Physical limitations on antennas of arbitrary shape

被引：195

作者：

Gustafsson, Mats ^{[1
]}

Sohl, Christian ^{[1
]}

Kristensson, Gerhard ^{[1
]}

机构：

[1] Lund Univ, Dept Elect & Informat Technol, S-22100 Lund, Sweden

来源：

PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES | 2007年 / 463卷 / 2086期

关键词：

physical limitations; antennas; polarizability; scattering cross-section; dispersion relation; optical theorem;

D O I：

10.1098/rspa.2007.1893

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

In this paper, physical limitations on bandwidth, realized gain, Q-factor and directivity are derived for antennas of arbitrary shape. The product of bandwidth and realizable gain is shown to be bounded from above by the eigenvalues of the long-wavelength, high-contrast polarizability dyadics. These dyadics are proportional to the antenna volume and are easily determined for an arbitrary geometry. Ellipsoidal antenna volumes are analysed in detail, and numerical results for some generic geometries are presented. The theory is verified against the classical Chu limitations for spherical geometries and shown to yield sharper bounds for the ratio of the directivity and the Q-factor for non-spherical geometries.

引用

页码：2589 / 2607

页数：19

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