Antenna pattern synthesis and shaping
First Claim
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1. An antenna for radiation pattern synthesis over a defined frequency band using the technique of spatial harmonics, comprising:
- a counterpoise;
a monopole radiator for generating electromagnetic radiation at a frequency within the band;
coupling means for coupling the monopole radiator to a source of power;
a plurality of concentric ring arrays of compensated parasitic antenna elements excitable by and concentric with respect to the monopole radiator having the capability of generating a plurality of predetermined harmonic radiation patterns and means for establishing a different harmonic radiation pattern for each array, each ring array adjusted in radius to be near the first peak of the Bessel curves of order equal to the harmonic number;
control means for activating the parasitic antenna elements in a predetermined manner to generate a predetermined number of the first through eighth harmonics and consequently spatial harmonic radiation to form a predetermined electromagnetic wave pattern; and
means for adjusting the predetermined harmonics in phase and amplitude to approximate the applicable Fourier coefficients for the predetermined wave pattern.
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Abstract
An antenna utilizes components of spatial harmonics to synthesis and shape radiation patterns. A counterpoise mounts a monopole radiator as well as a plurality of arrays of parasitic antenna elements excitable by the monopole radiator in a manner to produce the selected harmonics and consequently the desired radiation pattern. The parasitic antenna elements are compensated and are provided with switching to cause their activation. A cone radiator cooperates in exciting the parasitic antenna elements.
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9 Claims
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1. An antenna for radiation pattern synthesis over a defined frequency band using the technique of spatial harmonics, comprising:
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a counterpoise; a monopole radiator for generating electromagnetic radiation at a frequency within the band; coupling means for coupling the monopole radiator to a source of power; a plurality of concentric ring arrays of compensated parasitic antenna elements excitable by and concentric with respect to the monopole radiator having the capability of generating a plurality of predetermined harmonic radiation patterns and means for establishing a different harmonic radiation pattern for each array, each ring array adjusted in radius to be near the first peak of the Bessel curves of order equal to the harmonic number; control means for activating the parasitic antenna elements in a predetermined manner to generate a predetermined number of the first through eighth harmonics and consequently spatial harmonic radiation to form a predetermined electromagnetic wave pattern; and means for adjusting the predetermined harmonics in phase and amplitude to approximate the applicable Fourier coefficients for the predetermined wave pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification