Monofilar Archimedean spiral slot antennas

Kazuhide Hirose, Kazuo Nakayama, Hisamatsu Nakano

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A monofilar Archimedean spiral is adopted as a circularly polarized slot radiator which is electromagnetically coupled to a feed line. Numerical analysis of the coupling between the slot and the feed line reveals that, when the slot arm length is properly chosen, a traveling-wave magnetic current is distributed along the slot, leading to the radiation of a circularly polarized wave. On the basis of this radiation mechanism, a spiral slot printed antenna fed by a triplate transmission line is experimentally designed to obtain a unidirectional radiation beam. It is found that an axial ratio of 0.6 dB isachieved, and that the spiral slot is matched to the transmission line with a VSWR of less than 1.5. An array antenna composed of 32 printed spiral slots is constructed, attaining a 5% bandwidth for a 3-dB axial ratio criterion. The formation of several tilted beams is also demonstrated.

Original languageEnglish
Pages (from-to)415-426
Number of pages12
JournalElectromagnetics
Volume14
Issue number3-4
Publication statusPublished - 1994 Jul
Externally publishedYes

Fingerprint

spiral antennas
Spiral antennas
slot antennas
Slot antennas
slots
Radiation
Electric lines
Antenna feeders
Radiators
Microstrip antennas
Antenna arrays
Numerical analysis
transmission lines
Bandwidth
antenna feeds
antenna arrays
radiators
radiation
traveling waves
numerical analysis

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Hirose, K., Nakayama, K., & Nakano, H. (1994). Monofilar Archimedean spiral slot antennas. Electromagnetics, 14(3-4), 415-426.

Monofilar Archimedean spiral slot antennas. / Hirose, Kazuhide; Nakayama, Kazuo; Nakano, Hisamatsu.

In: Electromagnetics, Vol. 14, No. 3-4, 07.1994, p. 415-426.

Research output: Contribution to journalArticle

Hirose, K, Nakayama, K & Nakano, H 1994, 'Monofilar Archimedean spiral slot antennas', Electromagnetics, vol. 14, no. 3-4, pp. 415-426.
Hirose K, Nakayama K, Nakano H. Monofilar Archimedean spiral slot antennas. Electromagnetics. 1994 Jul;14(3-4):415-426.
Hirose, Kazuhide ; Nakayama, Kazuo ; Nakano, Hisamatsu. / Monofilar Archimedean spiral slot antennas. In: Electromagnetics. 1994 ; Vol. 14, No. 3-4. pp. 415-426.
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