A two-wire spiral antenna backed by a plane reflector with an unbalanced feed system

Kazuhide Hirose, Masamitsu Miyamoto, Hisamatsu Nakano

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A novel unbalanced feed system, which achieves quasi-antiphase excitation without a balun circuit, is proposed for a two-wire spiral antenna backed by a conducting plane reflector. An inner spiral-wire end is fed from a coaxial line and the other inner spiral-wire end is short-circuited to the reflector. The antenna is analyzed using the method of moments. The radiation characteristics are found to be comparable to those of a conventional spiral antenna with antiphase excitation. The frequency bandwidth for a 3-dB axial-ratio criterion is 18% (20% for antiphase excitation), with a gain of approximately 8 dBi (8 dBi for antiphase excitation). The input impedance is almost constant at 170 - j30 ohms.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalElectronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)
Volume86
Issue number4
DOIs
Publication statusPublished - 2003 Apr
Externally publishedYes

Fingerprint

Spiral antennas
Wire
Method of moments
Antennas
Bandwidth
Radiation
Networks (circuits)

Keywords

  • Balun
  • Circularly polarized antenna
  • Method of moments
  • Spiral antenna
  • Wideband antenna

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Cite this

@article{6213acb86a684fd9b214ae834631e8ad,
title = "A two-wire spiral antenna backed by a plane reflector with an unbalanced feed system",
abstract = "A novel unbalanced feed system, which achieves quasi-antiphase excitation without a balun circuit, is proposed for a two-wire spiral antenna backed by a conducting plane reflector. An inner spiral-wire end is fed from a coaxial line and the other inner spiral-wire end is short-circuited to the reflector. The antenna is analyzed using the method of moments. The radiation characteristics are found to be comparable to those of a conventional spiral antenna with antiphase excitation. The frequency bandwidth for a 3-dB axial-ratio criterion is 18{\%} (20{\%} for antiphase excitation), with a gain of approximately 8 dBi (8 dBi for antiphase excitation). The input impedance is almost constant at 170 - j30 ohms.",
keywords = "Balun, Circularly polarized antenna, Method of moments, Spiral antenna, Wideband antenna",
author = "Kazuhide Hirose and Masamitsu Miyamoto and Hisamatsu Nakano",
year = "2003",
month = "4",
doi = "10.1002/ecja.10079",
language = "English",
volume = "86",
pages = "1--9",
journal = "Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)",
issn = "8756-6621",
publisher = "John Wiley and Sons Inc.",
number = "4",

}

TY - JOUR

T1 - A two-wire spiral antenna backed by a plane reflector with an unbalanced feed system

AU - Hirose, Kazuhide

AU - Miyamoto, Masamitsu

AU - Nakano, Hisamatsu

PY - 2003/4

Y1 - 2003/4

N2 - A novel unbalanced feed system, which achieves quasi-antiphase excitation without a balun circuit, is proposed for a two-wire spiral antenna backed by a conducting plane reflector. An inner spiral-wire end is fed from a coaxial line and the other inner spiral-wire end is short-circuited to the reflector. The antenna is analyzed using the method of moments. The radiation characteristics are found to be comparable to those of a conventional spiral antenna with antiphase excitation. The frequency bandwidth for a 3-dB axial-ratio criterion is 18% (20% for antiphase excitation), with a gain of approximately 8 dBi (8 dBi for antiphase excitation). The input impedance is almost constant at 170 - j30 ohms.

AB - A novel unbalanced feed system, which achieves quasi-antiphase excitation without a balun circuit, is proposed for a two-wire spiral antenna backed by a conducting plane reflector. An inner spiral-wire end is fed from a coaxial line and the other inner spiral-wire end is short-circuited to the reflector. The antenna is analyzed using the method of moments. The radiation characteristics are found to be comparable to those of a conventional spiral antenna with antiphase excitation. The frequency bandwidth for a 3-dB axial-ratio criterion is 18% (20% for antiphase excitation), with a gain of approximately 8 dBi (8 dBi for antiphase excitation). The input impedance is almost constant at 170 - j30 ohms.

KW - Balun

KW - Circularly polarized antenna

KW - Method of moments

KW - Spiral antenna

KW - Wideband antenna

UR - http://www.scopus.com/inward/record.url?scp=0037379594&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037379594&partnerID=8YFLogxK

U2 - 10.1002/ecja.10079

DO - 10.1002/ecja.10079

M3 - Article

VL - 86

SP - 1

EP - 9

JO - Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)

JF - Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)

SN - 8756-6621

IS - 4

ER -