Han-Lin Duan,
Tao Jiang,
Zhao-Qing Sun,
and
Yong-Sheng Zhao,
"Research on Dual Bandpass of Wide Stopband Filter with Tunable Center Frequency," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9,Page(s)1627-1631