23-02-2013, 06:34 AM
Researchers have found the solution for dropped calls and low downloading speeds, now a days they are using a special technology called NANORESONATORS is used by this we can improve the performance of the mobile phone.
“There is not enough radio spectrum to accountfor everybody’s handheld portable device,” said Jeffrey Rhoads, an associate professor of mechanical engineering at Purdue University.
This image from a scanning electron microscope shows a tiny mechanical device, an electrostatically actuated nanoresonator, that might ease congestion over the airwaves to improve the performance of cell phones and other portable devices.
The overcrowding results in dropped calls, busy signals, degraded call quality and slower downloads. To counter the problem, industry is trying to build systems that operate with more sharply defined channels so that more of them can fit within the available bandwidth.
“To do that you need more precise filters for cell phones and other radio devices, systems that reject noise and allow signals only near a given frequency to pass,” said Saeed Mohammadi, an associate professor of electrical and computer engineeringwho is working with Rhoads, doctoral student Hossein Pajouhi and other researchers.
The Purdue team has created devices called nanoelectromechanical resonators, which containa tiny beam of silicon thatvibrates when voltage is applied. Researchers have shown that the newdevices are produced with a nearly 100 percentyield, meaning nearly all of the devices created onsilicon wafers were foundto function properly.
“We are not inventing a new technology, we are making them using a process that’s amenable to large-scale fabrication, which overcomes one of the biggest obstacles to the widespread commercial use of these devices,” Rhoads said.
"We learn from our failure, not from our success"