Improved formulas for the Q of antennas with highly lossy dispersive materials

被引：23

作者：

Yaghjian, Arthur D. ^{[1
]}

机构：

[1] AFRL SNHA, Hanscom AFB, MA 01731 USA

来源：

IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS | 2006年 / 5卷

关键词：

antennas; bandwidth; energy density; quality factor;

D O I：

10.1109/LAWP.2006.881913

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：

Formulas obtained by Yaghjian and Best [IEEE Trans. Antennas Propagat., vol. 53, pp. 1298-1324, Apr. 2005] for the quality factor (Q) of antennas containing linear passive media that is not too highly lossy and dispersive are generalized to hold in highly lossy dispersive media as well. The generalization is obtained by means of a straightforward, though ad hoc, definition of nonnegative energy densities that determine a Q which is approximately equal to twice the inverse of the matched VSWR half-power fractional impedance bandwidth of the antenna. The Q for a straight-wire antenna embedded in highly lossy dispersive media is computed using the generalized energy densities and is shown to agree closely with twice the inverse of the half-power fractional bandwidth of the antenna. Other antennas modeled by resonant RLC series and parallel circuits with the inductors and capacitors filled with lossy dispersive material further confirm the improvement in the inverse-bandwidth accuracy of the Q computed from the generalized energy densities.

引用

页码：365 / 369

页数：5

共 10 条

[1] Electromagnetic energy in a dispersive metamaterial [J].