A Circuit Model for Electrically Small Antennas

Author

Pfeiffer, Carl ; Grbic, Anthony

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Univ. of Michigan, Ann Arbor, MI, USA

Volume

60

Issue

4

fYear

2012

fDate

4/1/2012 12:00:00 AM

Firstpage

1671

Lastpage

1683

Abstract

A circuit model for electrically small antennas is introduced that is based on their frequency-dependent polarizabilities. This model is useful for straightforwardly analyzing several different small antenna geometries. A negative permittivity sphere, shell, and spheroid are all analyzed. An inductively loaded dipole, a top-hat loaded dipole, and a spherical sheet impedance are also analyzed. The circuit model provides the antenna´s radiation quality factor (Q), radiation efficiency (η_rad), and bandwidth. It also offers insight into the operation of the antenna which can aid and simplify design.

Keywords

Q-factor; antenna radiation patterns; dipole antennas; electric impedance; electromagnetic wave polarisation; equivalent circuits; geometry; integrated circuit modelling; metamaterials; permittivity; antenna radiation quality factor; bandwidth; circuit model; electrically small antenna; equivalent circuit; frequency-dependent polarizabilities; inductively loaded dipole; metamaterial; negative permittivity shell; negative permittivity sphere; negative permittivity spheroid; radiation efficiency; resonator; small antenna geometries; spherical sheet impedance; top-hat loaded dipole; Dipole antennas; Equivalent circuits; Impedance; Integrated circuit modeling; Permittivity; RLC circuits; ${rm Q}$ factor; Electrically small antennas; equivalent circuits; metamaterials; resonators;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2012.2186232

Filename

6143985