منابع مشابه
On the Optimum Directivity of Uniformly Spaced Broadside Arrays of Parallel Half-Wave Dipoles (RESEARCH NOTES)
The nominal directivity for uniformly spaced broadside parallel half-wave dipoles associated with a uniform excitation is evaluated. The amplitude distribution for an optimized directivity is then obtained for different numbers of elements with the separations between the dipoles as a variable. The optimum and nominal directivities are compared for different spacings of the elements. While thes...
متن کاملSynthesis of Antenna Arrays of Maximum Directivity for a Specified Sidelobe Level
Linear and planar antenna arrays are synthesized to have maximum directivity for a specified sidelobe level. The directivity is maximized subject to a given SLL. The beamwidth and the zeros of array factor are studied as well as the directivity. Maximum directivity-arrays are compared through some examples with super-directive, uniform, Dolph-Chebyshev and Riblet-Chebychev arrays to find a comp...
متن کاملComputations of the Directivity of Spherical Microphone Arrays
The aim of this research is to create a microphone array on a rigid sphere that could be used for teleconferences and for recording of music with the aim of five-channel loudspeaker surround sound reproduction. Experiments were undertaken, within a MATLAB environment, by running computer simulations that tested the directivity of a rigid sphere microphone array in both near and far field. The s...
متن کاملMaximum Constrained Directivity of Oversteered End-Fire Sensor Arrays
For linear arrays with fixed steering and an inter-element spacing smaller than one half of the wavelength, end-fire steering of a data-independent beamformer offers better directivity than broadside steering. The introduction of a lower bound on the white noise gain ensures the necessary robustness against random array errors and sensor mismatches. However, the optimum broadside performance ca...
متن کاملDirectivity of Uniformly Spaced Optimum Endfire Arrays With Equal Sidelobes
A mathe matical formulation is devised for a uniformly spaced and uniformly progressively phased antenna array of a given number of isotropic ele ments such that the final radiation pattern is end fire with no large bac klobe. The pallern also has the maximum number of sidelobes of equal level, modifying the result of an earlier paper, eve n when the ele ment spacing is made arbitrarily small. ...
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ژورنال
عنوان ژورنال: IEEE Transactions on Antennas and Propagation
سال: 1970
ISSN: 0096-1973
DOI: 10.1109/tap.1970.1139620