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Submitted on: 12 February 2004.
Revised on: 16 April 2004.
Accepted on: 08 June 2004.
___________________IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
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Submitted on: 29 January 2003.
Revised on: 27 February 2003.
Accepted on: 16 March 2003.
___________________IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
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