Sun, 06 Jul 2008 11:04:37 BST CiteULike: dcastros Fredrick http://www.citeulike.org/user/dcastro/author/Fredrick CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2758007 <i>Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2001. TELSIKS 2001. 5th International Conference on, Vol. 1 (2001), pp. 3-9 vol.1.</i><br /><br />Several developments in RF front end technology based upon the active antenna concept are presented. RF front ends utilizing active antenna concepts have shown improvements in such areas as power added efficiency, compactness, low noise figure, and increased functionality. These improvements are illustrated with a Class F power amplifier transmitter with an integrated circular patch antenna, a circularly polarized patch antenna with integrated LNAs, a 60 GHz quasi-optics self oscillating mixer, and two designs implementing the recently developed broadband quasi-Yagi antenna Recent developments in RF front ends based upon active antenna concepts JD Fredrick T Itoh doi:10.1109/TELSKS.2001.954838 Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2001. TELSIKS 2001. 5th International Conference on, Vol. 1 (2001), pp. 3-9 vol.1. 2008-05-05T14:11:19-00:00 2001 Telecommunications in Modern Satellite, Cable and Broadcasting Service, 2001. TELSIKS 2001. 5th International Conference on 1 3 9 vol.1 active antenna rf http://www.citeulike.org/user/dcastro/article/2421341 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 50, No. 12. (2002), pp. 3052-3058.</i><br /><br />A new type of smart antenna array receiver with adaptive beamforming is proposed. The novel system offers a drastic reduction in hardware requirements for the smart antenna system through the use of a new Spatial Multiplexing of Local Elements (SMILE) scheme. In this scheme, a single element of the array is sequentially connected to signal processing circuitry in order to sample the incoming modulated carrier. The sampling rate is higher than the signal bandwidth so that the information of the original signal can be fully restored in the post stages using low-pass filters. This system offers an N times reduction in RF hardware for an N-element array. A four-element prototype is built. System principles, SNR, advantages, and hardware, including a new type of array feed network, are discussed. The system performance is validated through a link test with digitally modulated data. A smart antenna receiver array using a single RF channel and digital beamforming JD Fredrick Yuanxun Wang T Itoh doi:10.1109/TMTT.2002.805150 Microwave Theory and Techniques, IEEE Transactions on, Vol. 50, No. 12. (2002), pp. 3052-3058. 2008-02-24T12:58:53-00:00 2002 Microwave Theory and Techniques, IEEE Transactions on 50 12 3052 3058 antenna array beamformer digital receiver smart