Submitted on: 23 November 2006.
Revised on: 23 February 2007.
Accepted on: 18 March 2007.
___________________ELECTRONICS LETTERS---WILEY
http://reply.papertrans.cn/1/83/8241/8241-32.png
http://reply.papertrans.cn/1/83/8241/8241-33.png
Submitted on: 04 September 2012.
Revised on: 14 November 2012.
Accepted on: 01 January 2013.
___________________ELECTRONICS LETTERS---WILEY
Submitted on: 21 July 2001.
Revised on: 22 October 2001.
Accepted on: 27 November 2001.
___________________ELECTRONICS LETTERS---WILEY
http://reply.papertrans.cn/1/83/8241/8241-36.png