Communications: radio wave antennas – Antennas – Plural antennas spaced a fractional or full wave length apart
Patent
1979-05-14
1980-07-15
Lieberman, Eli
Communications: radio wave antennas
Antennas
Plural antennas spaced a fractional or full wave length apart
343100SA, 343854, H01Q 326
Patent
active
042131316
ABSTRACT:
An antenna array comprising at least three interferometer pairs of antenna elements with selected spacings made to form a single beam which is readily scannable. All spatial frequencies generated by a signal and intercepted by the array are derived from a signal processing technique applied to the array. The array samples space in the spatial frequency domain while the signal processing technique utilizes real time convolution of functions in the spectral frequency domain. Summation of the appropriate spatial frequencies is equivalent to a Fourier transform operation, yielding the location of the signal source in space. Resolution and freedom from interference of the interferometer system is equal to that of a fully filled array of the same aperture size containing element spacings of one-half wavelength. An antenna array system comprising four antenna elements forming six interferometer pairs with a resolution equal to that of a sixteen element array with spacings of one-half wavelength is described, as well as other multiples of one-quarter wavelength or partial multiples of a wave length.
REFERENCES:
patent: 3766559 (1973-10-01), Butcher et al.
Lieberman Eli
Manning John R.
Sandler Ronald F.
The United States of America as represented by the Administrator
Tresansky John O.
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