active microwave metamaterials incorporating ideal gain devices主动式微波超材料的理想设备.pdfVIP

Materials 2011, 4, 73-83; doi:10.3390/ma4010073 OPEN ACCESS materials ISSN 1996-1944 /journal/materials Article Active Microwave Metamaterials Incorporating Ideal Gain Devices Li-Ming Si 1,3, Tao Jiang 2,3, Kihun Chang 3, Te-Chuan Chen 3, Xin Lv 1, Lixin Ran 2 and Hao Xin 3,* 1 Department of Electronic Engineering, School of Information and Electronics, Beijing Institute of Technology, Beijing 10081, China; E-Mails: siliming@ (L.M.S.); lvxin@ (X.L.) 2 Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China; E-Mails: jtzju@126.com (T.J.); ranlx@ (L.R.) 3 Electrical and Computer Engineering Department, University of Arizona, Tucson, AZ 85721, USA; E-Mail: changkh@ (K.C.) * Author to whom correspondence should be addressed; E-Mail: hxin@; Tel.: +1-520-626-6941; Fax: +1-520-621-8076. Received: 29 November 2010; in revised form: 15 December 2010 / Accepted: 24 December 2010 / Published: 29 December 2010 Abstract: Incorporation of active devices/media such as transistors for microwave and gain media for optics may be very attractive for enabling desired low loss and broadband metamaterials. Such metamaterials can even have gain which may very well lead to new and exciting physical phenomena. We investigate microwave composite right/left-handed transmission lines (CRLH-TL) incorporating ideal gain devices such as constant negative resistance. With realistic lumped element values, we have shown that the negative phase constant of this kind of transmission lines is maintain