In this paper, the feasibility of using electronically steerable antennas for health monitoring of civil structures and early warning of collapsing bridges of the approaching vehicles is presented. These antenna can also be used in automobile collision warning systems. These antennas are lightweight, low volume, low profile and conformal. They have low fabrication costs and are easily mass produced. They are thin and do not perturb the aerodynamics of a host automobile. Linear, cicular, and dual polarization are achieved with simple changes in feed position. Beam steering is accomplished by varying the relative phase between radiating elements. In planar array, both horizontal and vertical beam can be combined to provide full scanning capabilities. Tunable ceramic phase shifters are used in these antennas. The dielectric properties of the ferroelectric material are changed by a bias voltage. In the case of health monitoring of civil structures, these antennas are used in conjunction with ferroelectric sensors. The sensors are fabricated with interdigital transducers printed on a piezoelectric polymer or ceramic type film. They are in turn mounted onto a ultra thin Penn State's novel RF antenna. The wave form measurements may be monitored at a remote location via the antenna in the sensors and the electronically steerable antenna outlined above.
Smart electronics and sensors for IVHS and automobile collision warning antenna systems
Intelligente Elektronik und Sensoren für Bauwerküberwachung und Kraftfahrzeugkollisionsantennenwarnsysteme
1995
6 Seiten, 5 Bilder, 4 Quellen
Conference paper
English
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