ip-map:19981446

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abstract = "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.",

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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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