منابع مشابه
Minimum Q of Electrically Small Antennas: a Critical Review
This paper seeks to succinctly e aluate and summarize the large body of literature on the radiation Q of electrically small antennas. The alidity of the different analytic models is discussed, with key Q-dependent physical properties compared with experimental data and numerical simulations. 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 28: 172 177, 2001.
متن کاملSMALL ANTENNAS Basic Principles of Electrically Small Antennas
E lectrically small antennas have been an important part of communications engineering since the beginning. Whether they are small compared to the extremely long wavelengths used at the lowest radio frequencies, or intended to save space in GHz-range wireless devices, the basic principles are the same. This tutorial will review those principles, with primary attention to describing the performa...
متن کاملMetamaterial-Based Efficient Electrically Small Antennas
A metamaterial paradigm for achieving an efficient, electrically small antenna is introduced. Spherical shells of homogenous, isotropic negative permittivity (ENG) material are designed to create electrically small resonant systems for several antennas: an infinitesimal electric dipole, a very short center-fed cylindrical electric dipole, and a very short coaxially-fed electric monopole over an...
متن کاملA Re-Examination of the Fundamental Limits on the Radiation Q of Electrically Small Antennas
AbstructAn exact method, which is more straightforward than those previously published, is derived for the calculation of the minimum radiation Q of a general antenna. This expression agrees with the previously published and widely cited approximate expression in the extreme lower limit of electrical size. However, for the upper end of the range of electrical size which is considered electrical...
متن کاملOn the Lower Bound of the Radiation Q for Electrically Small Antennas
The fundamental question of the lower bound on the radiation Q of an electrically small antenna is of practical importance because of its relationship to the antenna bandwidth. Previous works predict a lower bound on the radiation Q that is usually too low and, hence, a bandwidth that can be optimistically large. This paper addresses why this is so and offers a new prediction for a realizable l...
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ژورنال
عنوان ژورنال: IEEE Transactions on Antennas and Propagation
سال: 2012
ISSN: 0018-926X,1558-2221
DOI: 10.1109/tap.2012.2201096