Authors: Arthur D. Yaghjian,Mats Gustafsson, B. Lars G. Jonsson
Source: FERMAT, Volume 4, Communication 1, Jul._Aug., 2014
Abstract: Beginning with an introduction to bandwidth and Q of electrically small antennas (ESA’s), general formulas are given for energy density and Q in highly dispersive lossy (HDL) material and low-loss or nondispersive conductive (nc) material. Lower-bound formulas for the Q of electrically small dipole antennas are found in terms of their volume polarizabilities, radiated powers, and radiation efficiencies. It is shown that highly dispersive materials enable single dipole antennas to overcome the Chu lower bound by sacrificing efficiency. The talk ends with a hypothetical ESA that has a Q equal to half the “Chu lower bound”.
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QUALITY FACTOR FOR ANTENNAS (A TUTORIAL)