Wed, 09 Jul 2008 13:39:13 BST CiteULike: dcastros Williams http://www.citeulike.org/user/dcastro/author/Williams CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/2774792 <i>Antennas and Propagation, IEEE Transactions on, Vol. 49, No. 1. (2001), pp. 45-47.</i><br /><br />The impedance of a rectangular patch antenna fed by an inset microstrip transmission line was measured for various feed positions. The dependence found was then compared to theoretical predictions both for this geometry and for the similar case of an inset coaxial probe feed The dependence of the input impedance on feed position of probe and microstrip line-fed patch antennas LI Basilio MA Khayat JT Williams SA Long doi:10.1109/8.910528 Antennas and Propagation, IEEE Transactions on, Vol. 49, No. 1. (2001), pp. 45-47. 2008-05-09T08:44:04-00:00 2001 Antennas and Propagation, IEEE Transactions on 49 1 45 47 antenna impedance input microstrip patch http://www.citeulike.org/user/dcastro/article/2774764 <i>Communications and Signal Processing, 1998. COMSIG '98. Proceedings of the 1998 South African Symposium on (1998), pp. 373-378.</i><br /><br />This paper presents an overview of the use of the HP-EESof Communications Design Suite software and the finite-difference time-domain (FDTD) method for the analysis of an active microstrip patch array. The use of frequency- and time-domain simulation algorithms for the prediction of free-running and injection-locked oscillators is discussed. The modelling of the passive radiating part of the antenna using the FDTD method is covered. Free-running oscillators are shown to be handled accurately and efficiently using the harmonic-balance algorithm, but injection-locked oscillators are a source of difficulty. The FDTD method, when compared to measurements, gives good results for the input impedance and mutual coupling of the passive array An overview of the modelling of an active microstrip patch array K Williams HC Reader DB Davidson doi:10.1109/COMSIG.1998.736985 Communications and Signal Processing, 1998. COMSIG '98. Proceedings of the 1998 South African Symposium on (1998), pp. 373-378. 2008-05-09T08:35:37-00:00 1998 Communications and Signal Processing, 1998. COMSIG '98. Proceedings of the 1998 South African Symposium on 373 378 active antenna array model patch http://www.citeulike.org/user/dcastro/article/2774534 <i>Antennas and Propagation, 1995., Ninth International Conference on (Conf. Publ. No. 407) (1995), pp. 175-178 vol.1.</i><br /><br />The design and modelling of an oscillator for use with a hypothetical patch antenna is investigated. The availability of an accurate model for the MRF136 MOSFET prompted the choice of 280 MHz as a convenient operating frequency. To facilitate time domain measurements, a second oscillator at 100 MHz was designed Nonlinear modelling of 1 watt active patch antenna HC Reader K Williams GA Hoile Antennas and Propagation, 1995., Ninth International Conference on (Conf. Publ. No. 407) (1995), pp. 175-178 vol.1. 2008-05-09T06:48:13-00:00 1995 Antennas and Propagation, 1995., Ninth International Conference on (Conf. Publ. No. 407) 175 178 vol.1 active antenna high nonlinear patch power http://www.citeulike.org/user/dcastro/article/2187927 <i>Antennas and Propagation, IEEE Transactions on, Vol. 55, No. 8. (2007), pp. 2358-2366.</i><br /><br />A new Global Positioning System (GPS) microstrip patch antenna designed for dual-band (LI /L2) operation is introduced. The antenna design is based on the reduced-surface-wave (RSW) concept and, as a result, is much less susceptible to low-angle multipath interference effects than some of the more commonly-used high-precision GPS antennas. In this paper, the radiation characteristics of this new design was compared to a dual- band choke-ring and a dual-band pinwheel antenna. In addition to having the advantages typically associated with microstrip patch antennas, this planar dual-band antenna lacks the design complications associated with the frequently-used stacked-patch method for realizing dual-band microstrip antenna performance. Thus, the simplicity of the design, together with the reduced horizon and backside radiation levels and excellent circular polarization characteristics indicate that this new antenna design is a promising candidate for dual-band, high-precision applications. A New Planar Dual-Band GPS Antenna Designed for Reduced Susceptibility to Low-Angle Multipath LI Basilio RL Chen JT Williams DR Jackson doi:10.1109/TAP.2007.901818 Antennas and Propagation, IEEE Transactions on, Vol. 55, No. 8. (2007), pp. 2358-2366. 2008-01-02T12:17:22-00:00 2007 Antennas and Propagation, IEEE Transactions on 55 8 2358 2366 antenna dual-band gps multipath planar http://www.citeulike.org/user/dcastro/article/2183855 <i>Antennas and Propagation Society International Symposium, 2000. IEEE, Vol. 2 (2000), pp. 528-529 vol.2.</i><br /><br />This paper reviews the use of large deployable mesh reflectors in communications satellites. The requirements of large reflectors are discussed. Several design concepts and implementations on a number of satellites are presented Large deployable antennas for satellite communications Y Rahmat-Samii AI Zaghloul AE Williams doi:10.1109/APS.2000.875191 Antennas and Propagation Society International Symposium, 2000. IEEE, Vol. 2 (2000), pp. 528-529 vol.2. 2007-12-31T18:14:48-00:00 2000 Antennas and Propagation Society International Symposium, 2000. IEEE 2 528 529 vol.2 antenna communications satellite