Zhiqiang Gao Jianguo Ma Yizheng Ye Mingyan Yu Large tuning band range of high frequency filter for wireless applications. 384-387 2005 conf/iscas/2005 ISCAS (1) http://dx.doi.org/10.1109/ISCAS.2005.1464605 db/conf/iscas/iscas2005-1.html#GaoMYY05