MINIMUM Q FOR LOSSY AND LOSSLESS ELECTRICALLY SMALL DIPOLE ANTENNAS

被引：38

作者：

Yaghjian, Arthur D. ^{[1
]}

Gustafsson, Mats ^{[2
]}

Jonsson, B. Lars G. ^{[3
]}

机构：

[1] Electromagnet Res Consultant, Concord, MA 01742 USA

[2] Lund Univ, Dept Elect & Informat Technol, SE-22100 Lund, Sweden

[3] KTH Royal Inst Technol, Sch Elect Engn, SE-10044 Stockholm, Sweden

来源：

PROGRESS IN ELECTROMAGNETICS RESEARCH-PIER | 2013年 / 143卷

关键词：

PHYSICAL LIMITATIONS; ELECTROMAGNETIC ENERGY; QUALITY FACTOR; LOWER BOUNDS; IMPEDANCE; BANDWIDTH; DENSITY; THEOREM;

D O I：

10.2528/PIER13103107

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

General expressions for the quality factor (Q) of antennas are minimized to obtain lower-bound formulas for the Q of electrically small, lossy or lossless, combined electric and magnetic dipole antennas confined to an arbitrarily shaped volume. The lower-bound formulas for Q are derived for dipole antennas with specified electric and magnetic dipole moments excited by both electric and magnetic surface currents as well as by electric surface currents alone. With either excitation, separate formulas are found for the dipole antennas containing only lossless or "nondispersive-conductivity" material and for the dipole antennas containing "highly dispersive lossy" material. The formulas involve the quasi-static electric and magnetic polarizabilities of the associated perfectly conducting volume of the antenna, the ratio of the powers radiated by the specified electric and magnetic dipole moments, and the efficiency of the antenna.

引用

页码：641 / 673

页数：33

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