2nd June 2008, 03:03 pm
Antennas serve as transducers between electromagnetic waves traveling in free space and guided electromagnetic signals in circuits. As such, they play a critical role in the performance of wireless communication systems. With the proliferation of mobile wireless services that deliver voice and/or data in smaller and smaller devices, the task to design an antenna for a portable unit that meets not only operational requirements but also aesthetic and packaging restrictions is becoming more and more challenging. As result, engineers rely on a combination of theory, simulation, and experimental investigation to arrive at a design that meets all the demands of a particular application.
Basic Antenna Parameters
The basic parameters of antenna are impedence, mismatch and ohmic efficiency, radiation pattern and polarization, directivity, gain and equivalent isotropically radiated power, and effective height and aperture. In addition, celebrated Friis equation is and equations for the signal to noise ratio (SNR) of an antenna and source-field relationships are also important.For a more detailed treatment of the material pointed out here, the reader is referred to “A HANDBOOK OF ANTENNA IN WIRELESS COMMUNICATION” OF CRC Press by Lal Chand Godara.
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30th January 2008, 03:03 pm
Motion suit eliminates need for multiple camerasAt the 2008 Consumer Electronics Show here in Las Vegas, Xsens Technologies B.V. yesterday demonstrated a motion capture suit that eliminates the need for multiple cameras and optical markers.
Known as the Moven motion capture system, the new suit incorporates three Analog Devices gyroscopic sensors, three accelerometers, three magnetometers and an Analog Devices Blackfin digital signal processor (DSP). All of the sensors reside in a small module that measures approximately 2 inches x 1 inch and fits under a motion suit. One suit incorporates 16 of the sensors modules. Using the company’s software, motions are captured and displayed on a PC screen.
“We’re adding software algorithms to handle data from the sensors and apply it to a biomechanical model of a human being,” says Gerben Groothuis, director of marketing and sales for Xsens.
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