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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...
An improved genetic algorithm (GA) is proposed for beam forming of spaceborne Synthetic Aperture Radar (SAR), which is equipped with active phased array antenna (APAA). The basic idea of the approach is that the phase and amplitude distributions of the element excitations can be represented by a few basis functions, as any functions can be expressed by a set of the complete orthogonal basis functions...
For the issue that embedded devices have limited space, this paper proposes a static balanced tree-S-B tree to substitute B+-tree as index of embedded database. Based on some embedded databases do not have to insert and delete on the actual application, S-B tree combines the brilliant time efficiency of B+-tree and the space utilization of static tree to reduce space waste by B+-tree index. We use...
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