Accession Number : AD0810292

Title :   A DESIGN STUDY OF ANTENNA MODULATION TECHNIQUES RESULTING IN REDUCED SIDELOBE LEVELS.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Leane, Stephen Patrick

Report Date : DEC 1966

Pagination or Media Count : 78

Abstract : It is desirable, for many applications, to utilize a receiving antenna system which is sensitive only to radiation from a specific direction. In order to eliminate the incoming signals from all other directions, the side-lobe strength in these regions must be significantly lower than the main beam. Time modulation was applied to certain of the antenna's parameters in an effort to reduce the sidelobe level of a linear receiving antenna array. Such factors as the effective length of the array, and the frequency and phase of the signals received by each of the individual elements were periodically varied in time. After summing the voltage contribution from each element, the resultant signal was suitably filtered and sent to the detector. Antenna field patterns were developed in mathematical terms and the experimental calculations were made on the CDC 1604 computer. For all forms of modulation investigated, it was possible to reduce the sidelobe strength by more than an order of magnitude below the unmodulated level. (Author)

Descriptors :   *MODULATION), (*ANTENNA ARRAYS, (*RADAR ANTENNAS, MODULATION), (*ANTENNA LOBES, REDUCTION), RADIO RECEPTION, THESES, ANTENNA RADIATION PATTERNS.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE