Antenna feed network
First Claim
1. In an antenna feed system where an orthogonal beam matrix connected to a plurality of radiators provides excitation signals thereto representative of a discrete Fourier transform of an even function in response to inverse transform signals representative of said function, the improvement comprising:
- circuit means for providing a group of signals representative of values of the amplitude of said function as approximated by the first three terms of a Fourier cosine series in response to a signal from a transmitter; and
phase shifting means for causing signals of said group to have phase shifts relative to each other that correspond to phase shifts of said values, whereby said phase shifting means provides said inverse transform signals.
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Accused Products
Abstract
A distribution network provides signals that are representative of the sum of the amplitudes of values of the first, second and third terms of a Fourier cosine series expansion of the discrete inverse Fourier transform of a desired pattern of excitation of a purality of radiators. The signals are coupled to an orthogonal beam matrix via a plurality of phase shifters to provide a signal representation of an approximation of the inverse transform. The matrix is connected to the radiators whereby the desired pattern of excitation is applied to the radiators.
10 Citations
3 Claims
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1. In an antenna feed system where an orthogonal beam matrix connected to a plurality of radiators provides excitation signals thereto representative of a discrete Fourier transform of an even function in response to inverse transform signals representative of said function, the improvement comprising:
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circuit means for providing a group of signals representative of values of the amplitude of said function as approximated by the first three terms of a Fourier cosine series in response to a signal from a transmitter; and phase shifting means for causing signals of said group to have phase shifts relative to each other that correspond to phase shifts of said values, whereby said phase shifting means provides said inverse transform signals. - View Dependent Claims (2, 3)
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Specification