Accurate determination of antenna directivity

Author

Dich, Mikael

Author_Institution

Dept. of Electromagn. Syst., Tech. Univ. Denmark, Lyngby, Denmark

Volume

45

Issue

10

fYear

1997

fDate

10/1/1997 12:00:00 AM

Firstpage

1502

Lastpage

1505

Abstract

The derivation of a formula for accurate estimation of the total radiated power from a transmitting antenna for which the radiated power density is known in a finite number of points on the far-field sphere is presented. The main application of the formula is determination of directivity from power-pattern measurements. The derivation is based on the theory of spherical wave expansion of electromagnetic fields, which also establishes a simple criterion for the required number of samples of the power density. An array antenna consisting of Hertzian dipoles is used to test the accuracy and rate of convergence of the derived formula. Its performance is compared to that of numerical integration using Simpson´s formula

Keywords

antenna radiation patterns; convergence of numerical methods; dipole antenna arrays; directive antennas; integration; transmitting antennas; Hertzian dipoles; Simpson´s formula; antenna directivity; array antenna; convergence rate; electromagnetic fields; far-field sphere; formula; numerical integration; power-pattern measurements; radiated power density; sampling criterion; spherical wave expansion; total radiated power estimation; transmitting antenna; Antenna arrays; Antenna measurements; Antenna theory; Dipole antennas; Directive antennas; Electromagnetic fields; Electromagnetic measurements; Testing; Transmitting antennas; Wave functions;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.633857

Filename

633857