For some engineers, going to work some days means closing themselves into tomblike rooms that let in no light, little sound and, most importantly, hardly any of the multitude of madly pulsing radio waves emanating from cell phones, laptops and PDAs in the community. Copper mesh cages, called Faraday cages for the 19th-century scientist who invented them, disperse electromagnetic energy, including radio waves. That creates a work space unlike any office cubicle where engineers can monitor the radio waves their equipment is producing without being confounded by stray waves.Read a profile of Aruba Systems from the San Jose Mercury News.