Device for antenna systems

Details Device for antenna systems Device for antenna systems

1998-07-10

1999-11-02

Tarcza, Thomas H.

Communications: radio wave antennas

Antennas

Slot type

H01Q 1310

Patent

active

059779250

ABSTRACT:
The present invention relates to a device at an antenna for eliminating grid lobes in the radar cross section of the antenna.
The invention displaces the grid lobes to a frequency range outside the working frequency of the antenna by inserting rows of dummy elements (r.sub.3, r.sub.4, r.sub.5) between rows of ordinary antenna elements (r.sub.1, r.sub.2) in the antenna (11). The dummy elements will behave like the ordinary antenna elements (15) as regards the rescattering when the dummy elements (17) are irradiated with signals from outside. Furthermore, the dummy elements (17) are not fed by a feeding network (16a, 16b) with microwave signals as is the case with the ordinary antenna elements (15). The dummy elements (17) are arranged in the rows of dummy elements (r.sub.3, r.sub.4, r.sub.5) so that the distances in X-direction and in Y-direction (a.sub.4, a.sub.5, a.sub.6, a.sub.7, a.sub.8) between these elements and nearby ordinary elements are less than half a wavelength of the threat frequency of the antenna. The threat frequency constitute the frequency range in which an incoming signal to the antenna constitutes a threat. Thereby no grid lobes will occur in the radar cross section of the antenna.

REFERENCES:
patent: 4684952 (1987-08-01), Munson
patent: 5172127 (1992-12-01), Josefsson
patent: 5461392 (1995-10-01), Mott et al.

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