NDLI: A discussion on electrically small antennas surrounded by lossy dispersive materials

Content Provider	IEEE Xplore Digital Library
Author	Best, Steven R.
Copyright Year	2006
Description	Author affiliation: MITRE, 202 Burlington Road, M/S S230, Bedford, MA 01730 USA (Best, Steven R.)
Abstract	For any electrically small antenna there is a fundamental lower bound on the achievable quality factor, which is defined in terms of the antenna¿s occupied volume and the operating frequency. As either the size of the antenna or the operating frequency decreases, this lower bound increases as approximately 1/(ka)3, where k is the free space wave number 2¿/¿, and a is the radius of an imaginary sphere circumscribing the maximum dimension of the antenna. The significance of both quality factor (Q) and the lower bound (Qlb) in characterizing the performance of an electrically small antenna is the fact that for most electrically small antennas, the matched Voltage Standing Wave Ratio (VSWR) bandwidth is inversely proportional to Q. So long as the inverse relation between Q and matched VSWR bandwidth holds, the lower bound on Q can be used to define an upper bound on matched VSWR bandwidth.
Starting Page	1
Ending Page	7
File Size	355146
Page Count	7
File Format	PDF
ISBN	9789290929376
DOI	10.1109/EUCAP.2006.4584660
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-11-06
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	ESA
Subject Keyword	Dipole antennas Q factor Dielectric materials Bandwidth Frequency Antenna feeds Metamaterials Impedance Dispersion Transmission line antennas
Content Type	Text
Resource Type	Article

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