A design study of antenna modulation techniques resulting in reduced sidelobe levels
Leane, Stephen Patrick
Cooper, Paul E.
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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 sidelobe 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.
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