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A new type of dual-band ESPAR (Electronically Steerable Parasitic Array Radiator) array antenna is presented. The antenna consists of one feeding radiating element and two-layer parasitic radiating elements. The parasitic radiating element of each layer is composed of 6 parasitic monopoles and placed in the near field of the active radiator. Replacing the reactance-load, the on/off controlling is...
The full-size VHF/UHF antenna feed array prototype for the MOSS radar antenna system was successfully built and tested. The validity of the design and feasibility of constructing such a feed system for a future spaceborne radar that has a 30-m mesh reflector antenna was demonstrated. No road blocks or major remaining challenges were identified, though several potentials for improvement were identified...
A Ku/Ka dual-band reflectarray has been developed as a demonstration model for the next generation of Titan cloud precipitation radar and altimeter (TCPRA). The reflectarray developed is a substitute of a parabolic cylindrical reflector and it is offset-fed by two linear arrays. The antenna has a 50-cm-square aperture and uses two 2-mil thick membranes for both bands enabling transformation into a...
As penetration depth through vegetation and ground becomes more important in active remote sensing applications, there is a shift toward using lower frequencies. To facilitate imaging of ground water, soil moisture and composition, and penetrating through forest canopies, a dual-band synthetic aperture radar (SAR) has been proposed to operate at VHF and UHF frequencies. To accommodate weekly repeat...
A VHF microstrip patch antenna was developed to achieve a bandwidth of 45 MHz (30%) from 127 to 172 MHz with dual-linear-polarization capability. This microstrip antenna, having a size of 117 cm times 117 cm times 27 cm, used low-dielectric-constant foam substrates and dual-stacked patches with capacitive probe feeds to achieve the required wide bandwidth. Four such capacitive feeds were used to achieve...
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