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June 2007 [Systems & Subsystems] Checking Capacity For MIMO Configurations Antenna elements arranged in a multiple-input-multiple-output configuration can impact the capacity of a wireless-communications system and combat multipath effects. But one of the keys to improved performance is finding the optimum MIMO layout for a given system scenario, and when it makes sense to stop adding antenna elements and simply optimizing the existing antennas. Last month, this two-part article introduced basic MIMO concepts; this conclusion explains how to calculate... May 2007 [Systems & Subsystems] Multiple Antennas Arm Effective MIMO Systems Capacity is critical for the profitability of larger wireless networks, and multiple-input-multiple-output (MIMO) systems provide potentially high capacity.1 These systems use multiple antenna elements in both the transmitter and receiver to improve the capacity over single antenna topologies when operated in multipath environment. The properties of these antennas play key roles in determining the overall system performance. And, in spite of the number of... July 2005 [Components] Capacitive Loading Shrinks Mobile PIFAs Shrinking cellular telephones call for smaller antennas. One of the more effective antenna designs for mobile applications is the planar inverted-F antenna (PIFA). Fortunately, this proven design can be shrunk without appreciable loss in electrical performance through the use of simple capacitive top loading. Several methods have been applied for antenna size reduction, all at the expense of lower antenna gain and bandwidth.1 This is due to the fact that the antenna is... |
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