Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1995-12-15
1998-09-22
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
H01Q 322, H01Q 324, H01Q 326
Patent
active
058120882
ABSTRACT:
The invention concerns a beam forming network for radiofrequency antennas and applying to the input signals a two-dimensional hexagonal discrete Fourier transform in order to control radiating elements for generating multiple beams. The number of inputs and outputs is equal to N.sub.t with N.sub.t =R.times.N.sup.2, R and N being integers. A first circuit layer comprises a row of N.sup.2 cells each having R inputs and R outputs, each cell receiving a signal present at one of said N.sub.t inputs and applying to the signals present at its R inputs a one-dimensional R.times.R discrete Fourier transform, and a second circuit layer comprises R independent sets of cells each having N inputs and N outputs, each set including a first row and a second row of N cells, each cell applying to the signals present at its N inputs a one-dimensional R.times.R discrete Fourier transform.
The invention also concerns a hardware structure for a network of this kind.
REFERENCES:
patent: 4231040 (1980-10-01), Walker
patent: 4356461 (1982-10-01), Acoraci
patent: 4424500 (1984-01-01), Viola et al.
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patent: 4989011 (1991-01-01), Rosen et al.
Proceedings of the IEEE, vol. 67, No 6, Jun. 1979 New York US, pp. 930-949, Mersereu "The Processing of Hexagonally . . . . signals ".
Antenna Applications Symposium, 23 Sep. 1981-25 Sep. 1981 Monticello, Il, USA Chadwick, et al. "An algebraic . . . ".
French Search Report (dated Sep. 22, 1995) 2 pages.
Bosch Javier Ventura-Traveset
Bosch Wolfgang
Pi Franceso Coromina
Yarwood Mike
Agence Spatiale Europeenne
Blum Theodore M.
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