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An effective and executable design procedure for equal amplitude excited sparse phased array for the application of Space-borne Synthetic Aperture Radar (SAR) is presented. The procedure consists of three steps: 1) primary sparse array synthesis, 2) full wave simulation for active patterns extraction and 3) phase refinement for final results. The mutual coupling effects, which have not been widely...
Suppression of grating lobes caused by spatial aliasing should be considered in array design for underwater acoustic imaging. To address this problem, a different approach to beamform with nonsinusoidal signal for grating lobes suppression is proposed in this paper. The desirable nonsinusoidal signal can be obtained by exacting the envelopes of the received signals. The reception of the envelopes...
Based on the joint information of space-time-frequency, a novel scheme is proposed for localizing the low-frequency tone noise sources of an underwater moving vehicle by using a small aperture circular array. First, the Doppler signals formed when the noise sources pass through the closest point of approach (CPA), are separated in time domain with superdirectivity beamforming. Thereafter, processing...
A single-layer substrate integrated waveguide slot array is presented for use in low sidelobe applications. A compact three-level power divider is developed to provide the required phase distribution and enhanced co-phase bandwidth. Then, the Elliott’s design procedure is employed taking accurately into account both the external coupling and the high-order mode internal coupling. The measured radiation...
In this paper, with the application of dielectric resonator antennas(DRA), a novel design of a shared-aperture dual-band dual-polarized (DBDP) array working in the Ka/Ku bands is proposed. At Ka-band, aperture-coupled microstrip patches are selected as the radiating elements. At Ku-band, Crossed dielectric resonator antennas(DRA) are selected as the radiating elements. The array which comprises 2×2...
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