Realization of wideband characteristics for a spiral antenna backed by a conducting plane reflector

Author

Nakano, H. ; Soga, H.

Author_Institution

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

fYear

1989

Firstpage

1312

Abstract

It is shown that backing a spiral antenna with a conducting plane reflector narrows the inherent wideband radiation characteristics of the spiral by distorting the current distribution. When a small, circular conducting plane is inserted between the spiral and the plane reflector, the distorted current distribution can be changed to a traveling wave. This traveling-wave current has a decaying amplitude, leading to a desirable radiation beam of good circular polarization. The frequency band for CPW (circularly polarized wave) radiation can be extended from 1:1.18 without the small disk 1:1.42 with the disk.<>

Keywords

antenna radiation patterns; antenna reflectors; electromagnetic wave polarisation; microwave antennas; EM wave polarization; circular polarization; conducting plane reflector; decaying amplitude; distorted current distribution; small disk; spiral antenna; traveling-wave current; wideband radiation characteristics; Arm; Broadband antennas; Current distribution; Frequency; Image analysis; Image restoration; Moment methods; Polarization; Reflector antennas; Spirals;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 1989. AP-S. Digest

Conference_Location

San Jose, CA, USA

Type

conf

DOI

10.1109/APS.1989.134953

Filename

134953