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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...
A compact microstrip-line-fed double T-shaped slots antenna with a rectangular patch for bandwidth enhancement is proposed and experimentally studied. By attaching a rectangular patch to the end of the microstrip feed line, a feature of bandwidth enhancement for the antenna is achieved well. From the experimental results, the measured impedance bandwidth of the fabricated prototype can cover a wide...
The design and analysis of a novel compact fork-shaped UWB antenna with triple band-notched characteristics are presented in this paper. The measured bandwidth of the proposed antenna occupies about 8.0 GHz covering from 3.0 GHz to 11.0 GHz with triple notched bands of 3.3-3.7 GHz, 5.1-5.3 GHz, and 5.65-5.9 GHz which are achieved by embedding a spade-shaped slot and a curl slotline on the radiating...
A novel centre-fed printed reflectarray using windmill elements is presented. The analysis of the structure and computation of the phase curves for the field reflected from the patches, needed for the design of the elements, have been carried out with the commercial software Ansoft HFSS. The reflectarray sample is a 37-elements structure, and the results have shown good pattern behaviour and symmetry...
Geostationary satellite working life must take into account various factors. When it is close to the end of life, although the satellite payload will still be effective, the remaining fuel is not sufficient to maintain their positions of latitude, but only enough for keeping their station of longitude. If they can be used for slightly inclined geostationary orbit (SIGSO) satellite communication, their...
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