20 July 1999 Testing and development of doubly curved piezoceramic aperture antennas
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Recently, singly curved smart antennas that have the ability of changing their reflector shape through the use of piezoelectric actuators have been studied. The results show that those antennas have the ability to steer and shape radiation patterns in the far-field. As an extension of the previous work, this study examines the use of `doubly curved'--spherical--antenna structures to achieve better performance in controlling an antenna's coverage area. The spherical antenna is made of a thin plastic shell with a small hole at the apex for base mounting. As actuators, four PZT strip patches are attached along the meridians separated by 90 degrees respectively. The antenna structure is modeled following Reissner's shallow spherical shell theory, and the forces developed by the PZT actuators are applied as the boundary conditions at the outer edge. The deformed shape of the antenna is calculated with respect to the applied voltage and the far-field radiation pattern for the shape is simulated on the computer. Based on the theoretical work, an actual working model of the doubly curved antenna is built. Several experiments with the model verify that the beam steering and beam shaping mode can be achieved in the real situation.
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Hwan-Sik Yoon, Hwan-Sik Yoon, Gregory N. Washington, Gregory N. Washington, } "Testing and development of doubly curved piezoceramic aperture antennas", Proc. SPIE 3673, Smart Structures and Materials 1999: Smart Electronics and MEMS, (20 July 1999); doi: 10.1117/12.354263; https://doi.org/10.1117/12.354263

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