CiteULike: dcastro's York http://www.citeulike.org/user/dcastro/author/York CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2782042 <i>Microwave Symposium Digest., 2000 IEEE MTT-S International, Vol. 1 (2000), pp. 593-596 vol.1.</i><br /><br />This paper describes the analysis, design, implementation and characterization of a computer-controlled system that accurately measures the phase and amplitude distributions of a phased antenna array. The proposed setup allows `on board' measurements and far field radiation pattern collection at the same time. We have measured the phase and amplitude distributions of a coupled oscillator array at 2.4-2.6 GHz. The results are coherent with the theoretical expectations. The amplitude error is less than 5% and the phase error is less than 5°. This simple and inexpensive measurement system can be used for automated diagnostics of linear and nonlinear antenna arrays Measurement of the phase and amplitude distributions of coupled oscillator arrays PF Maccarini TP Dao AS Nagra A Borgioli RA York doi:10.1109/MWSYM.2000.861137 Microwave Symposium Digest., 2000 IEEE MTT-S International, Vol. 1 (2000), pp. 593-596 vol.1. 2008-05-09T23:55:44-00:00 Microwave Symposium Digest., 2000 IEEE MTT-S International 1 593 596 vol.1 array measurement oscillator phase http://www.citeulike.org/user/dcastro/article/2782037 <i>Microwave Magazine, IEEE, Vol. 1, No. 4. (2000), pp. 48-59.</i><br /><br />This article surveys recent progress in the development of high-power microwave and millimeter-wave solid-state sources using spatial power-combining techniques. Several promising topologies are discussed, and four technology demonstrations are presented that have emerged from recent research in academia and industry. We also include a brief discussion of potential applications and systems insertion issues Spatial power combining for high-power transmitters J Harvey ER Brown DB Rutledge RA York doi:10.1109/6668.893246 Microwave Magazine, IEEE, Vol. 1, No. 4. (2000), pp. 48-59. 2008-05-09T23:51:39-00:00 Microwave Magazine, IEEE 1 4 48 59 power transmitter http://www.citeulike.org/user/dcastro/article/2782034 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 49, No. 2. (2001), pp. 237-249.</i><br /><br />The ability of two coupled oscillators to synchronize depends critically on the coupling network. Previous analyses have accurately predicted the performance of quasi-optical microwave oscillator arrays for both weak and strong coupling, but have been limited to coupling networks with bandwidths considerably larger than the locking bandwidths of the oscillators. In this paper, the authors develop a method for deriving a suitable system of nonlinear differential equations describing the oscillator amplitude and phase dynamics using a generalization of Kurokawa's method. The method is applied to the case of two Van der Pol oscillators coupled through a resonant network for a wide range of coupling strengths and bandwidths. Simple approximate formulas are developed for the size of the frequency locking region as functions of the basic circuit parameters Synchronization of oscillators coupled through narrow-band networks JJ Lynch RA York doi:10.1109/22.903084 Microwave Theory and Techniques, IEEE Transactions on, Vol. 49, No. 2. (2001), pp. 237-249. 2008-05-09T23:51:28-00:00 Microwave Theory and Techniques, IEEE Transactions on 49 2 237 249 oscillator synchronization http://www.citeulike.org/user/dcastro/article/2776282 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 49, No. 8. (2001), pp. 1477-1482.</i><br /><br />This paper examines some relationships between important design parameters in large combiner systems and key performance objectives such as power, efficiency, noise, and graceful degradation. Results are derived for the combining efficiency of general combiner systems, and used to contrast spatial and corporate combiners and identify optimum combiner topology for a given device technology. The influence of array size on excess phase noise is quantified and shown to decrease with increase numbers of devices. Results are also presented for the degradation in combining efficiency due to statistical variations in amplifier characteristics, appropriate to large combiners, showing that phase errors are the dominant factor in power degradation Some considerations for optimal efficiency and low noise in large power combiners RA York doi:10.1109/22.939929 Microwave Theory and Techniques, IEEE Transactions on, Vol. 49, No. 8. (2001), pp. 1477-1482. 2008-05-09T16:41:57-00:00 Microwave Theory and Techniques, IEEE Transactions on 49 8 1477 1482 microwave noise power http://www.citeulike.org/user/dcastro/article/2774503 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 46, No. 11. (1998), pp. 1920-1929.</i><br /><br />Applications of millimeter-wave radar, imaging, and communication technology requires cost-effective implementation of intelligent scanning antenna systems. Injection-locking and phase-locked-loop (PLL) techniques can be used to achieve synchronous operation of a number of antenna array elements, and allow for the manipulation of the phase distribution without additional phase-shifting circuitry, suggesting a potential for low-cost beam-scanning systems. This paper describes a number of techniques, with an assessment of some remaining technical challenges for practical implementation Injection- and phase-locking techniques for beam control [antenna arrays] RA York T Itoh doi:10.1109/22.734513 Microwave Theory and Techniques, IEEE Transactions on, Vol. 46, No. 11. (1998), pp. 1920-1929. 2008-05-09T06:40:42-00:00 Microwave Theory and Techniques, IEEE Transactions on 46 11 1920 1929 active antenna array beam control pll http://www.citeulike.org/user/dcastro/article/2755519 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 50, No. 3. (2002), pp. 937-944.</i><br /><br />This paper provide a review of the active integrated antenna (AIA) technologies. After a brief introduction on the definition and some historical remarks, the paper concentrates on the research effort on the past decades or so. The AlAs are reviewed in its various functions. First, an oscillator-type AIA is presented, followed by very interesting aspects of coupled oscillator arrays for phase control. Use of an AIA concept for efficient RF front ends is described with examples on high-power amplifier AlAs. Next, a phase-conjugation-based retrodirective array is reviewed. Finally, AIA systems for receiving, transmitting, and duplexing are reviewed Active integrated antennas K Chang York PS Hall T Itoh doi:10.1109/22.989976 Microwave Theory and Techniques, IEEE Transactions on, Vol. 50, No. 3. (2002), pp. 937-944. 2008-05-05T07:59:39-00:00 Microwave Theory and Techniques, IEEE Transactions on 50 3 937 944 active antenna integrated