Submitted on: 18 February 2011.
Revised on: 17 March 2011.
Accepted on: 07 May 2011.
___________________IEEE Open Journal of Antennas and Propagation
Submitted on: 11 March 2003.
Revised on: 17 June 2003.
Accepted on: 19 July 2003.
___________________IEEE Open Journal of Antennas and Propagation
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Submitted on: 17 April 2009.
Revised on: 30 July 2009.
Accepted on: 22 August 2009.
___________________IEEE Open Journal of Antennas and Propagation