Group delay flatness and bandwidth enhancement of wideband negative group delay microwave circuit

International Journal of RF and Microwave Computer-Aided EngineeringVolume 30, Issue 12 e22443 RESEARCH ARTICLE Group delay flatness and bandwidth enhancement of wideband negative group delay microwave circuit Yuwei Meng, School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, ChinaSearch for more papers by this authorZhongbao Wang, Corresponding Author wangzb@dlmu.edu.cn orcid.org/0000-0003-4665-124X School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, China Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore Correspondence Zhongbao Wang, School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning 116026, China. Email: wangzb@dlmu.edu.cnSearch for more papers by this authorShaojun Fang, School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, ChinaSearch for more papers by this authorTe Shao, School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, ChinaSearch for more papers by this authorHongmei Liu, orcid.org/0000-0002-3834-4533 School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, ChinaSearch for more papers by this authorZhi Ning Chen, Department of Electrical and Computer Engineering, National University of Singapore, Singapore, SingaporeSearch for more papers by this author Yuwei Meng, School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, ChinaSearch for more papers by this authorZhongbao Wang, Corresponding Author wangzb@dlmu.edu.cn orcid.org/0000-0003-4665-124X School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, China Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore Correspondence Zhongbao Wang, School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning 116026, China. Email: wangzb@dlmu.edu.cnSearch for more papers by this authorShaojun Fang, School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, ChinaSearch for more papers by this authorTe Shao, School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, ChinaSearch for more papers by this authorHongmei Liu, orcid.org/0000-0002-3834-4533 School of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, ChinaSearch for more papers by this authorZhi Ning Chen, Department of Electrical and Computer Engineering, National University of Singapore, Singapore, SingaporeSearch for more papers by this author First published: 16 September 2020 https://doi.org/10.1002/mmce.22443 Funding information: National Natural Science Foundation of China, Grant/Award Numbers: 61871417, 51809030; Natural Science Foundation of Liaoning Province, Grant/Award Numbers: 2019-MS-024, 2020-MS-127; Fundamental Research Funds for the Central Universities, Grant/Award Numbers: 3132020206, 3132020207 Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinked InRedditWechat Abstract A wideband negative group delay (NGD) microwave circuit with group delay flatness and bandwidth enhancement is proposed. The proposed negative group delay circuit (NGDC) is composed of a resistor connected by two transmission lines and a parallel branch consisted of a resistor linking with a stepped-impedance transmission line and two open stubs. By tuning the characteristic impedance of the transmission lines, the flat-NGD bandwidth is enhanced. For verification, an NGDC with a size of 0.24λg × 0.34λg is designed, fabricated, and measured. The measurement shows that an NGD time of −0.5 ns at the center frequency of 1.0 GHz is obtained with the NGD bandwidth of 68.6% over 0.668 to 1.365 GHz. Also, the flat-NGD bandwidth reaches 46.3% or 0.776 to 1.243 GHz with ±8% group-delay fluctuation while the insertion loss is less than 18.8 dB and return loss is greater than 21 dB. Volume30, Issue12December 2020e22443 RelatedInformation