Thu, 24 Jul 2008 23:23:53 BST CiteULike: dcastros balun http://www.citeulike.org/user/dcastro/tag/balun CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2809072 <i>Microwave Conference, 2007. European (2007), pp. 466-469.</i><br /><br />In this paper, a broadband balun using an active circuit with negative group delay (NGD) is proposed. The unit cell of the active NGD circuit is based on a Field Effect Transistor (FET) in cascade with an RLC series network. First, a comparison between measurements of a two-stage prototype of this active topology and simulations validate the synthesis method of this innovative device. Then, thanks to the NGD circuit, a constant phase can be generated if this circuit is associated with a classical transmission line. By implementing such phase shifters into the two branches of a resistive splitter, we obtain a new balun topology. The NGD balun simulation results show a rather constant differential output phase (180degplusmn9deg), insertion losses above -2.4 dB and an excellent isolation below -59 dB for all three ports, for a bandwidth from 3.5 GHz to 5.5 GHz. Broadband balun using active negative group delay circuit B Ravelo A Perennec M Le Roy doi:10.1109/EUMC.2007.4405228 Microwave Conference, 2007. European (2007), pp. 466-469. 2008-05-18T14:07:40-00:00 2007 Microwave Conference, 2007. European 466 469 active balun broadband metamaterial http://www.citeulike.org/user/dcastro/article/2808917 <i>PROCEEDINGS OF ISAP2005 (2005)</i> A Novel Design of Balun using Left-Handed Transmission Line Seungjun Lee Jong-Sik Lim Hoe-Sung Yang Sangwook Nam PROCEEDINGS OF ISAP2005 (2005) 2008-05-18T12:24:35-00:00 2005 PROCEEDINGS OF ISAP2005 balun crlh metamaterial tl http://www.citeulike.org/user/dcastro/article/2805159 <i>Microwave Conference, 2005 European, Vol. 1 (2005), 4 pp..</i><br /><br />This paper reports on the design of a novel LC balun based on a replacement circuit of right-handed (RH) and left-handed transmission lines in combination. This approach gives a very simple balun structure with excellent broadband performance. The balun is designed for WLAN applications in the 5 GHz ISM band. Concept of the balun, simulation, realisation and measurement results are presented. A simple LTCC balun for WLAN applications using left-handed (LH) transmission lines (TL) K Markov S Royak G Sevskiy P Heide doi:10.1109/EUMC.2005.1608813 Microwave Conference, 2005 European, Vol. 1 (2005), 4 pp.. 2008-05-16T12:02:17-00:00 2005 Microwave Conference, 2005 European 1 4 pp. balun crlh lh metamaterial tl wlan http://www.citeulike.org/user/dcastro/article/2762240 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 39, No. 12. (1991), pp. 1980-1986.</i><br /><br />The design and fabrication of four broadband monolithic passive baluns including CPW Marchand, multilayer MS Marchand, planar-transformer and broadside-coupled line baluns are presented. Operational frequencies range from 1.5 GHz to 24 GHz. Maximum relative bandwidths in excess of 3:1 are achieved. Simulated performances using full wave electromagnetic analysis are shown to agree with the measured results. Two accurate equivalent circuit models constructed from either electromagnetic simulated or measured S-parameters are developed for the MS Marchand and transformer baluns making the optimization of baluns and circuit design using the baluns much more efficient. The design of monolithic double-balanced diode mixer using two planar-transformer baluns is also presented. Without DC bias, the mixer shows a minimum conversion loss of 6 dB with the RF at 5 GHz and a LO drive of 15 dBm at 4 GHz. The measured input IP₃ of this mixer is better than 15 dBm over the 4 to 5.75 GHz frequency band Broadband monolithic passive baluns and monolithic double-balanced mixer Chen KW Chang SB Bui H Wang GS Dow LCT Liu TS Lin WS Titus doi:10.1109/22.106536 Microwave Theory and Techniques, IEEE Transactions on, Vol. 39, No. 12. (1991), pp. 1980-1986. 2008-05-06T18:33:19-00:00 1991 Microwave Theory and Techniques, IEEE Transactions on 39 12 1980 1986 balanced balun broadband mixer passive