1. [1] Y. K. Kim and S. W. Hwang, “Wideband Bandpass Filter Using Unpowered HEMT Amplifiers, ” Microw. Opt. Technol. Lett., vol. 50, no. 8, pp. 2197-2200, Aug. 2008.
2. [2] C.-Y. Chen, C.-Y. Hsu, and S.-F. Lin, “A Novel Compact Miniaturized Wideband Microstrip Bandpass Filters with Dual-mode Ring Resonators, ” Microw. Opt. Technol. Lett., vol. 45, no. 4, pp. 312-315, May 2005.
3. [3] C.-Y. Chen and C.-Y. Hsu, “Design of a UWB Low Insertion Loss Bandpass Filter with Spurious Response Suppression, ” Microw. Journal, vol. 49, no. 2, pp. 112-117, Feb. 2006.
4. [4] L.-H. Hsieh and K. Chang, “Compact, Low Insertion-Loss, Sharp-Rejection, and Wide-Band Microstrip Bandpass Filters, ” IEEE Trans. Microw. Theory Tech., vol. 51, no. 4, pp. 1241-1246, April 2003.
5. Wideband Microstrip Ring Resonator Bandpass Filters Under Multiple Resonances