Journal ArticleDOI
Maximum gain of Yagi--Uda arrays
TLDR
In this article, numerical optimisation techniques have been used to find the maximum gain of specific parasitic arrays, such as an array of infinitely thin, equispaced dipoles loaded with arbitrary reactances.Abstract:
Numerical optimisation techniques have been used to find the maximum gain of some specific parasitic arrays. The gain of an array of infinitely thin, equispaced dipoles loaded with arbitrary reactances has been optimised. The results show that standard travelling-wave design methods are not optimum. Yagi--Uda arrays with equal and unequal spacing have also been optimised with experimental verification.read more
Citations
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Journal ArticleDOI
Reactively controlled directive arrays
TL;DR: The radiation characteristics of an N -port antenna system can be controlled by impedance loading the ports and feeding only one or several of the ports, and the direction of maximum gain can becontrolled by varying the load reactances.
Journal ArticleDOI
Optimum element spacings for Yagi-Uda arrays
David K. Cheng,C. Chen +1 more
TL;DR: In this paper, a method for the maximization of the forward gain of a Yagi-Uda array by adjusting the interelement spacings was developed, where currents in the array elements were approximated by three-term expansions with complex coefficients which converted the governing integral equations into simultaneous algebraic equations.
Journal ArticleDOI
Gain optimization for Yagi-Uda arrays
TL;DR: In this paper, the authors present a personal account of the search for a design procedure for Yagi-Uda antenna arrays yielding a maximum gain, or directivity if element losses are neglected.
Journal ArticleDOI
Application of bacteria foraging algorithm for the design optimization of multi-objective Yagi-Uda array
TL;DR: The objective of this article is to apply this new optimization technique, BFA, in the design of Yagi‐Uda array for multi‐objective design parameters to achieve higher directivity, pertinent input impedance, minimum 3‐dB beam width, and maximum front to back ratio.
References
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Journal ArticleDOI
An Automatic Method for Finding the Greatest or Least Value of a Function
Journal ArticleDOI
Optimization of directivity and signal-to-noise ratio of an arbitrary antenna array
TL;DR: In this article, a unified formulation is made for the optimization of directivity and signal-to-noise ratio of an arbitrary array, with or without a constraint on the array Q-factor.
Journal ArticleDOI
A new method for obtaining maximum gain from yagi antennas
H. Ehrenspeck,H. Poehler +1 more
TL;DR: In this article, the authors introduced the notion of a surface wave traveling along the array and demonstrated experimentally the interrelationship between these parameters, and proposed a design procedure that provides maximum gain for a given array length.