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A phase optimization method to achieve an improvement of the radiation performance of a phased array is proposed. In the proposed method, phases are optimized with taking into account the effects of the amplitude and phase errors at every phase shift of phase shifters on the radiation performance. The optimization method is based on the local search and the simulated annealing method. By applying...
Phased array antennas (PAA) enable to form a main beam in the direction of a desired signal and nulls in the direction of interference signals by adjusting excitation coefficient (amplitude and phase) of each antenna element. One method to form nulls in the direction of interference is sidelobe canceller [1]. The signals received by the auxiliary antennas are adjusted to be the conjugate of the interference...
A novel amplitude-only measurement method is proposed for phased array calibrations. The proposed method can determine a complex element field at every phase shift of a digital phase shifter in phased arrays. The method can be realized using higher order Fourier coefficients of one array-power response measured with the conventional rotating element electric field vector (REV) method. Simulations...
A simplified phase control technique to suppress the interference for the specified direction is proposed in phased array antennas. In this technique, phase distribution is divided into an equiphase part and inclined-phase parts in the beam-scanning plane, and a low-sidelobe characteristic can be achieved by controlling distributions of inclined-phase parts. In the 824-elements array, sidelobe level...
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