Federal Communications Commission, Revision of part 15 of the Commission’s rules regarding ultra-wideband transmission systems, Tech. Rep., ET-Docket 98-153, FCC02-48, April, 2002.
 D. Jung, J. Lee, and K. Chang, “Wideband Bandpass Filter Using Microstrip Ring,” Microwave and Optical Technology Letters, vol. 53, no. 1, January, 2011.
 Z. Ma, W. He, C. Chen, Y. Kobayashi, and T. Anada, “A Novel Compact Ultra-Wideband Bandpass Using Stub-Loaded Dual-Mode Resonator Doublets,” in Microwave Symposium Digest (IMS) Proc., pp. 435-438, 26 September, 2008.
 L. Zhu, K. Wu, A joint field/circuit model of line-to-ring coupling structures and its application to the design of microstrip dual-mode filters and ring resonator circuits, IEEE Trans. Microwave Theory Tech. 47 (10), pp. 1938–1948, 1999.
 L.H. Hsieh, K. Chang, Dual-mode quasi-elliptic-function bandpass filters using ring resonators with enhanced-coupling tuning stubs, IEEE Trans. Microwave Theory Tech. 50 (5), pp. 1340–1345, 2002.
 S. Sun, L. Zhu, Wideband microstrip ring resonator bandpass filters under multiple resonances, IEEE Trans. Microwave Theory Tech. 55 (10), pp. 2176–2182, 2007.
 C.H. Kim, K. Chang, Ultra-wideband (UWB) ring resonator bandpass filter with a notched band, IEEE Microwave Wireless Compon. Lett. 21 (4), pp. 206–208, 2011.
 C. H. Kim and K. Chang, “Ring resonator bandpass filter with switchable bandwidth using stepped-impedance stubs,” IEEE Trans. Microw. Theory Tech., vol. 58, no. 12, pp. 3936–3944, December, 2010.
 A. Nakhlestani, A. Hakimi “Wideband microstrip ring resonator bandpass filter with embedded rings” Microelectronics Journal, no.5, pp. 462-467, 2013.
 R. Marque’s, F. Martin and M. Sorolla, Metamaterials with Negative Parameters, First Edition, John Wiley Co., 2006.
 M. Gil, J. Bonache, J. Garcia-Garcia, J. Martel, and F. Martin “Composite right/left handed (CRLH) metamaterial transmission lines based on complementary split rings resonators (CSRRs) and their Applications to very wide band and compact filter design.” IEEE Trans. Microwave Theory Tech., vol. 55, pp. 1296–1304, June, 2007.
 Bonache J, Martin F, Garcia‐Garcia J, Gil I, Marques R, Sorolla M. Ultra-wide band pass filters (UWBPF) based on complementary split rings resonators. Microwave and optical technology letters. 5; 46(3):283-6, Aug, 2005.
 M. Gil, J. Bonache, and F. Martin “Metamaterial filters with attenuation poles in the pass band for ultra-wide band applications” Microwave Opt. Tech. Lett., vol. 49, pp. 2909–2913, December, 2007.
 Tu WH. Sharp-rejection broadband microstrip bandpass filter using penta-mode resonator. Group. 27; 1(2.0):2-4, May, 2010.
 P. Mondal, M. Mandal, A. Chakrabarty, “Compact Ultra-Wideband Bandpass Filter with Improved Upper Stopband,” IEEE Microwave and Wireless Components Letter, vol. 17, No.9, September, 2007.
 D. Chen, X. D. Huang, and C. H. Cheng, “A Novel Compact Ultra-Wideband (UWB) Bandpass Filter Using Multiple-Mode Resonator,” Microwave And Optical Technology Letters, vol. 51, No.7, July, 2009.
 H. H. Hu, Z. Y. Xiao, W. Q. He and S. Gao “Novel Compact Ultra-Wideband Filter with Wide Stop Band,” Microwave and Optical Technology Letters, vol. 51, No.1, January, 2009.
 Zhewang Ma, H. Sasaki, Ch.P. Chen, T. Anada, and Y. Kobayashi, “Design of a Wideband Bandpass Filter Using Microstrip Parallel- Coupled Dual-Mode Ring Resonator” Asia-Pacific Microwave Conference Proceedings, pp. 21-24, December, 2010.
 P. Cai, Z. Ma, X. Guan, Y. Kobayashi and T. Anada, “Novel Compact microstrip dual-mode ring resonator wideband Bandpass filter with significantly improved stopband property,” IEICE Trans Electron., no. 12, pp. 1858-1864, December, 2006.
 He Zhu , Qing-Xin Chu, “Compact Ultra-Wideband (UWB) Bandpass Filter Using Dual-Stub-Loaded Resonator (DSLR),” IEEE Microwave and Wireless Components Letter vol. 23, No.10, October, 2013.
 Pozar, David M. "Microwave Engineering, copyright 2012 by John Wiley & Sons." 422-426.
 Ishida, H., & Araki, K. “Design and analysis of UWB bandpass filter with ring filter,” IEEE MTT-S Int. Dig., no. 3, pp. 1307–1310, 2004.
 Q. X. Chu, X. H. Wu, and X. K. Tian, “Novel UWB bandpass filter Using stub-loaded multiple-mode resonator,” IEEE Microwave Wireless Components Letters, vol. 21, no. 8, pp. 403–405, Aug, 2011.
 Wu, H. W., Chen, Y. W., & Chen, Y. F. “New ultra-wideband (UWB) bandpass filter using triangle-ring multi-mode stub-loaded resonator,” Microelectronics Journal, vol. 43, no. 11, pp. 857–862, November, 2012.
J. S. Hong, Microstrip Filters for RF/Microwave Application, 2nd Edition, John Wiley & Sons, Inc., 2011.
 Sahin EG, Gorur AK, Karpuz C, Gorur A. Design of UWB microstrip bandpass filter using stub‐loaded quintuple‐mode resonator. Microwave and Optical Technology Letters. pp. 662-666, Mar, 2016.
 Lu X, Wei B, Xu Z, Cao B, Guo X, Zhang X, Wang R, Song F. “Superconducting Ultra-Wideband (UWB) Bandpass Filter Design Based on Quintuple/Quadruple/Triple-Mode Resonator.” Microwave Theory and Techniques, IEEE Transactions on, pp. 1281-1293, Apr, 2015.