Journal
IEEE ANTENNAS AND PROPAGATION MAGAZINE
Volume 51, Issue 5, Pages 38-41Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/MAP.2009.5432037
Keywords
Electrically small antennas; fundamental limitations; Chu Q; antenna bandwidth; antenna theory
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The Chu fundamental limitation on Q for electrically small antennas is well known and widely used. However, Chu did not include energy stored inside the hypothetical enveloping sphere. Exact calculation of total stored energy by Thai gives a new Q, which should better match well-designed electrically small antennas. The TM- and TE-mode Q formulas are derived, and a simple approximate form for the lowest-order TM mode is presented.
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