Re-visitation on the input impedance of two-arm frequency-independent antennas in free space

Author

Teng-Kai Chen ; Huff, Gregory H.

Author_Institution

Dept. of Electr. & Comput. Eng., Texas A&M Univ., College Station, TX, USA

fYear

2013

fDate

7-13 July 2013

Firstpage

2137

Lastpage

2138

Abstract

The proposed analytical close-form solutions for the input impedance of planar two-arm Archimedean spiral antenna in free space is a function of metallization ratio and can fulfill the Babinet´s principle fundamentally. Therefore, the applications of proposed model to other planar frequency-independent (FI) antennas are examined and discussed in this paper. It is found that Archimedean and equiangular spiral can be truly FI antennas based on their geometric formulas, while log-periodic and sinuous antennas exhibit FI properties only at self-complementary structure. Measurements and numerical simulations of several FI antennas validate the statement.

Keywords

log periodic antennas; planar antennas; spiral antennas; Babinet principle; analytical close-form solutions; equiangular spiral antennas; free space; input impedance; log-periodic antennas; metallization ratio; planar frequency-independent antennas; planar two-arm Archimedean spiral antenna; sinuous antennas; two-arm frequency-independent antennas; Antenna measurements; Broadband antennas; Geometry; Impedance; Metallization; Spirals;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE

Conference_Location

Orlando, FL

ISSN

1522-3965

Print_ISBN

978-1-4673-5315-1

Type

conf

DOI

10.1109/APS.2013.6711727

Filename

6711727