A single-arm circular spiral antenna with inner/outer feed circuitry for changing polarization and beam characteristics

Author

Chang won Jung ; Cetiner, B.A. ; De Flaviis, F.

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., Irvine, CA, USA

Volume

4

fYear

2003

fDate

22-27 June 2003

Firstpage

474

Abstract

A single-arm circular spiral antenna has been investigated to get adaptable circular polarization and tilt beam. Circular spiral is printed on a finite size dielectric substrate (/spl epsiv//sub r/=3.27) backed by a finite size-conducting plane. Circular spiral radiates Right Handed Circular Polarization (RHCP) in its inner feed and Left Hand Circular Polarization (LHCP) in its outer feed in one antenna element .Circular spiral has an axial beam (L1=1.64/spl lambda//sub g/) in the z-axis and two-tilted beams (L2=3.25/spl lambda//sub g/, L3=5.55/spl lambda//sub g/) of RHCP in inner feed and LHCP in outer feed at 10GHz, where L is a horizontal arm length. The frequency bandwidth for a 3-dB axial ratio criterion is about 25% in both inner and outer feed at L1=1.64/spl lambda//sub g/.

Keywords

antenna feeds; beam steering; electromagnetic wave polarisation; frequency response; microstrip antennas; spiral antennas; 10 GHz; adaptable circular polarization; adaptable tilt beam; circular spiral antenna; finite size conducting plane; finite size dielectric substrate; frequency response; gain pattern; inner feed; left hand circular polarization; outer feed; right handed circular polarization; single-arm antenna; Adaptive arrays; Antenna feeds; Bandwidth; Circuits; Coaxial components; Dielectric substrates; Frequency; Performance analysis; Polarization; Spirals;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium, 2003. IEEE

Conference_Location

Columbus, OH, USA

Print_ISBN

0-7803-7846-6

Type

conf

DOI

10.1109/APS.2003.1220313

Filename

1220313