Submitted on: 29 July 2009.
Revised on: 16 September 2009.
Accepted on: 05 November 2009.
___________________IEEE Antennas and Wireless Propagation Letters
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Submitted on: 15 February 2005.
Revised on: 16 March 2005.
Accepted on: 30 March 2005.
___________________IEEE Antennas and Wireless Propagation Letters
Submitted on: 28 June 2012.
Revised on: 06 October 2012.
Accepted on: 27 October 2012.
___________________IEEE Antennas and Wireless Propagation Letters
Submitted on: 20 May 1999.
Revised on: 07 July 1999.
Accepted on: 20 July 1999.
___________________IEEE Antennas and Wireless Propagation Letters
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Submitted on: 10 November 1998.
Revised on: 01 December 1998.
Accepted on: 18 December 1998.
___________________IEEE Antennas and Wireless Propagation Letters