Investigation for impact behavior of composite surface antenna
We study the impact characteristic and the performance of composite surface antenna (CSA). The antenna, which operates in GPS band (1.575 GHz) and DMB band (2.635 GHz), was embedded in composite sandwich structure consisting of glass/epoxy laminate, carbon/epoxy laminate, adhesive films and nomex honeycomb. When 20 J of impact energy was applied to arbitrary points on the antenna, the maximum contact force was 4 kN and the antenna proved resistant to impact. The gain of antennas after impact testing was about 6 dBi in GPS band and 4.5 dBi in DBS band.
Impact damage and antenna performance of conformal load-bearing antenna structures
Experimental investigations into the impact response and damage of conformal load-bearing antenna structures composed of a face-skin, a core and a ground plate have been carried out. The damage was examined using non-destructive and destructive methods. The performance of the damaged antenna structure was investigated by measuring the return loss and the radiation pattern in a laboratory compact range. We found that the antenna performance was related to the impact damage, and that there exists a threshold in the impact energy above which the antenna fails to function. For the structure that we studied, the threshold of the impact energy for correct antenna function was between 1.5 and 1.75 J.
Handbook of Concrete Engineering
Handbook of concrete engineering , Handbook of concrete engineering , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی