Journal ArticleDOI
Illustrations of New Physical Bounds on Linearly Polarized Antennas
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TLDR
In this article, the physical bounds for antennas circumscribed by the rectangular parallelepiped, finite cylinders, and planar rectangles are presented and verified against numerical results for various small antennas with excellent agreement.Abstract:
A recent approach to physical bounds on antennas of arbitrary shape is numerically illustrated. In particular, physical bounds for antennas circumscribed by the rectangular parallelepiped, finite cylinders, and planar rectangles are presented. The bounds are verified against numerical results for various small antennas with excellent agreement.read more
Citations
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Journal ArticleDOI
Experimental Validation of Performance Limits and Design Guidelines for Small Antennas
Daniel F. Sievenpiper,David Carlos Dawson,Minu M. Jacob,Tumay Kanar,Sanghoon Kim,Jiang Long,Ryan Quarfoth +6 more
TL;DR: In this article, the theoretical performance limit for small antenna performance has been validated by all available experimental evidence and the theoretical predictions for the performance due to design factors such as permittivity, aspect ratio, and the internal structure of the antenna are also supported by the experimental evidence.
Journal ArticleDOI
Optimal Antenna Currents for Q, Superdirectivity, and Radiation Patterns Using Convex Optimization
Mats Gustafsson,Sven Nordebo +1 more
TL;DR: Convex optimization is used to determine current distributions that provide upper bounds on the antenna performance and formulations for maximal gain Q-Factor quotient, minimal Q-factor for superdirectivity, and minimum Q for given far-fields are presented.
Journal ArticleDOI
Lower Bounds on the Q of Electrically Small Dipole Antennas
Arthur D. Yaghjian,H.R. Stuart +1 more
TL;DR: In this article, lower bounds on the quality factor (Q) of small electric and magnetic-dipole antennas were obtained for arbitrarily shaped volumes and excited by general sources or by global electric-current sources alone.
Journal ArticleDOI
Physical Bounds and Optimal Currents on Antennas
TL;DR: In this paper, physical bounds on the directivity Q-factor quotient and optimal current distributions are determined for antennas of arbitrary shape and size using an optimization formulation, where a variational approach offers closed form solutions for small antennas expressed in the polarizability of the antenna structure.
Physical Bounds and Optimal Currents on Antennas
TL;DR: In this paper, physical bounds on the directivity Q-factor quotient and optimal current distributions are determined for antennas of arbitrary shape and size using an optimization formulation. But the results are limited to small antennas.
References
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Journal ArticleDOI
Physical Limitations of Omni-Directional Antennas
TL;DR: In this paper, the physical limitations of omni-directional antennas are considered and the potentiality of a broad band width of an antenna with the maximum dimension of 2a has been shown.
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Fundamental Limitations of Small Antennas
TL;DR: In this paper, a simple formula for the more fundamental properties of small antennas and their behavior in a simple circuit is given for 1-Mc operation in typical circuits, which indicates a loss of about 35 db for the I.R.E. standard capacitive antenna, 43 db for a large loop occupying a volume of 1 meter square by 0.5 meter axial length, and 64 db for an antenna loop of 1/5 these dimensions.
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Theoretical limitations on the broadband matching of arbitrary impedances
TL;DR: In this article, the authors considered the problem of matching an arbitrary load impedance to a pure resistance by means of a reactive network and derived necessary and sufficient conditions for the physical realizability of a function of frequency representing the input reflection coefficient of a matching network terminated in a prescribed load impedance.
Journal ArticleDOI
Impedance, bandwidth, and Q of antennas
TL;DR: In this article, exact and approximate expressions for the bandwidth and Q of a general single-feed (one-port) lossy or lossless linear antenna tuned to resonance or antiresonance were derived.