A tilted-beam spiral antenna fed through a helical wire

Author

Nakano, H. ; Okabe, Y. ; Mimaki, H. ; Yamauchi, J.

Author_Institution

Coll. of Eng., Hosei Univ., Tokyo, Japan

Volume

2

fYear

2001

fDate

3-6 Dec. 2001

Firstpage

693

Abstract

A monofilar-spiral antenna is excited through a helical wire. The antenna characteristics, including the input impedance, radiation pattern, and gain, are analyzed. It is revealed that a purely resistive 50-Ω input impedance is realized by appropriately selecting the pitch angle of the helical wire. A tilted beam, which is often required in mobile communications, is obtained with a gain of approximately 8 dB. The frequency responses of the antenna characteristics are also discussed.

Keywords

antenna feeds; antenna radiation patterns; antenna theory; beam steering; electric impedance; frequency response; microwave antennas; mobile antennas; spiral antennas; 50 ohm; 6 GHz; 8 dB; EFIE; H-spiral analysis; antenna characteristics; antenna gain; electric field integral equation; frequency responses; helical wire feed; helical wire pitch angle; method of moments; mobile communications; monofilar-spiral antenna; purely resistive input impedance; radiation pattern; tilted-beam spiral antenna; Antenna radiation patterns; Current distribution; Feeds; Frequency; Helical antennas; Impedance; Mobile communication; Pattern analysis; Spirals; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2001. APMC 2001. 2001 Asia-Pacific

Conference_Location

Taipei, Taiwan

Print_ISBN

0-7803-7138-0

Type

conf

DOI

10.1109/APMC.2001.985466

Filename

985466