Partial randomization of quantized phase error distribution in phased arrays
Abstract
In the phased array antenna employing digital phase shifters, saw-tooth periodic phase errors occur over the array aperture if the quantized phase is selected so as to minimize the phase error. This phase error causes an increase of the sidelobes. This paper describes a method of suppressing these sidelobes due to the quantized phase error by partially randomizing the quantized phase error distribution. According to the analysis of the sidelobes using statistically averaged continuous wave sources, optimum values exist in parameters with regard to the length of the range which the quantized phase error distribution is randomized. This method can reduce the sidelobe level by 8.7 dB compared to the conventional method which minimizes the phase error. This method is applied to 41-element linear arrays and its effectiveness on the sidelobe suppression is confirmed numerically.
- Publication:
-
Electronics Communications of Japan
- Pub Date:
- May 1976
- Bibcode:
- 1976JElCo..59...76M
- Keywords:
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- Digital Systems;
- Linear Arrays;
- Phase Error;
- Phased Arrays;
- Sidelobe Reduction;
- Statistical Distributions;
- Antenna Design;
- Antenna Radiation Patterns;
- Design Analysis;
- Network Analysis;
- Random Processes;
- Communications and Radar