Submitted on: 28 February 2013.
Revised on: 14 March 2013.
Accepted on: 29 March 2013.
Progress in Electromagnetics Research-PIER
http://reply.papertrans.cn/3/255/25423/25423-32.png
http://reply.papertrans.cn/3/255/25423/25423-33.png
http://reply.papertrans.cn/3/255/25423/25423-34.png
Submitted on: 30 January 2014.
Revised on: 08 February 2014.
Accepted on: 01 March 2014.
Progress in Electromagnetics Research-PIER
http://reply.papertrans.cn/3/255/25423/25423-36.png